<html><head><style type='text/css'>p { margin: 0; }</style></head><body><div style='font-family: arial,helvetica,sans-serif; font-size: 12pt; color: #000000'>Mike,<div><br></div><div>What is the theta_lab distribution for leptons and pions? Also what is the opening angle distribution in the lab for lepton pairs and for pion pairs?</div><div><br><div><span name="x"></span>-Eugene<span name="x"></span><br></div><br><hr id="zwchr"><blockquote style="border-left:2px solid rgb(16, 16, 255);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;"><b>From: </b>"Michael C. Kunkel" <mkunkel@jlab.org><br><b>To: </b>"Dennis Weygand" <weygand@jlab.org><br><b>Cc: </b>g12@jlab.org<br><b>Sent: </b>Monday, March 18, 2013 3:52:13 PM<br><b>Subject: </b>Re: [G12] vertex distribution<br><br>
<div class="moz-text-flowed" style="font-family: -moz-fixed;
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" target="_blank">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">Does anyone have plots of vertex distributions (z, x
vs y, r from MVRT) for any topology?
<div>Dennis</div>
<div><br>
<div>
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<div>--</div>
<div>Dennis Weygand</div>
<div><a href="mailto:weygand@jlab.org" target="_blank">weygand@jlab.org</a></div>
<div>(757) 269-5926 (office)</div>
<div>(757) 870-4844 (cell)</div>
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