<html><head><meta http-equiv="Content-Type" content="text/html charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><br class=""><div class="">
<span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Helvetica; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-align: -webkit-auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; "><div class=""><div class="">---------</div><div class="">Curtis A. Meyer<span class="Apple-tab-span" style="white-space: pre; "> </span>MCS Associate Dean for Faculty and Graduate Affairs</div><div class="">Wean: (412) 268-2745<span class="Apple-tab-span" style="white-space: pre; "> </span>Professor of Physics</div><div class="">Doherty: (412) 268-3090<span class="Apple-tab-span" style="white-space: pre; "> </span>Carnegie Mellon University</div><div class="">Fax: (412) 681-0648<span class="Apple-tab-span" style="white-space: pre; "> </span>Pittsburgh, PA 15213</div><div class=""><a href="mailto:curtis.meyer@cmu.edu" class="">curtis.meyer@cmu.edu</a><span class="Apple-tab-span" style="white-space: pre; "> </span>http://www.curtismeyer.com/</div></div><div class=""><br class=""></div></span><br class="Apple-interchange-newline">
</div>
<div style=""><br class=""><blockquote type="cite" class=""><div class="">Begin forwarded message:</div><br class="Apple-interchange-newline"><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px;" class=""><span style="font-family: -webkit-system-font, Helvetica Neue, Helvetica, sans-serif; color:rgba(0, 0, 0, 1.0);" class=""><b class="">From: </b></span><span style="font-family: -webkit-system-font, Helvetica Neue, Helvetica, sans-serif;" class="">Barry Ritchie <<a href="mailto:Barry.Ritchie@asu.edu" class="">Barry.Ritchie@asu.edu</a>><br class=""></span></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px;" class=""><span style="font-family: -webkit-system-font, Helvetica Neue, Helvetica, sans-serif; color:rgba(0, 0, 0, 1.0);" class=""><b class="">Subject: </b></span><span style="font-family: -webkit-system-font, Helvetica Neue, Helvetica, sans-serif;" class=""><b class="">RE: [Halld-offline] Beam Polarization</b><br class=""></span></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px;" class=""><span style="font-family: -webkit-system-font, Helvetica Neue, Helvetica, sans-serif; color:rgba(0, 0, 0, 1.0);" class=""><b class="">Date: </b></span><span style="font-family: -webkit-system-font, Helvetica Neue, Helvetica, sans-serif;" class="">February 29, 2016 at 9:43:09 PM EST<br class=""></span></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px;" class=""><span style="font-family: -webkit-system-font, Helvetica Neue, Helvetica, sans-serif; color:rgba(0, 0, 0, 1.0);" class=""><b class="">To: </b></span><span style="font-family: -webkit-system-font, Helvetica Neue, Helvetica, sans-serif;" class="">"Curtis A. Meyer" <<a href="mailto:cmeyer@cmu.edu" class="">cmeyer@cmu.edu</a>>, Nathan Sparks <<a href="mailto:nsparks@jlab.org" class="">nsparks@jlab.org</a>><br class=""></span></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px;" class=""><span style="font-family: -webkit-system-font, Helvetica Neue, Helvetica, sans-serif; color:rgba(0, 0, 0, 1.0);" class=""><b class="">Cc: </b></span><span style="font-family: -webkit-system-font, Helvetica Neue, Helvetica, sans-serif;" class="">Paul Mattione <<a href="mailto:pmatt@jlab.org" class="">pmatt@jlab.org</a>>, GlueX Offline Software Email List <<a href="mailto:HallD-Offline@jlab.org" class="">HallD-Offline@jlab.org</a>>, Livingston Ken <<a href="mailto:Kenneth.Livingston@glasgow.ac.uk" class="">Kenneth.Livingston@glasgow.ac.uk</a>>, Michael Dugger <<a href="mailto:dugger@jlab.org" class="">dugger@jlab.org</a>><br class=""></span></div><br class=""><div class=""><div class="WordSection1" style="page: WordSection1; font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;"><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="font-size: 12pt; font-family: 'Times New Roman', serif; color: rgb(50, 62, 79);" class="">Also I see that I am not permitted to send to the GlueX Software Email List, so someone with privileges might want to pass my notes along. Thanks. ---BGR<o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="font-size: 12pt; font-family: 'Times New Roman', serif; color: rgb(50, 62, 79);" class=""><o:p class=""> </o:p></span></div><div class=""><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><b class=""><span style="font-size: 12pt; font-family: 'Book Antiqua', serif; color: blue;" class="">Barry G. Ritchie<span class="Apple-converted-space"> </span><br class="">Senior Advisor to the Provost<span class="Apple-converted-space"> </span><br class="">Arizona State University<span class="Apple-converted-space"> </span><br class="">300 E. University Ave, Suite 420<span class="Apple-converted-space"> </span><br class="">Tempe, AZ 85287-7805<span class="Apple-converted-space"> </span></span></b><b class=""><span style="font-size: 12pt; font-family: 'Book Antiqua', serif; color: rgb(31, 73, 125);" class=""><o:p class=""></o:p></span></b></div><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><b class=""><span style="font-size: 12pt; font-family: 'Book Antiqua', serif; color: rgb(31, 73, 125);" class=""> <o:p class=""></o:p></span></b></div><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><b class=""><span style="font-size: 12pt; font-family: 'Book Antiqua', serif; color: blue;" class="">Phone: (480) 965-1464<span class="Apple-converted-space"> </span><br class="">Fax: (480) 965-0785<o:p class=""></o:p></span></b></div></div><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="font-size: 