论文标题
核子断层扫描和晶格QCD物理锥质量的广义分布分布
Nucleon Tomography and Generalized Parton Distribution at Physical Pion Mass from Lattice QCD
论文作者
论文摘要
我们使用一个晶格质量合奏，介绍了物理锥度质量的核子等异源质量的第一个晶格计算，该晶格合奏具有2+1+1个口味的高度改进的交错夸克（HISQ），由米尔克协作产生，并在晶格间隔$ a \ a \ a \ 0.09 $ 〜fm〜fm〜fm〜fm和64 $ 64^344^344^3.36 $ a^$ a flattice Spacing $ a flattice合作产生。我们使用动量 - 敏化来源来改善核子增强动量$ P_Z \约2.2 $ GEV处的信号，并以$ [0.2,1.0] \ text {gev}^2 $报告非零动量传输的结果。在与LightCone GPD匹配之前，使用RI/MOM方案中的非扰动重归其化来获得准分布。提出了三维分布$ h（x，q^2）$和$ e（x，q^2）$ at $ξ= 0 $，以及三维的核核酸层造影术和影响 - 参数依赖于所选的bjorken $ x $ x $ $ x $ x $ x $ x $ x $ x $μ= 3 $ gev in $ \ \\ overline $ \ \ \ fextline {ms texch} $ concepent {ms fext {ms {ms
We present the first lattice calculation of the nucleon isovector unpolarized generalized parton distribution (GPD) at the physical pion mass using a lattice ensemble with 2+1+1 flavors of highly improved staggered quarks (HISQ) generated by MILC Collaboration, with lattice spacing $a\approx 0.09$~fm and volume $64^3\times 96$. We use momentum-smeared sources to improve the signal at nucleon boost momentum $P_z \approx 2.2$ GeV, and report results at nonzero momentum transfers in $[0.2,1.0]\text{ GeV}^2$. Nonperturbative renormalization in RI/MOM scheme is used to obtain the quasi-distribution before matching to the lightcone GPDs. The three-dimensional distributions $H(x,Q^2)$ and $E(x,Q^2)$ at $ξ=0$ are presented, along with the three-dimensional nucleon tomography and impact-parameter--dependent distribution for selected Bjorken $x$ at $μ=3$ GeV in $\overline{\text{MS}}$ scheme.
