[Clas12_dileptons] Efficiency

Stepan Stepanyan stepanya at jlab.org
Thu Dec 22 16:00:29 EST 2022

Hi Nathan

We had a much better description of MC efficiency dependence on the beam current in the past. Nick was testing the algorithm for inclusive electron MC and was very close to the expectations from data, within a couple of %. The version on OSG is different from what we used during TF work and significantly underestimates efficiency drop.

Regards, Stepan 

> On Dec 22, 2022, at 3:31 PM, Nathan Baltzell via Clas12_dileptons <clas12_dileptons at jlab.org> wrote:
> Hi Pierre,
> Yes, nice presentation!
> Regarding questions on CLAS12 background merging ...
> My understand is that it currently does two things:  adds background hits and accounts for a holdoff time (rejecting hits that are too close in time to a previous hit on the same channel).  I know we thought the holdoffs were modeled well for DC, because that's where the holdoffs were presumed to be most important, but I'm not sure about all the other detectors.
> But one thing I know it doesn't do is account for time evolution in digitization (and the same goes for GEMC and its internal background).  If multiple hits would have merged in hardware, that is not addressed properly but left interpreted as two separate hits.  Maybe/probably that's not too important for detectors that don't use energy deposition offline and/or have a large holdoff time, like DC, but it would get more important at higher rates/luminosity.
> -Nathan
>> On Dec 22, 2022, at 2:13 PM, Valery Kubarovsky via Clas12_dileptons <clas12_dileptons at jlab.org <mailto:clas12_dileptons at jlab.org>> wrote:
>> Hi Pierre,
>> You made a very good presentation today.
>> I think that we can verify the main assumption of Stepan's paper "Studies of background with the scattered electron" that the efficiency is the product of individual efficiencies of the electrons, positrons and protons;
>> <image.png>
>> using your MC model. What do you think?
>> You have to use MC with BG merging.
>> Thanks,
>> Valery
>> From: Clas12_dileptons <clas12_dileptons-bounces at jlab.org <mailto:clas12_dileptons-bounces at jlab.org>> on behalf of Rafayel Paremuzyan via Clas12_dileptons <clas12_dileptons at jlab.org <mailto:clas12_dileptons at jlab.org>>
>> Sent: Monday, December 19, 2022 16:51
>> To: Clas12_dileptons at jlab.org <mailto:Clas12_dileptons at jlab.org> <clas12_dileptons at jlab.org <mailto:clas12_dileptons at jlab.org>>
>> Subject: [Clas12_dileptons] Meeting tomorrow
>> Dear all,
>> let's meet tomorrow.
>> Please put your material at the link below.
>> https://clasweb.jlab.org/rungroups/tlc/wiki/index.php/Meet_December_20_22 <https://clasweb.jlab.org/rungroups/tlc/wiki/index.php/Meet_December_20_22>
>> The meeting room at JLab is F-228.
>> Meeting link is :
>> https://jlab-org.zoomgov.com/j/1617534470?pwd=UkR3RlZOSVk3V1RQY2JnMUdIM3RMUT09 <https://jlab-org.zoomgov.com/j/1617534470?pwd=UkR3RlZOSVk3V1RQY2JnMUdIM3RMUT09>
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>> passcode is 2022
>> Rafo
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