[Primex] the latest version of the prl paper

[Ashot Gasparian]

    Dear Aron,

  We had a very active and exceptionally productive pi0 paper meeting on
  Thursday, July 1th, (the minutes are on the website also) with a high
  level representation of different groups in the PrimEx. I remember we had
  long discussions of both questions you are raising in this letter.

  If I am not mistaken, particular decisions (by simple majority agreements)
  were made on those questions.

  There we decided that it is not our task in this PRL paper
  to judge about the work of others, including the PDG work also.
  In particular we agreed to show the "QCD sum rules" based Ioffe
  calculation, without questioning its value. We may do that in a
  separate publication, if there are enough arguments for it.

  About the Table I: we made a particular agreement/decision in that
  meeting to have this table in this article. Also, I asked Dustin
  to provide his coefficients for the table, there is no problem in
  that at all.

  Ashot




.............................................................
Ashot Gasparian                    Phone:(336)285-2112 (NC A&T)
Professor of Physics
Physics Department                       (757)-269-7914 JLab
NC A&T State University              Fax:(757)-269-6273 JLab
Greensboro, NC 27411               email: gasparan at jlab.org
.............................................................


On Fri, 9 Jul 2010, Aron Bernstein wrote:

> Dear Ashot and all,
>
> 1)  Drop table 1. The values are from Ilya and not average as is stated in the text. Furthermore the values of C_NC are dependent on the form of the incoherent cross sections (Tulio or Sergey) although the value of Gamma is not.  The quantities in the table are not well defined in the text and their meaning is not clear. What is important is the relative contributions of each of the contributing cross sections. This is presented in the cross section figures and not commented on in the text. The main point of the PRL is to present the value of Gamma and the other quantities should be dealt with in a later, more detailed publication.
>
> 2)  Fig. 1. Include the particle data book average, as well as the e+e- result which is not included in the average for completely unknown reasons.
>
> I do not think that the QCD sum rule result should be shown in the figure. It is a model calculation and not on the same QCD level as the other chiral calculations. Furthermore the fact that it is lower then the other calculations is due to the fact that it does not properly include the eta-prime contribution. We have verified this by turning off this contribution and this is the result that is obtained in this case.  All of the authors of the theoretical papers were at the chiral dynamics meeting last summer in Bern and I discussed this issue with all of them. I am reporting the opinion of all of them. Clearly Ioffe is a respected theorist and his paper should be quoted and discussed.
>
> I would like to discuss these two points on Monday.
>
> Regards,
> Aron
>
> PS. Please use my middle initial A.M. Bernstein in the list of authors and in ref. 6.
>
>
> Aron M. Bernstein
> Professor of Physics
> MIT
> Cambridge, MA. 02139
> office: 26-419
> phone: 617-253-2386
>
>
>
>
>
>
> On Jul 9, 2010, at 12:45 PM, Ashot Gasparian wrote:
>
>>
>>  Dear PrimEx Collaborators,
>>
>>  The latest version of the PRL draft is in the attachment.
>>  It includes the most of suggestions done before yesterday
>>  (Thursday) evening and it is formatted to fit 4 pages (it
>>  was not an easy work).
>>
>>  This version does not include suggestions and comments received
>>  from this morning (Friday). Many of them are very valuable
>>  and we will try to implement them in the text.
>>
>>  Please keep commenting on the draft before Monday's Collaboration
>>  meeting, where we intend to finalize the most part of the paper.
>>
>>  Regards,
>>  Ashot
>>
>>
>> .............................................................
>> Ashot Gasparian                    Phone:(336)285-2112 (NC A&T)
>> Professor of Physics
>> Physics Department                       (757)-269-7914 JLab
>> NC A&T State University              Fax:(757)-269-6273 JLab
>> Greensboro, NC 27411               email: gasparan at jlab.org
>> .............................................................
>> <pi0_prl_draft_10.pdf>_______________________________________________
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>
>