[Primex2] Compton result from Li

[Gan, Liping]

Hi, Pawel and Ilya,

Li demonstrated in his  presentation on last Friday that the fluctuation in his extracted Compton cross section might be caused by MC simulation sample. I think that it is very important. Would you please take a close look at his presentation? I would suggest to investigate the MC simulation as soon as possible.

Cheers,
Liping



From: Primex2 [mailto:primex2-bounces at jlab.org] On Behalf Of li ye
Sent: Friday, February 12, 2016 3:03 PM
To: Yang Zhang
Cc: primex2 at jlab.org
Subject: Re: [Primex2] PrimEx-II analysis meeting reminder

Hi powel , Ilia ,
Please take a look the slides I have for todays meeting .
 I use the Tfraction fitter to fit the data and get the cross section result,  the fitting is much better ,
but I still have some jump for the cross section , so I checked the calculation all over again and found a problem.

in the simulation  in my understanding ,the N-input for each Echannel  should be like :
cross-theory  =  Yield-mc / (const * flux * Acc )    where const is constant from target information , Acc is acceptance  =  Yield-mc / N-input  ,
so   cross-theory = Yield-mc *(N-input/Yield-mc) /(const*flux)
      cross-theory =    N-input /(const*flux)
     N-input = const*flux*cross-theory

means N-input should proportional to the cross-theory
but if you check the last slides plot , the N-input number I got looks not right behavior .
Please correct me if i am wrong .
Yang , would you please also check the simulation input / flux for pi0 ? see if it is mach the theory shape ?

Cheers
Li

2016-02-11 22:18 GMT-05:00 Yang Zhang <yzhang132 at gmail.com<mailto:yzhang132 at gmail.com>>:
Dear collaborators,

We'll have our weekly meeting on February 12th, this Friday afternoon at 1:30pm in F227.

please log onto https://jlab.bluejeans.com/2265619819/ to view the sharing. And Make sure your microphone and speaker are ok before entering our meeting.

You can also dial phone number +1 888-240-2560<tel:+1%20888-240-2560> to join the meeting with meeting ID 2265619819<tel:2265619819>.

Meeting webpage:
http://wwwold.jlab.org/primex/weekly_meetings/primexII/slides_2016_02_12

Directory for your presentation files:
/group/primex/html/weekly_meetings/primexII/slides_2016_02_12
Best
Yang

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