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Generalized Parton Distribution Functions of $\rho$ meson
by Baodong Sun and Yubing Dong
This is not the current version.
Submission summary
As Contributors:  Yubing Dong 
Preprint link:  scipost_201910_00011v1 
Date submitted:  20191014 02:00 
Submitted by:  Dong, Yubing 
Submitted to:  SciPost Physics Proceedings 
Proceedings issue:  24th European Few Body Conference (University of Surrey, U.K.) 
Academic field:  Physics 
Specialties: 

Approach:  Theoretical 
Abstract
We report our recent calculations for the generalized parton distribution functions of the $\rho$ meson with the help of a lightfront constituent quark model. The electromagnetic form factors and structure functions of the system are given. Moreover, we also show our results for its gravitational form factors (or energymomentum tensor form factors) and for other mechanical properties, like its mass distributions, pressures, shareforces, and $D$term.
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Submission & Refereeing History
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Reports on this Submission
Anonymous Report 1 on 20191120 (Invited Report)
 Cite as: Anonymous, Report on arXiv:scipost_201910_00011v1, delivered 20191120, doi: 10.21468/SciPost.Report.1330
Report
This paper reports on calculations of generalized parton distribution functions, electromagnetic, electroweak, and energymomentum tensor form factors and other structure functions for the rho meson. The calculations are based on a phenomenological model for the rhoquarkantiquark vertex function in a constituent quark model. The momentum dependence of the vertex function is assumed to be of a particular functional form, depending on three parameters, one of which is fixed by a normalisation condition, whereas the other two are somehow "optimally selected" (no further details are given). It would clearly be more interesting to see results based on a dynamical calculation of the vertex function, but phenomenological results can still be useful for comparison purposes.
I think this paper merits publication. However, it should be improved in a few aspects:
1. Equation (13) shows the momentum dependence $\Lambda(...)$ of the rho vertex, but the sentences before and after the equation do not explain what the exact structure of the vertex really is. Is it simply $\Gamma^\mu(...)=\gamma^\mu \Lambda(...)$, or are there other Lorentz structures included?
Perhaps the sentence before (13), "... the phenomenological vertex $\Gamma^\mu$ equals to $\gamma^\mu$ plus the momentumdependent term of the parton..." is misleading, and what is meant is "multiplied by" instead of "plus". This should be clarified.
My remaining comments concern the formatting and grammar of the paper.
Formatting:
2. The figures 25 have really tiny labels, which makes them hard to read. If possible, they should be made bigger.
3. All figures consist of a left and a right panel. In the captions, the authors refer to them as "((a), left)" and "((b), right)", respectively. This is quite unusual and rather clumsy, and it could be improved very easily: just give the left and right panels their labels (a) and (b), and then one can refer to them simply as "(a)" and "(b)" instead of "((a), left)", etc.
Grammar:
In general, the text is full of grammatical errors, which are too numerous to list them here (articles, prepositions, ...). Nevertheless, it is possible to understand most of what is written, so I will list here only the cases I find most important.
4. Throughout the text, the authors write "share forces" instead of "shear forces".
5. In the 3rd paragraph of the Introduction,
"It is expected that future Jefferson Lab. would provide a more precise measurement..."
should be changed to something like
"It is expected that future Jefferson Lab experiments would provide a more precise measurement..."
6. The decomposition of the energymomentum tensor in Eq. (6) contains a mistake: the terms with $A_0(t)$ and $A_1(t)$ appear to be multiplied, but there should be some sign (probably a plus) between them.
7. The sentence "which stands for the fundamental property and is negative characterizing a stable system." after Eq. (10) is confusing. Do they mean "which stands for a fundamental property..."?
8. In the text before and after Eq. (13), the word "employ" is spelled "employe" twice.
I could go on with more examples, but perhaps the authors find somebody for a thorough proofreading of their text.