12pt; font-family: 'Times New Roman', serif; color: rgb(50, 62, 79);" class=""><o:p class=""> </o:p></span></div><div class=""><div style="border-style: solid none none; border-top-color: rgb(225, 225, 225); border-top-width: 1pt; padding: 3pt 0in 0in;" class=""><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><b class="">From:</b><span class="Apple-converted-space"> </span>Barry Ritchie<span class="Apple-converted-space"> </span><br class=""><b class="">Sent:</b><span class="Apple-converted-space"> </span>Monday, February 29, 2016 7:42 PM<br class=""><b class="">To:</b><span class="Apple-converted-space"> </span>Curtis A. Meyer <<a href="mailto:cmeyer@cmu.edu" style="color: rgb(149, 79, 114); text-decoration: underline;" class="">cmeyer@cmu.edu</a>>; Nathan Sparks <<a href="mailto:nsparks@jlab.org" style="color: rgb(149, 79, 114); text-decoration: underline;" class="">nsparks@jlab.org</a>><br class=""><b class="">Cc:</b><span class="Apple-converted-space"> </span>Paul Mattione <<a href="mailto:pmatt@jlab.org" style="color: rgb(149, 79, 114); text-decoration: underline;" class="">pmatt@jlab.org</a>>; GlueX Offline Software Email List <<a href="mailto:HallD-Offline@jlab.org" style="color: rgb(149, 79, 114); text-decoration: underline;" class="">HallD-Offline@jlab.org</a>>; Livingston Ken <<a href="mailto:Kenneth.Livingston@glasgow.ac.uk" style="color: rgb(149, 79, 114); text-decoration: underline;" class="">Kenneth.Livingston@glasgow.ac.uk</a>>; Michael Dugger <<a href="mailto:dugger@jlab.org" style="color: rgb(149, 79, 114); text-decoration: underline;" class="">dugger@jlab.org</a>><br class=""><b class="">Subject:</b><span class="Apple-converted-space"> </span>RE: [Halld-offline] Beam Polarization<o:p class=""></o:p></div></div></div><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><o:p class=""> </o:p></div><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="font-size: 12pt; font-family: 'Times New Roman', serif; color: rgb(50, 62, 79);" class="">All that said, it’s probably not a bad idea to have a “place holder” for each method’s values for each bin for each run or subset of run files. When those values disagree, that might serve to indicate some experimental issues that need to be addressed during the offline data analysis.<o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="font-size: 12pt; font-family: 'Times New Roman', serif; color: rgb(50, 62, 79);" class=""><o:p class=""> </o:p></span></div><div class=""><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><b class=""><span style="font-size: 12pt; font-family: 'Book Antiqua', serif; color: blue;" class="">Barry G. Ritchie<span class="Apple-converted-space"> </span><br class="">Senior Advisor to the Provost<span class="Apple-converted-space"> </span><br class="">Arizona State University<span class="Apple-converted-space"> </span><br class="">300 E. University Ave, Suite 420<span class="Apple-converted-space"> </span><br class="">Tempe, AZ 85287-7805<span class="Apple-converted-space"> </span></span></b><b class=""><span style="font-size: 12pt; font-family: 'Book Antiqua', serif; color: rgb(31, 73, 125);" class=""><o:p class=""></o:p></span></b></div><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><b class=""><span style="font-size: 12pt; font-family: 'Book Antiqua', serif; color: rgb(31, 73, 125);" class=""> <o:p class=""></o:p></span></b></div><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><b class=""><span style="font-size: 12pt; font-family: 'Book Antiqua', serif; color: blue;" class="">Phone: (480) 965-1464<span class="Apple-converted-space"> </span><br class="">Fax: (480) 965-0785<o:p class=""></o:p></span></b></div></div><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="font-size: 12pt; font-family: 'Times New Roman', serif; color: rgb(50, 62, 79);" class=""><o:p class=""> </o:p></span></div><div class=""><div style="border-style: solid none none; border-top-color: rgb(225, 225, 225); border-top-width: 1pt; padding: 3pt 0in 0in;" class=""><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><b class="">From:</b><span class="Apple-converted-space"> </span>Barry Ritchie<span class="Apple-converted-space"> </span><br class=""><b class="">Sent:</b><span class="Apple-converted-space"> </span>Monday, February 29, 2016 7:37 PM<br class=""><b class="">To:</b><span class="Apple-converted-space"> </span>Curtis A. Meyer <<a href="mailto:cmeyer@cmu.edu" style="color: rgb(149, 79, 114); text-decoration: underline;" class="">cmeyer@cmu.edu</a>>; Nathan Sparks <<a href="mailto:nsparks@jlab.org" style="color: rgb(149, 79, 114); text-decoration: underline;" class="">nsparks@jlab.org</a>><br class=""><b class="">Cc:</b><span class="Apple-converted-space"> </span>Paul Mattione <<a href="mailto:pmatt@jlab.org" style="color: rgb(149, 79, 114); text-decoration: underline;" class="">pmatt@jlab.org</a>>; GlueX Offline Software Email List <<a href="mailto:HallD-Offline@jlab.org" style="color: rgb(149, 79, 114); text-decoration: underline;" class="">HallD-Offline@jlab.org</a>>; Livingston Ken <<a href="mailto:Kenneth.Livingston@glasgow.ac.uk" style="color: rgb(149, 79, 114); text-decoration: underline;" class="">Kenneth.Livingston@glasgow.ac.uk</a>>; Michael Dugger <<a href="mailto:dugger@jlab.org" style="color: rgb(149, 79, 114); text-decoration: underline;" class="">dugger@jlab.org</a>><br class=""><b class="">Subject:</b><span class="Apple-converted-space"> </span>RE: [Halld-offline] Beam Polarization<o:p class=""></o:p></div></div></div><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><o:p