论文标题
核子横向夸克自旋密度
Nucleon transverse quark spin densities
论文作者
论文摘要
我们介绍了从非极化和横向概括的形式因素提取的细胞核横向夸克旋转密度的梅林力矩的计算。我们使用三个$ n_f = 2+1+1 $ twisted质量费米子的组合，并调整了其物理价值和晶格间距$ a \ sim 0.08 $ 〜fm，$ a \ sim 0.07 $ 〜fm和$ a \ sim 0.06 $ 〜FM，并将其置于连续量限制。除了同源器密度外，我们还使用$ a \ sim 0.08 $ 〜fm的合奏为每种夸克风味的张量费用还包括张量，我们为此包括了脱节的贡献。
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.
