[Clas12_calcom] 10:00 analysis meeting today

[Valery Kubarovsky]

Please don’t ask for pid=11 in the skim. Just track with any momentum. We will make the selections later on. This cut (pid=11) will definitely bias the trigger study. 

> On Jan 5, 2018, at 17:05, Francois-Xavier Girod <fxgirod at jlab.org> wrote:
> 
> I put the requirement on the trigger as per Valery's request to define how the trigger efficiency should be measured.
> 
> If you guys can come up with a clear definition of what you call trigger efficiency, I will be happy to re-produce it as per the cooking monitoring. I can set id=11 and a reasonable chi2 cut, I think we also need to agree on a momentum cut, that gives me a number of electrons in the numerator. How do you define the number in the denominator?
> 
>> On Fri, Jan 5, 2018 at 5:00 PM, Rafayel Paremuzyan <rafopar at jlab.org> wrote:
>> Dear Fx,
>> 
>> Are you using the RUN_config::trigger? for decoding the trigger? in reality as Ben mentioned this before,
>> it captures very small portion of time window (few tens of ns) wrt readout window size (400 ns), while
>> the vtp2 reports triggers with 4ns time resolution in a 400 ns time interval,
>> 
>> However, if this skim is intended for trigger studies, I think will good to not ask anything about the trigger bit in the skim,
>> probably just Id==11 will be good. I have skimmed the converted root files with only id=11 requirement, and in total for 2219 and 2220 I
>> ended up with 70K events.
>> 
>> Rafo
>> 
>> 
>> 
>>> On 01/05/2018 04:42 PM, Valery Kubarovsky wrote:
>>> Dear FX,
>>> 
>>> For trigger study we need to select events with at least one negative time based track with good xi2, if you have such parameter.
>>> 
>>> Regards,
>>> Valery.
>>> 
>>>> On Jan 5, 2018, at 14:13, Francois-Xavier Girod <fxgirod at jlab.org> wrote:
>>>> 
>>>> 
>>>> Dear all
>>>> 
>>>> One number I found from skimming runs 2219 and 2220 with random trigger (negative outbending)
>>>> The condition for skimming those events are
>>>> - at least one sector with electron trigger bit
>>>> - and either one particle with PID==11 or at least one negative time based track
>>>> Out of 184M events I found 7.5k events passing both above cuts
>>>> 
>>>> Best regards
>>>> FX
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>> 
> 
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