[clas_members] FW: Acceptance CY10296 Khetarpal

Hicks, Kenneth hicks at ohio.edu
Tue Apr 2 14:26:25 EDT 2013

Dear CLAS Members,

And another paper accepted!  Congratulations to Puneet and collaborators.


> From: prc at aps.org
> Subject: Acceptance CY10296 Khetarpal
> Date: April 2, 2013 1:26:52 PM EDT
> To: puneetk at jlab.org
> Reply-To: prc at aps.org
> Re: CY10296
>    Near-threshold neutral pion electroproduction at high momentum
>    transfers and generalized form factors
>    by P. Khetarpal, P. Stoler, I. G. Aznauryan, et al.
> Dear Dr. Khetarpal,
> We are pleased to inform you that your manuscript has been accepted 
> for publication as a Regular Article in Physical Review C.  We would 
> also like to bring the appended referee comments to your attention.
> Your manuscript will now be prepared for the production process.  If 
> any issues arise we will contact you, otherwise your manuscript will 
> be forwarded directly to our production department.  Please do not 
> send a revised manuscript or figures at this time unless requested.
> Yours sincerely,
> Bradley W. Filippone
> Associate Editor
> Physical Review C
> Email: prc at ridge.aps.org
> http://prc.aps.org/
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> P.S. We regret the delay in the review process.
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> ----------------------------------------------------------------------
> Report of the Referee -- CY10296/Khetarpal
> ----------------------------------------------------------------------
> The paper describes comprehensively the measurement of the near 
> threshold neutral pion electroproduction cross-section ep ⇒ e’pπ0 
> using the CLAS detector at Jefferson Lab. The associated structure 
> functions on the proton are determined in the kinematic range of Q2 
> from 2 to 4.5 GeV2 and W from 1.08 to 1.16 GeV.
> The description of the experiment and the analysis of data is first 
> rate. The agreement between data and simulation at the peak of the Δ 
> resonance is impressive.
> The reduced cross-section can be expanded in terms of sum over the 
> contributions from the hadronic structure functions σT, σL, σTT, and 
> σLT and kinematic factors. The structure functions σi can be written 
> in terms of the helicity amplitudes Hi, which can be further expanded 
> in terms of the multipole amplitudes E0+, S0+, M1±, S1±, and E1+. The 
> S-wave multipoles E0+ and S0+ are determined and compared to the 
> predictions of the light-cone sumrule (LCSR) framework. In the low Q2 
> < 1 GeV2 regime and chiral limit mπ⇒0, the S-wave multipoles at 
> threshold can be written in terms of electromagnetic form factors for 
> the neutral pion-proton channel: Gπ0p1 and Gπ0p2.
> The paper concludes that the E0+ multipole and Gπ0p1 are in good 
> agreement with the LCSR prediction. However, the theoretical agreement 
> with the extracted value of Gπ0p2 is poor.
> It is clear that this paper provides high quality, new data that 
> provide strong constraints on chiral aspects of nucleon structure. It 
> is well written. I recommend publication without revision.

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