class=""> </o:p></div><div class=""><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">Both methods of determining the beam polarization are retrospective and have to be based on reasonable statistics in each energy bin for a given run. Some variation in polarization is likely over the course of the run, so the analyses will not provide a “real” number for each run and each energy bin until the data for a particular run and bin are analyzed. ---BGR<o:p class=""></o:p></div><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""> <o:p class=""></o:p></div><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">Sent from<span class="Apple-converted-space"> </span><a href="https://go.microsoft.com/fwlink/?LinkId=550986" style="color: rgb(149, 79, 114); text-decoration: underline;" class="">Mail</a><span class="Apple-converted-space"> </span>for Windows 10<o:p class=""></o:p></div><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="font-size: 12pt; font-family: 'Times New Roman', serif;" class=""> </span><o:p class=""></o:p></div><div style="border-style: solid none none; border-top-color: rgb(225, 225, 225); border-top-width: 1pt; padding: 3pt 0in 0in;" class=""><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><b class="">From:<span class="Apple-converted-space"> </span></b><a href="mailto:cmeyer@cmu.edu" style="color: rgb(149, 79, 114); text-decoration: underline;" class="">Curtis A. Meyer</a><br class=""><b class="">Sent:<span class="Apple-converted-space"> </span></b>Monday, February 29, 2016 7:23 PM<br class=""><b class="">To:<span class="Apple-converted-space"> </span></b><a href="mailto:nsparks@jlab.org" style="color: rgb(149, 79, 114); text-decoration: underline;" class="">Nathan Sparks</a><br class=""><b class="">Cc:<span class="Apple-converted-space"> </span></b><a href="mailto:pmatt@jlab.org" style="color: rgb(149, 79, 114); text-decoration: underline;" class="">Paul Mattione</a>;<span class="Apple-converted-space"> </span><a href="mailto:HallD-Offline@jlab.org" style="color: rgb(149, 79, 114); text-decoration: underline;" class="">GlueX Offline Software Email List</a>;<span class="Apple-converted-space"> </span><a href="mailto:Kenneth.Livingston@glasgow.ac.uk" style="color: rgb(149, 79, 114); text-decoration: underline;" class="">Livingston Ken</a>;<span class="Apple-converted-space"> </span><a href="mailto:dugger@jlab.org" style="color: rgb(149, 79, 114); text-decoration: underline;" class="">Michael Dugger</a>;<span class="Apple-converted-space"> </span><a href="mailto:Barry.Ritchie@asu.edu" style="color: rgb(149, 79, 114); text-decoration: underline;" class="">Barry Ritchie</a><br class=""><b class="">Subject:<span class="Apple-converted-space"> </span></b>Re: [Halld-offline] Beam Polarization<o:p class=""></o:p></div></div><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="font-size: 12pt; font-family: 'Times New Roman', serif;" class=""> </span><o:p class=""></o:p></div></div><div class=""><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="font-size: 12pt; font-family: 'Times New Roman', serif;" class="">I think that all of the methods we have provide an estimate for the polarization for a given photon <o:p class=""></o:p></span></div><div class=""><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="font-size: 12pt; font-family: 'Times New Roman', serif;" class="">energy, and none of them are event-by-event. The knowledge that we gain from each of them <o:p class=""></o:p></span></div></div><div class=""><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="font-size: 12pt; font-family: 'Times New Roman', serif;" class="">has to be built into a function, that given a photon energy and an “event time”, can give us our<o:p class=""></o:p></span></div></div><div class=""><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="font-size: 12pt; font-family: 'Times New Roman', serif;" class="">best estimate of both P and the error in P.<o:p class=""></o:p></span></div></div><div class=""><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="font-size: 12pt; font-family: 'Times New Roman', serif;" class=""><o:p class=""> </o:p></span></div></div><div class=""><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="font-size: 12pt; font-family: 'Times New Roman', serif;" class="">Curtis<o:p class=""></o:p></span></div></div><div class=""><div class=""><div class=""><div class=""><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="font-size: 12pt; font-family: Helvetica, sans-serif;" class="">---------<o:p class=""></o:p></span></div></div><div class=""><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="font-size: 12pt; font-family: Helvetica, sans-serif;" class="">Curtis A. Meyer</span><span class="apple-tab-span"><o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="font-size: 12pt; font-family: Helvetica, sans-serif;" class="">MCS Associate Dean for Faculty and Graduate Affairs</span><o:p class=""></o:p></div></div><div class=""><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="font-size: 12pt; font-family: Helvetica, sans-serif;" class="">Wean: (412) 268-2745</span><span class="apple-tab-span"><o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="font-size: 12pt; font-family: Helvetica, sans-serif;" class="">Professor of Physics</span><o:p class=""></o:p></div></div><div class=""><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="font-size: 12pt; font-family: Helvetica, sans-serif;" class="">Doherty: (412) 268-3090</span><span class="apple-tab-span"><o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="font-size: 12pt; font-family: