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<p class="MsoNormal"><span style="font-size:14.0pt">Hi Andrea,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:14.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:14.0pt">The CTOF result looks impressive. I just wondering about high momentum tracks. Can we get 10 GeV track in CD?<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:14.0pt">The momentum dependence of the CND and CTOFxCND looks weird as well. I expect the efficiency will go up with momentum.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:14.0pt">Instead we have opposite behavior for momentum range 0.5 to 1 GeV.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:14.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:14.0pt">Regards,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:14.0pt">Valery<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:14.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:14.0pt"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:12.0pt;color:black">From: </span></b><span style="font-size:12.0pt;color:black">clas12_rgk <clas12_rgk-bounces@jlab.org> on behalf of Andrea Celentano <andrea.celentano@ge.infn.it><br>
<b>Date: </b>Thursday, December 13, 2018 at 06:29<br>
<b>To: </b>Annalisa D'Angelo <annalisa.dangelo@roma2.infn.it><br>
<b>Cc: </b>clas12 rgk <clas12_rgk@jlab.org>, Raffaella De Vita <raffaella.devita@ge.infn.it>, clas12 first exp <clas12_first_exp@jlab.org><br>
<b>Subject: </b>Re: [clas12_rgk] [Clas12_first_exp] trigger efficiency vs ECal treshold<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Dear all, <o:p></o:p></p>
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<p class="MsoNormal">the following is a first result concerning the CLAS12-CD trigger efficiency.<o:p></o:p></p>
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<li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l0 level1 lfo1">
Run was 5781, only trigger source enabled was FT in the energy range(300-8500) MeV<o:p></o:p></li><li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l0 level1 lfo1">
I selected events with tracks in CLAS12-CD by looking at REC::Particle bank and selecting those with status>4000 and charge !=0
<o:p></o:p></li></ul>
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<li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l0 level2 lfo1">
I selected events with one and one only track in CLAS12-CD<o:p></o:p></li><li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l0 level2 lfo1">
I kept only events with the track being associated to a CTOF hit (according to the event builder association).<o:p></o:p></li></ul>
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<li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l0 level1 lfo1">
For these events, I look if the trigger bit n. 25 / 26 / 27 are set or not <o:p></o:p></li></ul>
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<li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l0 level2 lfo1">
Trg bit 26 is CTOF only<o:p></o:p></li><li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l0 level2 lfo1">
Trg bit 27 is CND only (layer 1)<o:p></o:p></li><li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l0 level2 lfo1">
Trb bit 28 is CTOF*CND<o:p></o:p></li></ul>
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<p class="MsoNormal">I expect trg bit 26 efficiency to be ~ 100% since the events I am using have the track hitting the CTOF, while trg bit 27 and 28 may have lower efficiency if the track doesn’t reach the CND (layer1)<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Attached plot show efficiency as a function of momentum - trg bit 26 is red, trg bit 27 is green, trg bit 27 is blue.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">As you see, Trg bit 26 efficiency is > 99% in full momentum range.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">I also attach a plot of theta vs phi for all tracks: there are holes in phi, is this normal?<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Andrea<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><img width="436" height="601" style="width:4.5416in;height:6.2604in" id="_x0035_E95B7AE-3371-4730-9513-95DA78AB907D" src="cid:image001.png@01D492D0.7E546520" alt="cid:D8842DE8-2609-4093-9C08-3755191944D7"><o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">ZOOM:<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><img width="436" height="601" style="width:4.5416in;height:6.2604in" id="_x0035_F94225B-8D5C-45B4-A630-AD32EA7FA3C1" src="cid:image002.png@01D492D0.7E546520" alt="cid:B7EB744E-11D1-4E7F-B832-4917C75879F5"><o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><img width="436" height="601" style="width:4.5416in;height:6.2604in" id="A8B082BF-2996-4035-A21E-D961600286B0" src="cid:image003.png@01D492D0.7E546520" alt="cid:6180D50E-53DA-4FD7-8124-2065B33D331E"><o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><br>
<br>
<o:p></o:p></p>
<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
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<p class="MsoNormal">On Dec 13, 2018, at 05:04, Viktor Mokeev <<a href="mailto:mokeev@jlab.org">mokeev@jlab.org</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><span style="font-size:12.0pt">Dear FX,<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt">Anyway, I checked examples with the numerical results you mentioned in your e-mail. The check outcome is attached. My and your results coincide. So, we are on the same page. I just don't know how to read your
