[Eg6_analysis] meeting

[hattawy]

Hello Stepan, Hovanes and all,
    I made these slides for us to discuss more about the results. Most 
probably i will present the coherent channel in details and point out 
the final asymmetries of the incoherent channel (Hovan, i will do my 
best to put also the measured asymmetries from e1dvcs experiment). 
Thanks a lot for both of you for your comments, i will take them into 
account in my presentation during the collaboration meeting.

    Stepan, regarding you questions, yes these eHepi0(1gamma) events pass 
the exclusivity cuts which are defined from the simulated coherent dvcs 
events. For the background subtraction, yes i subtract the number of the 
experimental pions multiplied by the contamination ratio from the number 
of DVCS events in each helicity (+/-). For these i just take the value 
of R in each bin t assuming there is no big variation in phi. I think 
this is a good assumption? see slide 34, i extracted the contamination 
ratio in two dimensional bins ( t, phi) for the incoherent channel.

   I would like to arise the status of the incoherent channel and the 
shifts we see in the experimental data ( slide number 28). Nathan, can 
you run your code to check if you will see these shifts? you dont need 
full data, it will be clear from running over 10% of the data.


Regards,
Mohammad.



On 2015-02-14 17:13, Stepan Stepanyan wrote:
> Hello Mohammad,
> 
>  Nice collection of slides. I assume they will become your talk in few
> days.
>  From way things are presented I am not sure I understand if you will
> talk
>  about incoherent analysis or only on coherent DVCS analysis and will
> show
>  results on both.
>  Some specific comments on the slides:
>  - slide 4, the formula for observable is not visible, at list on my
> computer.
>  It looks like you inserted a formula as a picture (jpeg, gif, png
> ...). You need
>  to make it visible, either type it in in power point or in latex and
> import
> 
>  - slide 9, can you chose another symbol for chi^2, it looks X^2.
> 
>  - slide 16, explaining pi0 subtraction by itself is not simple, but
> when you write
>  both e4Hepi0/eppi0, it gets even more complicated. I suggest to drop
> eppi0
>  part and explain everything for e4Hepi0, then have a sentence below
> that the
>  same technique is used for eppi0
>  Also, bullets are not so clear, here are some questions:
>  (a) are the events in the nominator of the ratio R, e4Hepi0(1gamma),
> are the ones
>  that will pass the exclusivity cuts?
>  (b) how you exactly subtract pi0 events, are you subtracting number
> of pi0s from DVCS
>  sample for each (Q2, x, t, phi) bin. Are there enough pi0 events
> (where both photons
>  are detected) to do such subtraction?
> 
>  - slide 17, will be good to have a slide before this one showing
> (gammagamma)
>  invariant mass distribution for all combinations (ICIC, ICEC, ECEC)
> showing
>  pi0 and applied cuts
> 
>  - slides 21 and 22, are you going to fit these points with some phi
> dependent (sin/cos) function?
> 
>  Stepan
> 
> On 2/14/15 6:30 AM, hattawy wrote:
> 
>> Hello Stepan and all,
>> Here i attached a pdf file in which i collected all up to date
>> results of my analysis.
>> The coherent channel shows a good agreement with the simulation. On
>> the side of the incoherent channel, we still have the issue of the
>> shifts in the missing mass squared of ep and egamma, see slide
>> number 28 for the comparison between the simulated and the
>> experimental incoherent DVCS. Please let me know if you have any
>> suggestions or comments.
>> 
>> Best regards,
>> M. Hattawy.
>> 
>> On 2015-02-11 13:03, Nathan Baltzell wrote:
>> 
>>> Hello Everyone,
>>> 
>>> We will have our weekly meeting TODAY, February 11, at 10:00 in
>>> TED2547.
>>> 
>>> Add to the agenda:
>>> 
>> 
> https://clasweb.jlab.org/rungroups/lowq/wiki/index.php/Meeting_on_February_11,_2015_@_10:00AM
>>> [1]
>>> 
>>> Bluejeans meeting instructions:
>>> 
>>> URL:
>>> https://bluejeans.com/151158041/ [2]
>>> 
>>> Dial In:
>>> +1 408 740 7256 or +1 888 240 2560
>>> then the meeting ID followed by #:
>>> 151158041##
>>> 
>>> -Nathan
>>> _______________________________________________
>>> Eg6_analysis mailing list
>>> Eg6_analysis at jlab.org
>>> https://mailman.jlab.org/mailman/listinfo/eg6_analysis [3]
>> 
>> _______________________________________________
>> Eg6_analysis mailing list
>> Eg6_analysis at jlab.org
>> https://mailman.jlab.org/mailman/listinfo/eg6_analysis [3]
> 
> 
> 
> Links:
> ------
> [1]
> https://clasweb.jlab.org/rungroups/lowq/wiki/index.php/Meeting_on_February_11,_2015_@_10:00AM
> [2] https://bluejeans.com/151158041/
> [3] https://mailman.jlab.org/mailman/listinfo/eg6_analysis
> 
> _______________________________________________
> Eg6_analysis mailing list
> Eg6_analysis at jlab.org
> https://mailman.jlab.org/mailman/listinfo/eg6_analysis