Helvetica, sans-serif;" class="">Carnegie Mellon University</span><o:p class=""></o:p></div></div><div class=""><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="font-size: 12pt; font-family: Helvetica, sans-serif;" class="">Fax: (412) 681-0648</span><span class="apple-tab-span"><o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="font-size: 12pt; font-family: Helvetica, sans-serif;" class="">Pittsburgh, PA 15213</span><o:p class=""></o:p></div></div><div class=""><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="font-size: 12pt; font-family: Helvetica, sans-serif;" class=""><a href="mailto:curtis.meyer@cmu.edu" style="color: rgb(149, 79, 114); text-decoration: underline;" class="">curtis.meyer@cmu.edu</a></span><span class="apple-tab-span"><o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="font-size: 12pt; font-family: Helvetica, sans-serif;" class=""><a href="http://www.curtismeyer.com/" style="color: rgb(149, 79, 114); text-decoration: underline;" class="">http://www.curtismeyer.com/</a></span><o:p class=""></o:p></div></div></div><div class=""><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="font-size: 12pt; font-family: Helvetica, sans-serif;" class=""><o:p class=""> </o:p></span></div></div><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="font-size: 12pt; font-family: 'Times New Roman', serif;" class=""><o:p class=""> </o:p></span></div></div><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="font-size: 12pt; font-family: 'Times New Roman', serif;" class=""><o:p class=""> </o:p></span></div><div class=""><blockquote style="margin-top: 5pt; margin-bottom: 5pt;" class=""><div class=""><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="font-size: 12pt; font-family: 'Times New Roman', serif;" class="">On Feb 29, 2016, at 9:16 PM, Nathan Sparks <<a href="mailto:nsparks@jlab.org" style="color: rgb(149, 79, 114); text-decoration: underline;" class="">nsparks@jlab.org</a>> wrote:<o:p class=""></o:p></span></div></div><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="font-size: 12pt; font-family: 'Times New Roman', serif;" class=""><o:p class=""> </o:p></span></div><div class=""><div class=""><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="font-size: 12pt; font-family: 'Times New Roman', serif;" class="">My understanding is that the triplet polarimeter measurement cannot give us a polarization number for each event.<o:p class=""></o:p></span></div><div class=""><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="font-size: 12pt; font-family: 'Times New Roman', serif;" class="">The procedure for extracting the polarization using the TPOL is similar to extracting the beam asymmetry (Sigma),<o:p class=""></o:p></span></div></div><div class=""><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="font-size: 12pt; font-family: 'Times New Roman', serif;" class="">except in this you know Sigma instead of P:<o:p class=""></o:p></span></div></div><div class=""><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="font-size: 12pt; font-family: 'Times New Roman', serif;" class="">1. Make a clean selection of triplet events and fill a histogram of the azimuthal angle of the recoil electron for a E_gamma bin.<o:p class=""></o:p></span></div></div><div class=""><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="font-size: 12pt; font-family: 'Times New Roman', serif;" class="">2. Fit the phi distribution with N(phi) = N_0(1+P*Sigma*cos(2*phi)), determining P*Sigma.<o:p class=""></o:p></span></div></div><div class=""><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="font-size: 12pt; font-family: 'Times New Roman', serif;" class="">3. Divide by the calculated Sigma to obtain P.<o:p class=""></o:p></span></div></div><div class=""><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="font-size: 12pt; font-family: 'Times New Roman', serif;" class="">There are variations on this procedure, similar to what Justin has described for extracting Sigma, which utilize both orientations of the beam.<o:p class=""></o:p></span></div></div><div class=""><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="font-size: 12pt; font-family: 'Times New Roman', serif;" class="">My main point is that this procedure provides an average polarization for a given E_gamma bin; As long as statistics are sufficient,<o:p class=""></o:p></span></div></div><div class=""><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="font-size: 12pt; font-family: 'Times New Roman', serif;" class="">the energy binning can be chosen to match the one used in an observable extraction. Then at this level the average polarizations<o:p class=""></o:p></span></div></div><div class=""><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="font-size: 12pt; font-family: 'Times New Roman', serif;" class="">could be combined or used as input for systematic uncertainty.<o:p class=""></o:p></span></div></div><div class=""><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="font-size: 12pt; font-family: 'Times New Roman', serif;" class=""><o:p class=""> </o:p></span></div></div><div class=""><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="font-size: 12pt; font-family: 'Times New Roman', serif;" class="">-Nathan<o:p class=""></o:p></span></div></div><div class=""><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="font-size: 12pt; font-family: 'Times New Roman', serif;" class=""><o:p class=""> </o:p></span></div><div class=""><blockquote style="margin-top: 5pt; margin-bottom: 5pt;" class=""><div class=""><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="font-size: 12pt; font-family: 'Times New Roman', serif;" class="">On Feb 29, 2016, at 7:54 PM, Curtis A. Meyer <<a href="mailto:cmeyer@cmu.edu" style="color: rgb(149, 79, 114); text-decoration: underline;" class="">cmeyer@cmu.edu</a>> wrote:<o:p class=""></o:p></span></div></div><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="font-size: 12pt; font-family: 'Times New Roman', serif;" class=""><o:p class=""> </o:p></span></div><div class=""><div class=""><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="font-size: 12pt; font-family: 'Times New Roman', serif;" class="">Each will technically provide a P and an error. We should agree on how to combine them I guess.