论文标题
Nucleon Isovector结构的矩$ 2+1+1 $ -Flavor QCD
Moments of nucleon isovector structure functions in $2+1+1$-flavor QCD
论文作者
论文摘要
我们介绍了等异位动量分数,$ \ langle x \ rangle_ {u-d} $,螺旋力矩,$ \ langle x \ rangle_ {ΔU-Δd} $,terranse trange x \ langle x \ rangle x \ rangle x \ rangle_ {ΔU-ΔD} MILC合作使用$ 2+1+1 $ -Flavors的动态高度改进的交错夸克(HISQ)。相关函数是使用Wilson-Clover动作计算的,三个操作员的重新归一化是在Ri $ {}^\ Prime $ -Mom方案中的晶格上非扰动进行的。该数据已在晶格间距$ a \ a \ aft 0.15,\ 0.12,\ 0.09,$和0.06 fm和$m_π\ 310,\ 220 $和135 meV中收集,它们用于使用同时的chiral-Continuum-continuum-finite-finite-finite-finite-finite-volume-volume Fit。 $ \ + edline {ms} $方案中的最终结果是$ \ langle x \ rangle_ {u-d} = 0.173(14)(07)$,$ \ langle x \ rangle_ {ΔU-Δd} = 0.213(15)$ and $ x; 0.208(19)(24)$,其中第一个误差是整体分析不确定性,第二个误差是由于可能的残留激发态贡献而导致的额外系统不确定性。这些结果与其他最近的晶格计算和现象学全球拟合值一致。
We present results on the isovector momentum fraction, $\langle x \rangle_{u-d}$, helicity moment, $\langle x \rangle_{Δu-Δd}$, and the transversity moment, $\langle x \rangle_{δu-δd}$, of the nucleon obtained using nine ensembles of gauge configurations generated by the MILC collaboration using $2+1+1$-flavors of dynamical highly improved staggered quarks (HISQ). The correlation functions are calculated using the Wilson-Clover action and the renormalization of the three operators is carried out nonperturbatively on the lattice in the RI${}^\prime$-MOM scheme. The data have been collected at lattice spacings $a \approx 0.15,\ 0.12,\ 0.09,$ and 0.06 fm and $M_π\approx 310,\ 220$ and 135 MeV, which are used to obtain the physical values using a simultaneous chiral-continuum-finite-volume fit. The final results, in the $\overline{MS}$ scheme at 2 GeV, are $\langle x \rangle_{u-d} = 0.173(14)(07)$, $\langle x \rangle_{Δu-Δd} = 0.213(15)(22)$ and $\langle x \rangle_{δu-δd} = 0.208(19)(24)$, where the first error is the overall analysis uncertainty and the second is an additional systematic uncertainty due to possible residual excited-state contributions. These results are consistent with other recent lattice calculations and phenomenological global fit values.