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Nucleon transverse quark spin densities

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arxiv 2210.05743 v1 pith:5Y3HVZWA submitted 2022-10-11 hep-lat hep-phnucl-th

Nucleon transverse quark spin densities

classification hep-lat hep-phnucl-th
keywords quarkdensitiesfactorsformincludenucleonspintransverse
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We present a calculation of the Mellin moments of the nucleon transverse quark spin densities extracted from the unpolarized and transversity generalized form factors. We use three $N_F=2+1+1$ ensembles of twisted mass fermions with quark masses tuned to their physical values and lattice spacings $a\sim 0.08$~fm, $a\sim 0.07$~fm and $a\sim 0.06$~fm and extrapolate the form factors to the continuum limit. Besides isovector densities we also include results for the tensor charge for each quark flavor using the ensemble with $a\sim 0.08$~fm for which we include the disconnected contributions.

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