<o:p class=""></o:p></span></div><div class=""><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="font-size: 12pt; font-family: 'Times New Roman', serif;" class=""><o:p class=""> </o:p></span></div></div><div class=""><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="font-size: 12pt; font-family: 'Times New Roman', serif;" class=""><o:p class=""> </o:p></span></div><div class=""><div class=""><div class=""><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="font-size: 12pt; font-family: Helvetica, sans-serif;" class="">---------<o:p class=""></o:p></span></div></div><div class=""><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="font-size: 12pt; font-family: Helvetica, sans-serif;" class="">Curtis A. Meyer</span><span class="apple-tab-span"><o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="font-size: 12pt; font-family: Helvetica, sans-serif;" class="">MCS Associate Dean for Faculty and Graduate Affairs</span><o:p class=""></o:p></div></div><div class=""><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="font-size: 12pt; font-family: Helvetica, sans-serif;" class="">Wean: (412) 268-2745</span><span class="apple-tab-span"><o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="font-size: 12pt; font-family: Helvetica, sans-serif;" class="">Professor of Physics</span><o:p class=""></o:p></div></div><div class=""><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="font-size: 12pt; font-family: Helvetica, sans-serif;" class="">Doherty: (412) 268-3090</span><span class="apple-tab-span"><o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="font-size: 12pt; font-family: Helvetica, sans-serif;" class="">Carnegie Mellon University</span><o:p class=""></o:p></div></div><div class=""><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="font-size: 12pt; font-family: Helvetica, sans-serif;" class="">Fax: (412) 681-0648</span><span class="apple-tab-span"><o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="font-size: 12pt; font-family: Helvetica, sans-serif;" class="">Pittsburgh, PA 15213</span><o:p class=""></o:p></div></div><div class=""><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="font-size: 12pt; font-family: Helvetica, sans-serif;" class=""><a href="mailto:curtis.meyer@cmu.edu" style="color: rgb(149, 79, 114); text-decoration: underline;" class="">curtis.meyer@cmu.edu</a></span><span class="apple-tab-span"><o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="font-size: 12pt; font-family: Helvetica, sans-serif;" class=""><a href="http://www.curtismeyer.com/" style="color: rgb(149, 79, 114); text-decoration: underline;" class="">http://www.curtismeyer.com/</a></span><o:p class=""></o:p></div></div></div><div class=""><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="font-size: 12pt; font-family: Helvetica, sans-serif;" class=""><o:p class=""> </o:p></span></div></div><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="font-size: 12pt; font-family: 'Times New Roman', serif;" class=""><o:p class=""> </o:p></span></div></div><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="font-size: 12pt; font-family: 'Times New Roman', serif;" class=""><o:p class=""> </o:p></span></div><div class=""><blockquote style="margin-top: 5pt; margin-bottom: 5pt;" class=""><div class=""><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="font-size: 12pt; font-family: 'Times New Roman', serif;" class="">On Feb 29, 2016, at 7:51 PM, Paul Mattione <<a href="mailto:pmatt@jlab.org" style="color: rgb(149, 79, 114); text-decoration: underline;" class="">pmatt@jlab.org</a>> wrote:<o:p class=""></o:p></span></div></div><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="font-size: 12pt; font-family: 'Times New Roman', serif;" class=""><o:p class=""> </o:p></span></div><div class=""><div class=""><div class=""><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="font-size: 12pt; font-family: 'Times New Roman', serif;" class="">Well, both could be useful: we could compare them for computing systematic uncertainties. But yes, having a standard source that everyone agrees on is ideal. But I don’t know how to make the determination of which to use, once both systems are up and running. <o:p class=""></o:p></span></div></div><div class=""><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="font-size: 12pt; font-family: 'Times New Roman', serif;" class=""><o:p class=""> </o:p></span></div></div><div class=""><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="font-size: 12pt; font-family: 'Times New Roman', serif;" class=""> - Paul<o:p class=""></o:p></span></div></div><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="font-size: 12pt; font-family: 'Times New Roman', serif;" class=""><o:p class=""> </o:p></span></div><div class=""><div class=""><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="font-size: 12pt; font-family: 'Times New Roman', serif;" class="">On Feb 29, 2016, at 7:47 PM, Curtis A. Meyer <<a href="mailto:cmeyer@cmu.edu" style="color: