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Liping & Ashot,</div>
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Thank you for your explanations. Could you define the precision of the calibration needed? pi0 peak at
<span>134.97</span> MeV/c^2 +/- 1%, 2%, 3% ...</div>
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tks ig.<br>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> gasparan@jlab.org <gasparan@jlab.org><br>
<b>Sent:</b> Tuesday, March 17, 2020 4:24 PM<br>
<b>To:</b> Igal Jaegle <ijaegle@jlab.org><br>
<b>Cc:</b> primexd@jlab.org <primexd@jlab.org><br>
<b>Subject:</b> Re: [Primexd] [EXTERNAL] Re: BCAL calibration status</font>
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Hi Igal,<br>
<br>
We are using the BCAL calorimeter to veto any recoiled particle<br>
that are in time with the two photon timing. That is to minimize<br>
the any possible inelastic production of eta-meson from the target<br>
4He nuclei. The elastically recoiled 4He nucleus can not pass the<br>
target and reach the BCAL (very low energies).<br>
So, in order to make a reasonable cut level the BCAL has to have some<br>
level of calibration. It can even be a very rough calibration but, it<br>
needs to be calibrated.<br>
<br>
Ashot<br>
<br>
<br>
> Spokespersons,<br>
><br>
> We need your inputs to answer the question of Zizis (see below). Basically<br>
> why do we need BCAL calibrated ie all pi0 and eta at the correct mass +/-<br>
> 1 %(?) and for all momenta(?) and for all<br>
> PrimEX-D phase I physics runs?<br>
><br>
> tks ig.<br>
> ________________________________<br>
> From: Zisis Papandreou <Zisis.Papandreou@uregina.ca><br>
> Sent: Tuesday, March 17, 2020 9:25 AM<br>
> To: sdobbs@fsu.edu <sdobbs@fsu.edu>; Mark-Macrae Dalton <dalton@jlab.org>;<br>
> Elton Smith <elton@jlab.org>; Igal Jaegle <ijaegle@jlab.org>; Jonathan<br>
> Zarling <jzarling@jlab.org>; Alexander Somov <somov@jlab.org>;<br>
> ksv656@uregina.ca <ksv656@uregina.ca><br>
> Subject: [EXTERNAL] Re: BCAL calibration status<br>
><br>
> Hello Igal et al:<br>
><br>
> yes, work is being done: jobs are running on the calibration and MC<br>
> studies are also being carried out. While we wait for those, this is a<br>
> good time to get "organized".<br>
><br>
> In our group, we are not sure of what the objectives and priorities are<br>
> for the Primex runs, particularly as they pertain to the BCAL<br>
><br>
> Igal, can you or Sasha, perhaps make a few slides or write a one-pager,<br>
> explaining those objectives? It would be good if there were timelines (of<br>
> what you are trying to extract from the data) or the tasks listed in order<br>
> of priority. We could then go over those at this Thursday's Calorimetry<br>
> meeting.<br>
><br>
> The reason we ask for this is that the Regina crew has other tasks on<br>
> their plates and we should optimize our collective operations. In<br>
> parallel, Karthik and Varun are studying to take their Ph.D. Comprehensive<br>
> exams in May.<br>
><br>
> Thanks and best regards, Zisis...<br>
><br>
><br>
><br>
> Dr. Zisis Papandreou<br>
> Head, Department of Physics<br>
> Professor of Physics, Ph.D, P.Phys.<br>
> ---------------------------------------------------------<br>
> Department of Physics<br>
> University of Regina<br>
> 3737 Wascana Parkway<br>
> Regina, SK S4S 0A2 CANADA<br>
><br>
> Phone: (306) 585-5379<br>
> Fax: (306) 585-5659<br>
> Email: zisis@uregina.ca<<a href="mailto:zisis@uregina.ca">mailto:zisis@uregina.ca</a>><br>
> Website:<br>
> <a href="https://www.uregina.ca/science/physics/people/faculty-research/zisis-papandreou/<https://urldefense.proofpoint.com/v2/url?u=https-3A__www.uregina.ca_science_physics_people_faculty-2Dresearch_zisis-2Dpapandreou_&d=DwMFaQ&c=CJqEzB1piLOyyvZjb8YUQw&r=09G0_vNCJcXuzy4NWhn5xA&m=U7L4cM9ddlQCq5yqk3vWCpavDnycdGhqcrxMlnEog30&s=J7USysbdKiCvthhYBk41ZwOhIoOL__BaE74kfELv1zQ&e=">
https://www.uregina.ca/science/physics/people/faculty-research/zisis-papandreou/<https://urldefense.proofpoint.com/v2/url?u=https-3A__www.uregina.ca_science_physics_people_faculty-2Dresearch_zisis-2Dpapandreou_&d=DwMFaQ&c=CJqEzB1piLOyyvZjb8YUQw&r=09G0_vNCJcXuzy4NWhn5xA&m=U7L4cM9ddlQCq5yqk3vWCpavDnycdGhqcrxMlnEog30&s=J7USysbdKiCvthhYBk41ZwOhIoOL__BaE74kfELv1zQ&e=</a>><br>
><br>
>>>> Igal Jaegle <ijaegle@jlab.org> 03/17/20 3:59 AM >>><br>
> BCAL colleagues,<br>
><br>
> Do you have any news for the BCAL calibration of the PrimEX-D<br>
> measurements?<br>
><br>
> tks ig.<br>
> _______________________________________________<br>
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> Primexd@jlab.org<br>
> <a href="https://mailman.jlab.org/mailman/listinfo/primexd">https://mailman.jlab.org/mailman/listinfo/primexd</a><br>
><br>
<br>
<br>
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