[Primex2] CD-2015, an updated version

[gasparan at jlab.org]

  Hi Beni,

 Thanks for your comments, here are some answers:
 There is a 10 page limit for this submission, I am on the last
 line already otherwise I think you are right.

 The preliminary result is average for 12C and 28Si, with statistics
 combined (Ilya may correct me) but, for the systematic errors we
 do not add them from two targets. In text we say that the total
 systematic error is a quadratic sum of individual items like errors
 from the photon number counting, target number, event selection ....
 It is not sum from two target results.

 About the photon number in the experiment: the photon flux is not
 right thing for this case since the definition (the book) of flux is
 number of photons per unit area per unit time. So, we could use
 something like "integral photon number passed through the target
 during the experiment".

 Thanks,
 Ashot


> Hi Ashot,
>
> it would be quite informative for the reader if the results for the
> carbon target and the silicon target
> are presented separately. Also it is not clear to me that adding the
> systematic uncertainties of the two
> results in quadrature is the correct approach. If "number of photons"
> refers to the photon flux then this
> is presumably the same for both measurements and adding this part in
> quadrature does not make sense.
> However, I am not familiar with the details of the analysis so I may be
> wrong of course.
>
> cheers,
> Beni
>
>
>>    Dear PrimEx-II collaborators,
>>
>>   Here is a slightly updated version of the CD-2015 text.
>>   It includes suggestions I received so far.
>>
>>   Please take a look.
>>
>>   Thanks,
>>   Ashot
>>
>>
>> _______________________________________________
>> Primex2 mailing list
>> Primex2 at jlab.org
>> https://mailman.jlab.org/mailman/listinfo/primex2
>
> _______________________________________________
> Primex2 mailing list
> Primex2 at jlab.org
> https://mailman.jlab.org/mailman/listinfo/primex2
>