rgb(149, 79, 114); text-decoration: underline;" class="">cmeyer@cmu.edu</a>> wrote:<o:p class=""></o:p></span></div></div><p class="MsoNormal" style="margin: 0in 0in 12pt; font-size: 11pt; font-family: Calibri, sans-serif;"><span style="font-size: 12pt; font-family: 'Times New Roman', serif;" class=""><o:p class=""> </o:p></span></p><blockquote style="margin-top: 5pt; margin-bottom: 5pt;" class=""><div class=""><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="font-size: 12pt; font-family: 'Times New Roman', serif;" class="">There should really only be a single number that is our best etimate from all data curtis<o:p class=""></o:p></span></div><div class=""><div class=""><div class=""><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="font-size: 12pt; font-family: Helvetica, sans-serif;" class="">---------<o:p class=""></o:p></span></div></div><div class=""><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="font-size: 12pt; font-family: Helvetica, sans-serif;" class="">Curtis A. Meyer</span><span class="apple-tab-span"><o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="font-size: 12pt; font-family: Helvetica, sans-serif;" class="">MCS Associate Dean for Faculty and Graduate Affairs</span><o:p class=""></o:p></div></div><div class=""><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="font-size: 12pt; font-family: Helvetica, sans-serif;" class="">Wean: (412) 268-2745</span><span class="apple-tab-span"><o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="font-size: 12pt; font-family: Helvetica, sans-serif;" class="">Professor of Physics</span><o:p class=""></o:p></div></div><div class=""><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="font-size: 12pt; font-family: Helvetica, sans-serif;" class="">Doherty: (412) 268-3090</span><span class="apple-tab-span"><o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="font-size: 12pt; font-family: Helvetica, sans-serif;" class="">Carnegie Mellon University</span><o:p class=""></o:p></div></div><div class=""><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="font-size: 12pt; font-family: Helvetica, sans-serif;" class="">Fax: (412) 681-0648</span><span class="apple-tab-span"><o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="font-size: 12pt; font-family: Helvetica, sans-serif;" class="">Pittsburgh, PA 15213</span><o:p class=""></o:p></div></div><div class=""><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="font-size: 12pt; font-family: Helvetica, sans-serif;" class=""><a href="mailto:curtis.meyer@cmu.edu" style="color: rgb(149, 79, 114); text-decoration: underline;" class="">curtis.meyer@cmu.edu</a></span><span class="apple-tab-span"><o:p class=""></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="font-size: 12pt; font-family: Helvetica, sans-serif;" class=""><a href="http://www.curtismeyer.com/" style="color: rgb(149, 79, 114); text-decoration: underline;" class="">http://www.curtismeyer.com/</a></span><o:p class=""></o:p></div></div></div><div class=""><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="font-size: 12pt; font-family: Helvetica, sans-serif;" class=""><o:p class=""> </o:p></span></div></div><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="font-size: 12pt; font-family: 'Times New Roman', serif;" class=""><o:p class=""> </o:p></span></div></div><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="font-size: 12pt; font-family: 'Times New Roman', serif;" class=""><o:p class=""> </o:p></span></div><div class=""><blockquote style="margin-top: 5pt; margin-bottom: 5pt;" class=""><div class=""><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="font-size: 12pt; font-family: 'Times New Roman', serif;" class="">On Feb 29, 2016, at 7:37 PM, Paul Mattione <<a href="mailto:pmatt@jlab.org" style="color: rgb(149, 79, 114); text-decoration: underline;" class="">pmatt@jlab.org</a>> wrote:<o:p class=""></o:p></span></div></div><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="font-size: 12pt; font-family: 'Times New Roman', serif;" class=""><o:p class=""> </o:p></span></div><div class=""><div class=""><div class=""><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="font-size: 12pt; font-family: 'Times New Roman', serif;" class="">Do we want two beam polarization numbers in DBeamPhoton? One calculated via the fit to the tagger spectrum, and one via the triplet polarimeter measurements? <o:p class=""></o:p></span></div></div><div class=""><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="font-size: 12pt; font-family: 'Times New Roman', serif;" class=""><o:p class=""> </o:p></span></div></div><div class=""><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="font-size: 12pt; font-family: 'Times New Roman', serif;" class=""> - Paul<o:p class=""></o:p></span></div></div><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="font-size: 12pt; font-family: 'Times New Roman', serif;" class=""><o:p class=""> </o:p></span></div><div class=""><div class=""><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="font-size: 12pt; font-family: 'Times New Roman', serif;" class="">On Feb 23, 2016, at 9:08 AM, Sean Dobbs <<a href="mailto:s-dobbs@northwestern.edu" style="color: rgb(149, 79, 114); text-decoration: underline;" class="">s-dobbs@northwestern.edu</a>> wrote:<o:p class=""></o:p></span></div></div><p class="MsoNormal" style="margin: 0in 0in 12pt; font-size: 11pt; font-family: Calibri, sans-serif;"><span style="font-size: 12pt; font-family: 'Times New Roman', serif;" class=""><o:p class=""> </o:p></span></p><blockquote style="margin-top: 5pt; margin-bottom: 5pt;" class=""><div class=""><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="font-size: 12pt; font-family: 'Times New Roman', serif;" class="">It should be easy enough to add polarization parameters to DBeamPhoton (which I think is what Curtis was advocating).