nomogram. I was unable to get points from them in your examples...<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt"> Best Regards,<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt"> Victor <span class="apple-converted-space"> </span><o:p></o:p></span></p>
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<p class="MsoNormal"><b>From:</b><span class="apple-converted-space"> </span>clas12_rgk <<a href="mailto:clas12_rgk-bounces@jlab.org">clas12_rgk-bounces@jlab.org</a>> on behalf of Viktor Mokeev <<a href="mailto:mokeev@jlab.org">mokeev@jlab.org</a>><br>
<b>Sent:</b><span class="apple-converted-space"> </span>Wednesday, December 12, 2018 10:20:34 PM<br>
<b>To:</b><span class="apple-converted-space"> </span>Francois-Xavier Girod-Gard<br>
<b>Cc:</b><span class="apple-converted-space"> </span>Rafayel Paremuzyan; clas12 rgk; clas12 first exp<br>
<b>Subject:</b><span class="apple-converted-space"> </span>Re: [clas12_rgk] trigger efficiency vs ECal treshold<span style="font-size:9.0pt;font-family:Helvetica">
<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.0pt;font-family:Helvetica"> <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt">Dear FX,<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt"> I am not sure I understand your plots. We need to speak. I can do this tomorrow afternoon.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt"> Best Regards,<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt"> Victor<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b>From:</b><span class="apple-converted-space"> </span>Francois-Xavier Girod <<a href="mailto:fxgirod@jlab.org">fxgirod@jlab.org</a>><br>
<b>Sent:</b><span class="apple-converted-space"> </span>Wednesday, December 12, 2018 9:54:55 PM<br>
<b>To:</b><span class="apple-converted-space"> </span>Viktor Mokeev<br>
<b>Cc:</b><span class="apple-converted-space"> </span>clas12 rgk; clas12 first exp; Rafayel Paremuzyan<br>
<b>Subject:</b><span class="apple-converted-space"> </span>Re: [clas12_rgk] trigger efficiency vs ECal treshold<span style="font-size:9.0pt;font-family:Helvetica">
<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.0pt;font-family:Helvetica"> <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.0pt;font-family:Helvetica">Dear Viktor
<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.0pt;font-family:Helvetica"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.0pt;font-family:Helvetica">I have those series of over-informative plots as attached in case they can help the discussion<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.0pt;font-family:Helvetica">They show the kinematic coverage for a given beam energy<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.0pt;font-family:Helvetica"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.0pt;font-family:Helvetica">Units are GeV and degrees. For instance, the points<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.0pt;font-family:Helvetica">( Q^2 = 2 , W = 3 ) corresponds to approximately ( mom = 1.1 , theta = 30 )<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.0pt;font-family:Helvetica">( Q^2 = 5 , W = 2.5 ) corresponds to approximately ( mom = 1 , theta = 53 ) (this point is off scale on the plots)<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.0pt;font-family:Helvetica">The 35 degree angle at W = 2.5 occurs around Q^2 = 3.8 and mom = 1.6<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.0pt;font-family:Helvetica"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.0pt;font-family:Helvetica">Best regards<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.0pt;font-family:Helvetica">FX<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.0pt;font-family:Helvetica"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.0pt;font-family:Helvetica">On Wed, Dec 12, 2018 at 6:26 PM Viktor Mokeev <<a href="mailto:mokeev@jlab.org">mokeev@jlab.org</a>> wrote:<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt">Dear All,<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt"> From FX trigger efficiency plot, I see efficiency problems at the lab. energies of the scattered electron <2.0 GeV or for \nu value above 5.5 GeV for the electron beam energy 7.5 GeV. It corresponds to the
following W ranges where we have the problem with trigger efficiency:<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt">Q^2=2.0 GeV^2 W>3.0 GeV<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt">Q^2=5.0 GeV^2 W>2.5 GeV<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt">For hybrid baryon search, we have no any problem with the trigger efficiency at Q^2<2.0 GeV^2 since the lightest hybrids are expected in the mass range <2.5 GeV. Furthermore, the initial search for hybrid
baryons will be carried out at Q^2<2.0 GeV^2.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt"> Best Regards,<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt"> Victor<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b>From:</b><span class="apple-converted-space"> </span>Francois-Xavier Girod <<a href="mailto:fxgirod@jlab.org" target="_blank">fxgirod@jlab.org</a>><br>
<b>Sent:</b><span class="apple-converted-space"> </span>Wednesday, December 12, 2018 6:09:53 PM<br>
<b>To:</b><span class="apple-converted-space"> </span>Viktor Mokeev<br>
<b>Cc:</b><span class="apple-converted-space"> </span>clas12 rgk; clas12 first exp; Rafayel Paremuzyan<br>
<b>Subject:</b><span class="apple-converted-space"> </span>Re: [clas12_rgk] trigger efficiency vs ECal treshold<span style="font-size:9.0pt;font-family:Helvetica">
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<p class="MsoNormal"><span style="font-size:9.0pt;font-family:Helvetica"> <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.0pt;font-family:Helvetica">Dear Viktor
