<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="">Valery,<div class=""><br class=""></div><div class="">There is no argument and everyone will agree with you that 11 GeV is better. However, this document that was circulated is for discussion in RG-A for experiment E12-12-001. Most of proposed measurements in that experiment can be done with even 10 GeV beam (note pentaquark are not part of that experiment). It is more likely that we will not have full 5 pass energy for while, and requesting for an energy that will not be available will put us in disadvantage. For example, one can argue that since machine cannot deliver 11 GeV and experiment can only run with 11 GeV, then no reason to accommodate other run conditions from that experiment (torus setting, trigger, luminosity …) until the beam energy will be acceptable. </div><div class=""><br class=""></div><div class="">Stepan</div><div class=""> <br class=""><div><blockquote type="cite" class=""><div class="">On Apr 7, 2017, at 4:35 PM, Valery Kubarovsky <<a href="mailto:vpk@jlab.org" class="">vpk@jlab.org</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div class=""><div style="font-family: arial, helvetica, sans-serif; font-size: 12pt;" class=""><div class="">I suggest just to change10 GeV electron beam energy to 11. That's it.</div><div class=""><br data-mce-bogus="1" class=""></div><div class=""><br class=""></div><hr id="zwchr" data-marker="__DIVIDER__" class=""><div data-marker="__HEADERS__" class=""><blockquote style="border-left-width: 2px; border-left-style: solid; border-left-color: rgb(16, 16, 255); margin-left: 5px; padding-left: 5px; font-weight: normal; font-style: normal; text-decoration: none; font-family: Helvetica, Arial, sans-serif; font-size: 12pt;" data-mce-style="border-left: 2px solid #1010FF; margin-left: 5px; padding-left: 5px; color: #000; font-weight: normal; font-style: normal; text-decoration: none; font-family: Helvetica,Arial,sans-serif; font-size: 12pt;" class=""><b class="">From: </b>"Stepan Stepanyan" <<a href="mailto:stepanya@jlab.org" class="">stepanya@jlab.org</a>><br class=""><b class="">To: </b>"Pawel Nadel-Turonski" <<a href="mailto:turonski@jlab.org" class="">turonski@jlab.org</a>><br class=""><b class="">Cc: </b>"Valery Kubarovsky" <<a href="mailto:vpk@jlab.org" class="">vpk@jlab.org</a>>, <a href="mailto:ee@jlab.org" class="">ee@jlab.org</a><br class=""><b class="">Sent: </b>Friday, April 7, 2017 4:26:23 PM<br class=""><b class="">Subject: </b>Re: [ee] TCS-JPsi meeting on Thursday at 9 am EST<br class=""></blockquote></div><div data-marker="__QUOTED_TEXT__" class=""><blockquote style="border-left-width: 2px; border-left-style: solid; border-left-color: rgb(16, 16, 255); margin-left: 5px; padding-left: 5px; font-weight: normal; font-style: normal; text-decoration: none; font-family: Helvetica, Arial, sans-serif; font-size: 12pt;" data-mce-style="border-left: 2px solid #1010FF; margin-left: 5px; padding-left: 5px; color: #000; font-weight: normal; font-style: normal; text-decoration: none; font-family: Helvetica,Arial,sans-serif; font-size: 12pt;" class="">The threshold is ~10 GeV. At 10.5 GeV photon energy the W=4.54 GeV, the heaviest pentaquark mass is 4.45 GeV. Not much cushion but still doable. <div class=""><br class=""></div><div class="">Stepan</div><div class=""><br class=""><div class=""><blockquote class=""><div class="">On Apr 7, 2017, at 4:22 PM, Pawel Nadel-Turonski <<a href="mailto:turonski@jlab.org" class="" target="_blank" data-mce-href="mailto:turonski@jlab.org">turonski@jlab.org</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class="" data-mce-style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;">Hi Valery,<div class=""><br class=""></div><div class="">This is a very good point. But we may not have an energy higher than 10.6 GeV available to us this fall. Perhaps we should try to make an argument to the new management for trying to get the energy up to nominal as soon as possible?</div><div class=""><br class=""></div><div class="">Cheers,</div><div class="">Pawel</div><div class=""><br class=""></div><div class=""><br class=""><div class=""><blockquote class=""><div class="">On Apr 7, 2017, at 3:28 PM, Valery Kubarovsky <<a href="mailto:vpk@jlab.org" class="" target="_blank" data-mce-href="mailto:vpk@jlab.org">vpk@jlab.org</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div style="font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; font-family: arial, helvetica, sans-serif; font-size: 12pt;" class="" data-mce-style="font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; font-family: arial, helvetica, sans-serif; font-size: 12pt;"><div class="">Hi Charles,</div><div class=""><br class=""></div><div class="">The threshold photon energy for the LHCb pentaquark (J/psi-p) production</div><div class="">gamma+p--> P5 --> J/psi+p</div><div class="">is 10.5 GeV. It means that the election energy has to be 11 GeV.