<o:p class=""></o:p></span></div><div class=""><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="font-size: 12pt; font-family: 'Times New Roman', serif;" class=""><o:p class=""> </o:p></span></div></div><div class=""><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="font-size: 12pt; font-family: 'Times New Roman', serif;" class="">Supporting beam polarization parameters that vary over the run is more complicated. The CCDB doesn't currently handle conditions that vary over less than the run. A potential solution could be to write out coherent peak fit parameters in EPICS variables in the data stream, such that a LUT for the tagger counters could be regenerated over the run. Parameters for the derivation could be stored in the CCDB. Hopefully all the hard work on the accelerator side will results in a stable enough beam that we won't need this level of detail for real production runs.<o:p class=""></o:p></span></div></div><div class=""><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="font-size: 12pt; font-family: 'Times New Roman', serif;" class=""><o:p class=""> </o:p></span></div></div><div class=""><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="font-size: 12pt; font-family: 'Times New Roman', serif;" class="">Cheers,<o:p class=""></o:p></span></div></div><div class=""><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="font-size: 12pt; font-family: 'Times New Roman', serif;" class="">Sean<o:p class=""></o:p></span></div></div></div><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="font-size: 12pt; font-family: 'Times New Roman', serif;" class=""><o:p class=""> </o:p></span></div><div class=""><div class=""><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="font-size: 12pt; font-family: 'Times New Roman', serif;" class="">On Tue, Feb 23, 2016 at 2:50 AM Dominik Werthmueller <<a href="mailto:werthm@jlab.org" style="color: rgb(149, 79, 114); text-decoration: underline;" class="">werthm@jlab.org</a>> wrote:<o:p class=""></o:p></span></div></div><blockquote style="border-style: none none none solid; border-left-color: rgb(204, 204, 204); border-left-width: 1pt; padding: 0in 0in 0in 6pt; margin: 5pt 0in 5pt 4.8pt;" class=""><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="font-size: 12pt; font-family: 'Times New Roman', serif;" class="">I'm not sure we should rely on stable polarization within a run given the CEBAF beam stability and the extreme GlueX beam optics, surely Ken could comment on that in more detail. As single GlueX runs are rather long, I would definitely favor a finer granularity (ranges of events, for example). I think that a simple LUT with polarization values for all tagger counters is more flexible than storing parameters for a certain polarization parametrization that might change in the future.<br class=""><br class="">Cheers,<br class="">Dominik<br class=""><br class=""><br class="">> Am 23.02.2016 um 02:53 schrieb Justin Stevens <<a href="mailto:jrsteven@jlab.org" target="_blank" style="color: rgb(149, 79, 114); text-decoration: underline;" class="">jrsteven@jlab.org</a>>:<br class="">><br class="">> It seems the simplest place to include this in our current framework is the CCDB, assuming the polarization is not varying much within a single run or range of runs. For the energy dependence of the polarization, we could store<br class="">><br class="">> 1) a table with polarization values for individual energy bins (eg. tagger counters/columns) or<br class="">> 2) some parameters for a function which describes the polarization shape with energy<br class="">><br class="">> The polarization direction for a run should already be in RCDB, but probably should be mirrored in CCDB for simplicity.<br class="">><br class="">> -Justin<br class="">><br class="">> On Feb 22, 2016, at 8:50 PM, Paul Mattione wrote:<br class="">><br class="">>> Well, if we were to fit the polarization many different times within a run, we would need a mechanism for storing, and then looking up, the fit results relevant for each given range of events. Do we have a mechanism that can do this yet? Or am I thinking about this wrong?<br class="">>><br class="">>> - Paul<br class="">>><br class="">>> On Feb 22, 2016, at 8:30 PM, Curtis A. Meyer <<a href="mailto:cmeyer@cmu.edu" target="_blank" style="color: rgb(149, 79, 114); text-decoration: underline;" class="">cmeyer@cmu.edu</a>> wrote:<br class="">>><br class="">>>> Yes, but it does depend on the photon energy. E.g. how far away from the coherent edge are you?<br class="">>>> Events near the edge will have the highest degree of linear polarization, while those far away will<br class="">>>> have less. If the edge is stable, the function is pretty simple., but we still need to be able to assign<br class="">>>> both a polarization and a polarization direction to our photons on an event-by -event basis.