论文标题
在物理限极限制的2+1+1味晶格QCD的核子的Gluon Parton分布
Gluon Parton Distribution of the Nucleon from 2+1+1-Flavor Lattice QCD in the Physical-Continuum Limit
论文作者
论文摘要
我们使用pseudo-pdf方法介绍了第一个物理限制$ x $依赖性的核子gluon gluon分布，该方法是在晶格合奏中，具有$ 2+1+1+1 $ $改进的交错夸克（HISQ）的口味，由MILC协作产生。我们在三个晶格间距$ a \ 0.9 $，0.12和0.12和0.15〜fm和三个pion质量上使用三叶草费米子和三个质量质量$m_π\ 220 $，310 $，310和690〜MEV，核子两点测量值高达$ o（10^6）$（10^6）$和nucleon boost boost boost up tomea，我们研究了从晶格计算中获得的伪-ITD矩阵元件的晶格间距和静脉质量依赖性，然后在提取$ xg（x）/\ langle x \ rangle_g $之前将它们推断到连续体形态极限。我们使用从同一集合计算出的Gluon动量分数$ \ langle x \ rangle_g $来确定第一次通过lattice-qccd模拟完全通过lattice-qccd模拟来确定nucleon gluon unarlized pdf $ xg（x）$。我们将结果与以前的单一晶格计算以及选定的全局拟合进行了比较。
We present the first physical-continuum limit $x$-dependent nucleon gluon distribution from lattice QCD using the pseudo-PDF approach, on lattice ensembles with $2+1+1$ flavors of highly improved staggered quarks (HISQ), generated by MILC Collaboration. We use clover fermions for the valence action on three lattice spacings $a \approx 0.9$, 0.12 and 0.15~fm and three pion masses $M_π\approx 220$, 310 and 690~MeV, with nucleon two-point measurements numbering up to $O(10^6)$ and nucleon boost momenta up to 3~GeV. We study the lattice-spacing and pion-mass dependence of the reduced pseudo-ITD matrix elements obtained from the lattice calculation, then extrapolate them to the continuum-physical limit before extracting $xg(x)/\langle x \rangle_g$. We use the gluon momentum fraction $\langle x \rangle_g$ calculated from the same ensembles to determine the nucleon gluon unpolarized PDF $xg(x)$ for the first time entirely through lattice-QCD simulation. We compare our results with previous single-ensemble lattice calculations, as well as selected global fits.
