<html><head></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">OK, I think I got it:<div><br></div><div>Your e+ e- gamma sample has a large number of events such that:</div><div><br></div><div>1) pi0 --> gamma gamma</div><div>2) One of the gamma's converts in material outside of the target</div><div><br></div><div>MVRT still has the correct vertex since the e+ e- opening angle is 0.</div><div><br></div><div>Dennis</div><div><br></div><div><br></div><div><br></div><div><br><div><div>On Mar 18, 2013, at 3:52 PM, Michael C. Kunkel wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite">
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font-size: 12px;" lang="x-western">Greetings,
<br>
<br>
I got my hands on PPipPim data to plot the MVRT information.
<br>
I have posted the plots of the r of MVRT and x vs. y of MVRT for
the following topologies:
<br>
<br>
Pion; Missing Mass Proton Pi+ Pi- -> 0 (exclusive)
<br>
Effective Mass Pi+ Pi- ->Omega
<br>
<br>
Lepton: Missing Mass Proton e+ e- < Pi0
<br>
Missing Mass Proton e+ e- gamma -> 0 (exclusive)
<br>
Effective Mass e+ e- gamma ->Pi0
<br>
<br>
Plot can be found at<br>
<a class="moz-txt-link-freetext" href="https://clasweb.jlab.org/rungroups/g7/wiki/index.php/Reconstruction_study">https://clasweb.jlab.org/rungroups/g7/wiki/index.php/Reconstruction_study</a><br>
for March 18, 2013<br>
<br>
Before anyone cries "bug", let me assure everyone that the manner
in which the MVRT data is collected for the pions is the same as
for leptons, i.e. a clasEvent function.
<br>
<br>
From what I deduce, it appears that either exclusive Pi0
production can happen outside of the target (cough cough), or for
some reason when the particle is a lepton, we have resolution
problems. Neither I can understand from looking at what creates
the MVRT.
<br>
<br>
Thoughts and help would be appreciated greatly.
<br>
<br>
BR
<br>
MK
<br>
<br>
<br>
</div>
<div class="moz-cite-prefix">On 3/13/13 3:46 PM, Dennis Weygand
wrote:<br>
</div>
<blockquote cite="mid:03F1854B-6EFA-4364-A2FF-BF43865D9D87@jlab.org" type="cite">Does anyone have plots of vertex distributions (z, x
vs y, r from MVRT) for any topology?
<div>Dennis</div>
<div><br>
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space; -webkit-line-break: after-white-space; "><span class="Apple-style-span" style="border-collapse: separate; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; -webkit-text-decorations-in-effect: none; text-indent: 0px; -webkit-text-size-adjust: auto; text-transform: none; orphans: 2; white-space: normal; widows: 2; word-spacing: 0px; ">
<div>--</div>
<div>Dennis Weygand</div>
<div><a moz-do-not-send="true" href="mailto:weygand@jlab.org">weygand@jlab.org</a></div>
<div>(757) 269-5926 (office)</div>
<div>(757) 870-4844 (cell)</div>
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<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; font-size: medium; "><span class="Apple-style-span" style="border-collapse: separate; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; -webkit-text-decorations-in-effect: none; text-indent: 0px; -webkit-text-size-adjust: auto; text-transform: none; orphans: 2; white-space: normal; widows: 2; word-spacing: 0px; "><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><span class="Apple-style-span" style="border-collapse: separate; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; -webkit-text-decorations-in-effect: none; text-indent: 0px; -webkit-text-size-adjust: auto; text-transform: none; orphans: 2; white-space: normal; widows: 2; word-spacing: 0px; "><div>--</div><div>Dennis Weygand</div><div><a href="mailto:weygand@jlab.org">weygand@jlab.org</a></div><div>(757) 269-5926 (office)</div><div>(757) 870-4844 (cell)</div><div><br class="khtml-block-placeholder"></div><br class="Apple-interchange-newline"></span></div></span></span><br class="Apple-interchange-newline">
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