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<div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 14pt; color: rgb(0, 0, 0); background-color: rgb(255, 255, 255);">
Dear Silvia,</div>
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You have to take into consideration that rgc group is using very weak electron trigger.</div>
<div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 14pt; color: rgb(0, 0, 0); background-color: rgb(255, 255, 255);">
We don't use DC roads or Q2 trigger up to now by unknown for me reason. </div>
<div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 14pt; color: rgb(0, 0, 0); background-color: rgb(255, 255, 255);">
Most of the events have nothing to do with the electron in the final state, it is just garbage.</div>
<div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 14pt; color: rgb(0, 0, 0); background-color: rgb(255, 255, 255);">
You will find electron (PID=11) only in 15% of the events.</div>
<div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 14pt; color: rgb(0, 0, 0); background-color: rgb(255, 255, 255);">
I want to say that the purity of the rgc trigger is 15% only like in old CLAS experiments.</div>
<div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 14pt; color: rgb(0, 0, 0); background-color: rgb(255, 255, 255);">
Do you have somebody who is analyzing rgc data today?</div>
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Best regards,</div>
<div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 14pt; color: rgb(0, 0, 0); background-color: rgb(255, 255, 255);">
Valery</div>
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<br>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> Rgc <rgc-bounces@jlab.org> on behalf of silvia@jlab.org <silvia@jlab.org><br>
<b>Sent:</b> Tuesday, August 16, 2022 10:14<br>
<b>To:</b> rgc@jlab.org <rgc@jlab.org><br>
<b>Subject:</b> [Rgc] status of the RGC data taking and nDVCS perspective</font>
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<div class="PlainText">Dear all,<br>
I just ran my script to check the status of the data taking.<br>
Here is where we stand for 10.5-GeV, FT ON:<br>
<br>
total events 12126288227<br>
total nh3 4172837461<br>
total nd3 6075008990<br>
total carbon 1321716288<br>
<br>
total nh3+ 2297297723<br>
total nh3- 1875539738<br>
total nd3+ 3085305030<br>
total nd3- 2989703960<br>
<br>
total nh3+ hwp in 1032553282<br>
total nh3+ hwp out 1264744441<br>
total nh3- hwp in 856758263<br>
total nh3- hwp out 1018781475<br>
total nd3+ hwp in 1454208809<br>
total nd3+ hwp out 1631096221<br>
total nd3- hwp in 1651649502<br>
total nd3- hwp out 1338054458<br>
<br>
Following yesterday's discussion, I started a rough comparison, by looking<br>
back at the total number of collected triggers for RGB. Considering the<br>
datasets we used for nDVCS (Spring19 and Spring20), we had a total of<br>
~34.3B triggers, all with FT ON. From these data we obtained roughly 140k<br>
nDVCS events. ~70% of these events have a photon in the FT. Given the<br>
small size of the nDVCS BSA (~5%), we managed to get only 2D beam-spin<br>
asymmetries (vs phi and one variable at a time between Q2, xB, t).<br>
<br>
Right now in RGC we have ~6B ND3 triggers. The dilution factor for nDVCS<br>
is expected to be around 40%, from Noémie's simulations. Assuming same<br>
acceptance/efficiency as RGB, this yields about 10k nDVCS events collected<br>
until now in RGC, a factor of ~14 less than RGB. The nDVCS TSA is expected<br>
(VGG predictions) to be about a factor of 3 bigger than the nDVCS BSA,<br>
which roughly compensates the ND3 target polarization (which seems, from<br>
preliminary PbPt analysis, around 30%).<br>
<br>
I will look into pDVCS in the next days, unless anyone else wants to do it.<br>
<br>
Best regards,<br>
Silvia<br>
<br>
<br>
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