[Hadstruct] Minutes of 5/19/2021

[David Richards]

Gluon distribution

TK gave an update on the gluon distribution, and the (small effect) of adding different terms to the parametrization.

Note we have several versions of the Jacobi-fitting procedure - in C++ and as a python notebook - which we should probably distribute.

There was some discussion of the data sharing, following a request from Xiangdong Ji. RE noted from the HadSpec experience that it was important to have a written down (and published?) DMP.

One question is the calculation of the momentum fraction, in RI-MOM scheme. CM pointed to the ETMC ETMC paper<https://arxiv.org/abs/1611.06901>. Probably should be a separate paper. TK showed some updates to the gluon momentum fraction as a function of the flow time, which exhibited a weak flow-time dependence in contrast to the strong perturbative flow-time dependence based on the experimental value of the gluon momentum-fraction.  here<https://arxiv.org/abs/1805.00531>

<https://github.com/JeffersonLab/HadStruc/wiki/Minute-of-May-19#transversity-distribution>Transversity distribution

There was some discussion about whether we should compute the renormalization constants for gT. Should be mass independent, and we could just quote the value on the ensembles for which they are not directly computed as a systematic uncertainty of order 1%.

<https://github.com/JeffersonLab/HadStruc/wiki/Minute-of-May-19#aob>AOB
Note that the CNF seminars were now at 10am. We will maintain the 9am schedule (as a form of imposing self-discipline!) but may more forward to 830am in the future.

<https://github.com/JeffersonLab/HadStruc/wiki/_new?wiki%5Bname%5D=_Footer>
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