[Hallc_sidis_analysis] [EXTERNAL] CSV abstract for DIS 2023

[bosted at jlab.org]

Hi Whitney,
   I suggest to modify your abstract to include proton (measured at 8 of the
16 kinematic settings, so pretty significant). With 4 measurements,
and three ratios, it is possible to fit for 4 parameters, assuming
factorization but not charge symmetry in FF. Ignoring sea quarks,
one has to choose among these six:
u -> pi+
u -> pi-
d -> pi+
d -> pi-
delta u
delta d
at any given value of (x,Q2,z). However, by assuming that
delta u and delta depend only on x, and the four FF only on
z more or less, one can fit all six.
   This analysis does need to assume that the differences in
pt-slopes are not significant for pt<0.25, and that the cos(phi)
terms can be integrated out, and that factorization is valid
in a limited region of pt.
   Hem is busy reproducing my results for 6 of these kinematic
settings: I think we are very close now.
   Recall that one of the most widely used FF sets (DSS), notes
in their paper that if they force the two "favored" FF to be
equal, the chi2 for their global fit is much worse than if
they allow u->pi+ and d->pi- to differ.
   In conclusion, maybe you can and "and fragmentation function"
to your title, change deuteron to proton and deuteron, and a few
little other changes?
   Of course, one should always mention that the data will most
useful when added to the world data set, especially neutrino data.
   Yours, Peter

> Hi Everyone,
>
> I would like to submit an abstract to DIS2023 for the CSV experiment.
> Attached is the abstract. Any feedback would be appreciated.
>
> Cheers,
> Whit
>
>
>
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