[Clascomment] OPT-IN: Resolving the proton form factor problem by comparing electron and positron scattering from the proton

[Larry Weinstein]

Dear Mikhail,

1) We modified the text to read:

    The cross section ratio $R$ was measured for each bin. It was then
    divided by a radiative correction factor equal to the ratio of the
    $e^+p$ and $e^-p$ radiatively corrected  cross sections  calculated
    in the modified peaking approximation \cite{ent01} and averaged over
    each bin by  Monte Carlo integration.

2) The data points are located at the data-weighted center of each bin.  
The bin extent for the Q^2=1.45 data can be seen in figure 2. For 
example, the data point for the bin extending in epsilon from 0.2 to 0.5 
is located at 0.4.

Mikhail Osipenko wrote:
> Dear Authors of TPE paper,
>
> I have a couple of questions:
>
> in page 4 first paragraph - you probably wanted to state that you have made Monte Carlo simulations of two radiative cross sections (for e+ and e-) over entire kinematics of the bin and then took the ratio of these cross sections? As it is written now it looks like you did some kind of strange average of correction factor \delta_brem over the Q2 range from 1 to 4 GeV^2.
>
> In Figs.3 and 4 you don't provide the horizontal bin bars, is the data corrected for bin-centering somehow?
>
> Best Regards,
>                 Mikhail.

-- 
				Sincerely,
				Larry

-----------------------------------------------------------
Lawrence Weinstein
University Professor
Physics Department
Old Dominion University
Norfolk, VA 23529
757 683 5803
757 683 3038 (fax)
weinstein at odu.edu
http://www.lions.odu.edu/~lweinste/

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