<br class="">>>><br class="">>>> Curtis<br class="">>>> ---------<br class="">>>> Curtis A. Meyer MCS Associate Dean for Faculty and Graduate Affairs<br class="">>>> Wean: (412) 268-2745 Professor of Physics<br class="">>>> Doherty: (412) 268-3090 Carnegie Mellon University<br class="">>>> Fax: (412) 681-0648 Pittsburgh, PA 15213<br class="">>>><span class="Apple-converted-space"> </span><a href="mailto:curtis.meyer@cmu.edu" target="_blank" style="color: rgb(149, 79, 114); text-decoration: underline;" class="">curtis.meyer@cmu.edu</a> <a href="http://www.curtismeyer.com/" target="_blank" style="color: rgb(149, 79, 114); text-decoration: underline;" class="">http://www.curtismeyer.com/</a><br class="">>>><br class="">>>><br class="">>>><br class="">>>>> On Feb 22, 2016, at 8:25 PM, Paul Mattione <<a href="mailto:pmatt@jlab.org" target="_blank" style="color: rgb(149, 79, 114); text-decoration: underline;" class="">pmatt@jlab.org</a>> wrote:<br class="">>>>><br class="">>>>> I was under the impression that, for a given beam energy, the polarization would be relatively constant over the course of a run.<br class="">>>>><br class="">>>>> - Paul<br class="">>>>><br class="">>>>> On Feb 22, 2016, at 8:22 PM, Curtis A. Meyer <<a href="mailto:cmeyer@cmu.edu" target="_blank" style="color: rgb(149, 79, 114); text-decoration: underline;" class="">cmeyer@cmu.edu</a>> wrote:<br class="">>>>><br class="">>>>>> Hi Everyone,<br class="">>>>>><br class="">>>>>> I am not sure if we have this capability yet, but as we move forward we are going to<br class="">>>>>> want the REST files to contain the photon polarization. This is likely a function that<br class="">>>>>> we have to call when we have decided what the correct photon is, but we should have<br class="">>>>>> the hooks in place to do this on an event-by-event basis.<br class="">>>>>><br class="">>>>>> Curtis<br class="">>>>>> ---------<br class="">>>>>> Curtis A. Meyer MCS Associate Dean for Faculty and Graduate Affairs<br class="">>>>>> Wean: (412) 268-2745 Professor of Physics<br class="">>>>>> Doherty: (412) 268-3090 Carnegie Mellon University<br class="">>>>>> Fax: (412) 681-0648 Pittsburgh, PA 15213<br class="">>>>>><span class="Apple-converted-space"> </span><a href="mailto:curtis.meyer@cmu.edu" target="_blank" style="color: rgb(149, 79, 114); text-decoration: underline;" class="">curtis.meyer@cmu.edu</a> <a href="http://www.curtismeyer.com/" target="_blank" style="color: rgb(149, 79, 114); text-decoration: underline;" class="">http://www.curtismeyer.com/</a><br class="">>>>>><br class="">>>>>><br class="">>>>>><br class="">>>>>> _______________________________________________<br class="">>>>>> Halld-offline mailing list<br class="">>>>>><span class="Apple-converted-space"> </span><a href="mailto:Halld-offline@jlab.org" target="_blank" style="color: rgb(149, 79, 114); text-decoration: underline;" class="">Halld-offline@jlab.org</a><br class="">>>>>><span class="Apple-converted-space"> </span><a href="https://mailman.jlab.org/mailman/listinfo/halld-offline" target="_blank" style="color: rgb(149, 79, 114); text-decoration: underline;" class="">https://mailman.jlab.org/mailman/listinfo/halld-offline</a><br class="">>>>><br class="">>>><br class="">>><br class="">>> _______________________________________________<br class="">>> Halld-offline mailing list<br class="">>><span class="Apple-converted-space"> </span><a href="mailto:Halld-offline@jlab.org" target="_blank" style="color: rgb(149, 79, 114); text-decoration: underline;" class="">Halld-offline@jlab.org</a><br class="">>><span class="Apple-converted-space"> </span><a href="https://mailman.jlab.org/mailman/listinfo/halld-offline" target="_blank" style="color: rgb(149, 79, 114); text-decoration: underline;" class="">https://mailman.jlab.org/mailman/listinfo/halld-offline</a><br class="">><br class="">><br class="">> _______________________________________________<br class="">> Halld-offline mailing list<br class="">><span class="Apple-converted-space"> </span><a href="mailto:Halld-offline@jlab.org" target="_blank" style="color: rgb(149, 79, 114); 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font-family: 'Times New Roman', serif;" class="">_______________________________________________<br class="">Halld-offline mailing list<br class=""><a href="mailto:Halld-offline@jlab.org" style="color: rgb(149, 79, 114); text-decoration: underline;" class="">Halld-offline@jlab.org</a><br class=""><a href="https://mailman.jlab.org/mailman/listinfo/halld-offline" style="color: rgb(149, 79, 114); text-decoration: underline;" class="">https://mailman.jlab.org/mailman/listinfo/halld-offline</a><o:p class=""></o:p></span></div></blockquote></div><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="font-size: 12pt; font-family: 'Times New Roman', serif;" class=""><o:p class=""> </o:p></span></div></div><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="font-size: 12pt; font-family: 'Times New Roman', serif;" class="">_______________________________________________<br class="">Halld-offline mailing list<br class=""><a href="mailto:Halld-offline@jlab.org" style="color: rgb(149, 79, 114); text-decoration: underline;" class="">Halld-offline@jlab.org</a><br class=""><a href="https://mailman.jlab.org/mailman/listinfo/halld-offline" style="color: rgb(149, 79, 114); text-decoration: underline;" class="">https://mailman.jlab.org/mailman/listinfo/halld-offline</a><o:p class=""></o:p></span></div></div></blockquote></div><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="font-size: 12pt; font-family: 'Times New Roman', serif;" class=""><o:p class=""> </o:p></span></div></div></blockquote></div><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="font-size: 12pt; font-family: 'Times New Roman', serif;" class=""><o:p class=""> </o:p></span></div></div></div></blockquote></div><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="font-size: 12pt; font-family: 'Times New Roman', serif;" class=""><o:p class=""> </o:p></span></div></div></div><div style="margin: 0in 0in 0.0001pt; 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