[Clas12_dileptons] Efficiency

[Pierre Chatagnon]

Hi all,

For the efficiency factorisation, there might be a way to do it with MC indeed. I'll look for that next year.
For the efficiency drop, what I showed was actually particle efficiency, which should be smaller than tracker efficiency, making it even more puzzling. I will repeat this study with another final state for cross check.

Have a nice holidays
Cheers
Pierre

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________________________________
From: Clas12_dileptons <clas12_dileptons-bounces at jlab.org> on behalf of Nathan Baltzell via Clas12_dileptons <clas12_dileptons at jlab.org>
Sent: Thursday, December 22, 2022 4:05:18 PM
To: Stepan Stepanyan <stepanya at jlab.org>
Cc: Raffaella De Vita <devita at jlab.org>; Clas12_dileptons at jlab.org <clas12_dileptons at jlab.org>
Subject: Re: [Clas12_dileptons] Efficiency

Hi Stepan,

Is there any documentation on those previous studies?  How exactly was it done?

-Nathan

On Dec 22, 2022, at 4:00 PM, Stepan Stepanyan <stepanya at jlab.org<mailto:stepanya at jlab.org>> wrote:

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<mailto: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
The meeting room at JLab is F-228.
Meeting link is :
https://jlab-org.zoomgov.com/j/1617534470?pwd=UkR3RlZOSVk3V1RQY2JnMUdIM3RMUT09

Meetng ID 161 753 4470
passcode is 2022

Rafo
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