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arXiv 2008.12474hep-phhep-latnucl-th
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基于格点量子色动力学的核子层析成像和物理π质量下的广义部分子分布

Nucleon Tomography and Generalized Parton Distribution at Physical Pion Mass from Lattice QCD

Huey-Wen Lin

摘要:

利用MILC协作组生成的2+1+1味高度改进的交错夸克(HISQ)的晶格系综,首次计算了物理π质量下的核子等矢非极化广义部分子分布(GPD),晶格间距$a\approx 0.09$ ~fm,体积$64^3\times 96$ .我们使用动量涂抹源,以提高在核子助推动量$P_z \approx 2.2$ GeV的信号,并报告结果在非零动量转移$[0.2,1.0]\text{ GeV}^2$。在与光锥GPD匹配之前,采用RI/ESTA方案中的非微扰重整化来获得准分布。给出了$ξ=0$的三维分布$H(x,Q^2)$和$E(x,Q^2)$,以及在$\overline{\text{MS}}$方案中,在$μ=3$ GeV上对选定的Bjorken $x$的三维核子层析成像和与碰撞参数相关的分布。

英文摘要:

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.

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