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<p class="MsoNormal"><span style="font-size:9.0pt;font-family:Helvetica"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.0pt;font-family:Helvetica">Rafo can confirmed as he produced the plot, my understanding is that the electron momentum is measured by the drift chambers<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.0pt;font-family:Helvetica"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.0pt;font-family:Helvetica">Best regards<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.0pt;font-family:Helvetica">FX<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.0pt;font-family:Helvetica">On Wed, Dec 12, 2018 at 6:08 PM Viktor Mokeev <<a href="mailto:mokeev@jlab.org" target="_blank">mokeev@jlab.org</a>> wrote:<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt">Dear FX,<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt"> Just to make sure, whether P on your plots is the energy=momentum of the scattered electron?<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt">Best Regards,<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt"> Victor<o:p></o:p></span></p>
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<p class="MsoNormal"><b>From:</b><span class="apple-converted-space"> </span>clas12_rgk <<a href="mailto:clas12_rgk-bounces@jlab.org" target="_blank">clas12_rgk-bounces@jlab.org</a>> on behalf of Francois-Xavier Girod <<a href="mailto:fxgirod@jlab.org" target="_blank">fxgirod@jlab.org</a>><br>
<b>Sent:</b><span class="apple-converted-space"> </span>Wednesday, December 12, 2018 5:58:01 PM<br>
<b>To:</b><span class="apple-converted-space"> </span>clas12 rgk;<span class="apple-converted-space"> </span><a href="mailto:clas12_first_exp@jlab.org" target="_blank">clas12_first_exp@jlab.org</a><br>
<b>Cc:</b><span class="apple-converted-space"> </span>Rafayel Paremuzyan<br>
<b>Subject:</b><span class="apple-converted-space"> </span>[clas12_rgk] trigger efficiency vs ECal treshold<span style="font-size:9.0pt;font-family:Helvetica">
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<p class="MsoNormal"><span style="font-size:9.0pt;font-family:Helvetica">Dear all
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<p class="MsoNormal"><span style="font-size:9.0pt;font-family:Helvetica">During today's meeting I attempted to have a discussion on the trigger efficiency as function of ECal threshold. Contradicting statements were made during the meeting, so I want this discussion
to be on record here.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.0pt;font-family:Helvetica"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.0pt;font-family:Helvetica">Please see the plot<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.0pt;font-family:Helvetica"><a href="https://www.jlab.org/Hall-B/secure/clas12/rec_mon/P_Good_emWithEC_5786.png" target="_blank">https://www.jlab.org/Hall-B/secure/clas12/rec_mon/P_Good_emWithEC_5786.png</a><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.0pt;font-family:Helvetica">from Rafo's study of the trigger efficiency. He analyzed run 5786 which was taken with the random trigger. <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.0pt;font-family:Helvetica">- in blue all "good electrons" with Nphe>2, E_PCal > 60 MeV, sampling fraction > 0.2 and fiducial cuts<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.0pt;font-family:Helvetica">- in orange, the electrons satisfy in addition E_ECal > 300 MeV<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.0pt;font-family:Helvetica">- in red, the events for which the orange set was missing the electron trigger bit<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.0pt;font-family:Helvetica">The trigger efficiency is defined as (orange - red) / orange<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.0pt;font-family:Helvetica"><a href="https://www.jlab.org/Hall-B/secure/clas12/rec_mon/Eff_All_Good_em_trg_threshold_5786.png" target="_blank">https://www.jlab.org/Hall-B/secure/clas12/rec_mon/Eff_All_Good_em_trg_threshold_5786.png</a><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.0pt;font-family:Helvetica">The trigger efficiency below 2 GeV drops rapidly, and measuring a cross section in this region is challenging<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.0pt;font-family:Helvetica">My question during the meeting was: do we already have data to show the trigger efficiency when the threshold is 150 MeV. My understanding is that we do not have this data and that to
answer this question we need to take another random trigger run with the lower threshold.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.0pt;font-family:Helvetica">What I have in mind is the following: I agree that the bulk of the RG-K data taking can take place at 300 MeV ECal trigger threshold and highest possible luminosity, but I would like to
consider the possibility to take a few days at a lower trigger threshold to extend the cross section measurement to higher W. Again my purpose is to minimize the final systematic uncertainties.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.0pt;font-family:Helvetica"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.0pt;font-family:Helvetica">Best regards<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.0pt;font-family:Helvetica">FX<o:p></o:p></span></p>
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<p class="MsoNormal"><FX_VM_check.pdf><span style="font-size:9.0pt;font-family:Helvetica">_______________________________________________<br>
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