Nucleon transverse quark spin densities

2022/10/11 by Alexandrou, Constantia, Bacchio, Simone, Constantinou, Martha +9
#FOS: Physical sciences #High Energy Physics - Lattice (hep-lat) #High Energy Physics - Phenomenology (hep-ph) #Nuclear Theory (nucl-th)

paper · doi:10.48550/arxiv.2210.05743

Abstract

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∼ 0.08~fm, a∼ 0.07~fm and a∼ 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∼ 0.08~fm for which we include the disconnected contributions.

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