</div><div class="">I don't think that we want to miss the possibility to found the signal in the photo production reaction.</div><div class=""><br class=""></div><div class="">Regards,</div><div class="">Valery</div><div class=""><br class=""></div><hr id="zwchr" class=""><div class=""><blockquote style="border-left-width: 2px; border-left-style: solid; border-left-color: rgb(16, 16, 255); margin-left: 5px; padding-left: 5px; font-weight: normal; font-style: normal; text-decoration: none; font-family: Helvetica, Arial, sans-serif; font-size: 12pt;" class="" data-mce-style="border-left-width: 2px; border-left-style: solid; border-left-color: #1010ff; margin-left: 5px; padding-left: 5px; font-weight: normal; font-style: normal; text-decoration: none; font-family: Helvetica, Arial, sans-serif; font-size: 12pt;"><b class="">From:<span class="Apple-converted-space"> </span></b>"Charles Earl Hyde" <<a href="mailto:hyde@jlab.org" class="" target="_blank" data-mce-href="mailto:hyde@jlab.org">hyde@jlab.org</a>><br class=""><b class="">To:<span class="Apple-converted-space"> </span></b>"Pawel Nadel-Turonski" <<a href="mailto:turonski@jlab.org" class="" target="_blank" data-mce-href="mailto:turonski@jlab.org">turonski@jlab.org</a>><br class=""><b class="">Cc:<span class="Apple-converted-space"> </span></b><a href="mailto:ee@jlab.org" class="" target="_blank" data-mce-href="mailto:ee@jlab.org">ee@jlab.org</a><br class=""><b class="">Sent:<span class="Apple-converted-space"> </span></b>Thursday, April 6, 2017 10:28:08 AM<br class=""><b class="">Subject:<span class="Apple-converted-space"> </span></b>Re: [ee] TCS-JPsi meeting on Thursday at 9 am EST<br class=""></blockquote></div><div class=""><blockquote style="border-left-width: 2px; border-left-style: solid; border-left-color: rgb(16, 16, 255); margin-left: 5px; padding-left: 5px; font-weight: normal; font-style: normal; text-decoration: none; font-family: Helvetica, Arial, sans-serif; font-size: 12pt;" class="" data-mce-style="border-left-width: 2px; border-left-style: solid; border-left-color: #1010ff; margin-left: 5px; padding-left: 5px; font-weight: normal; font-style: normal; text-decoration: none; font-family: Helvetica, Arial, sans-serif; font-size: 12pt;">Pawel, Stepan, et al<br class="">Here is my summary of the Run Group A requirements for TCS/J-Psi<br class="">from this morning's meeting.<br class="">I think it will be important to send a version of this (probably marked<br class="">preliminary)<br class="">to all RGA spokespersons before the first RGA meeting, possibly scheduled for<br class="">next week.<br class=""><br class="">Revisions and additions are welcome (maybe some of my editorial comments<br class="">should be removed from the request we send to RGA).<br class="">I think it will be helpful to be as specific/quantitative as possible,<br class="">even if many things<br class="">are uncertain and most will be subject to collaborative negotiation.<br class=""><br class="">Charles E. Hyde<br class="">University Professor of Physics<br class="">Old Dominion University<br class=""><a href="http://www.odu.edu/~chyde" class="" target="_blank" data-mce-href="http://www.odu.edu/~chyde">www.odu.edu/~chyde</a><br class="">_______________________________________________<br class="">ee mailing list<br class=""><a href="mailto:ee@jlab.org" class="" target="_blank" data-mce-href="mailto:ee@jlab.org">ee@jlab.org</a><br class=""><a href="https://mailman.jlab.org/mailman/listinfo/ee" class="" target="_blank" data-mce-href="https://mailman.jlab.org/mailman/listinfo/ee">https://mailman.jlab.org/mailman/listinfo/ee</a></blockquote></div></div></div></blockquote></div><br class=""></div></div>_______________________________________________<br class="">ee mailing list<br class=""><a href="mailto:ee@jlab.org" class="" target="_blank" data-mce-href="mailto:ee@jlab.org">ee@jlab.org</a><br class=""><a href="https://mailman.jlab.org/mailman/listinfo/ee" class="">https://mailman.jlab.org/mailman/listinfo/ee</a><br class=""></div></blockquote></div><br class=""></div><br class=""></blockquote></div></div></div></div></blockquote></div><br class=""></div></body></html>