Moments of the nucleon transverse quark spin densities using lattice QCD

We present the first calculation of the Mellin moments of the transverse quark spin densities in the nucleon using lattice QCD simulations with physical values of the pion mass and in the continuum limit. Specifically, we use three

N_{f} = 2 + 1 + 1

twisted mass fermion gauge ensembles each at different lattice spacings. The densities are extracted from the unpolarized and transversity generalized form factors. The first moment of transversely polarized quarks in an unpolarized nucleon shows an interesting distortion, which can be traced back to the sharp falloff of the transversity generalized form factor

{\bar{B}}_{T n 0} (Q^{2})

. The isovector tensor anomalous magnetic moment is determined to be

κ_{T} = 1.051 (94)

, which confirms a negative and large Boer-Mulders function,

h_{1}^{⊥}

, in the nucleon.

quark: spin: transverse
quark: spin: density
spin: density
fermion: mass: twist
quark: mass
nucleon
lattice field theory
transversity
form factor
magnetic moment

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