[Clascomment] OPT-IN: phi-meson photoproduction on Hydrogen in the neutral decay mode

[Amaryan, Moskov]

Dear Jean-Marc,

The slope \beta on the right panel in Fig.13 is defined in the first paragraph of subsection C. Total cross section of section IV.
Our results are compared with existing data from other facilities. Similarly, the slope called B_{\phi} in the charged channel paper by CMU,
presented in Fig.25 is very much compatible with our result being in the range of 3-4 GeV^{-2}, peaking around \sqrt{s}=2.1 GeV.
Nowhere we have seen the slope of the cross section d\sigma/dt around 6GeV^{-2}, could you be more specific, please?
One can call the y-axis of the left panel as the amplitude, but the slope (right panel)  is  the slope of the t-dependence of differential
cross section, why should we call it the slope parameter of the diffractive amplitude?

Best regards,
Moskov.


On May 29, 2013, at 12:37 PM, Jean-Marc Laget wrote:

Dear Lead Authors,

In Figure 13, the slope parameter is certainly meant to be the slope parameter of the diffractive amplitude and not the slope parameter of the differential cross section, which according to previous experiments ranges around 6 GeV^2 (instead of 3).

In order to prevent confusion for the reader, I strongly suggest to:

1- Plot the slope parameter of the cross section, as it is usually done;

2- Define the meaning of "beta", even if you decide to stick to the present format of figure 13.

In the comparison with previous data, I do not understand why you do not include the latest CLAS charged decay mode results (CMU analysis) which are in the final stage of the review by the collaboration. Both analysis use the same data set and I guess that the author list will be quite similar. Also both papers will end up as a CLAS collaboration publication!!

All the best,

JM

---------------------------------------------------------
Moskov Amaryan
Professor of Physics
College of Sciences
Old Dominion University
4600 Elkhorn Avenue
Norfolk, VA 23529
757-623-5579 (phone)
757-623-3038 (fax)
mamaryan at odu.edu<mailto:mamaryan at odu.edu>
http://www.lions.odu.edu/~mamaryan





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