We present results on the nucleon tensor form factors and first moment of the transversity distribution using maximally twisted mass fermions. We analyze two Nf=2+1+1 ensembles having pion masses of 213 MeV and 373 MeV with lattice spacing a=0.064 fm and a=0.082 fm, respectively. First results using an Nf=2 ensemble of twisted mass fermions with a clover term at a physical pion mass and lattice spacing a=0.094 fm are also presented. The renormalization function for the local tensor form factors is evaluated non-perturbatively with a perturbative subtraction of O(a^2)-terms, while for the first moment of the transversity we use a perturbative estimate. Results are given in the MS-bar scheme at a scale of mu=2 GeV, and are compared with recent results obtained using different discretization schemes.
@article{arxiv.1311.4670,
title = {Nucleon transversity generalized form factors with twisted mass fermions},
author = {Constantia Alexandrou and Martha Constantinou and Karl Jansen and Giannis Koutsou and Haralambos Panagopoulos},
journal= {arXiv preprint arXiv:1311.4670},
year = {2013}
}
Comments
7 pages, 5 figures, talk presented at the 31st International Symposium on Lattice Field Theory - Lattice 2013, Mainz, Germany