Double parton distributions in the nucleon from lattice QCD

被引：7

作者：

Bali, Gunnar S. ^{[1
,2
]}

Diehl, Markus ^{[3
]}

Glaessle, Benjamin ^{[4
]}

Schaefer, Andreas ^{[1
]}

Zimmermann, Christian ^{[1
]}

机构：

[1] Univ Regensburg, Inst Theoret Phys, D-93040 Regensburg, Germany

[2] Tata Inst Fundamental Res, Dept Theoret Phys, Homi Bhabha Rd, Mumbai 400005, Maharashtra, India

[3] Deutsches Elektronen Synchrotron DESY, Notkestr 85, D-22607 Hamburg, Germany

[4] Univ Tubingen, Zentrum Datenverarbeitung, Wachterstr 76, D-72074 Tubingen, Germany

来源：

JOURNAL OF HIGH ENERGY PHYSICS | 2021年 / 2021卷 / 09期

基金：

欧盟地平线“2020”;

关键词：

Lattice field theory simulation; QCD Phenomenology; CHARGE-DISTRIBUTIONS; HADRON STRUCTURE; SCATTERING; EQUATIONS; PROBE;

D O I：

10.1007/JHEP09(2021)106

中图分类号：

O412 [相对论、场论]; O572.2 [粒子物理学];

学科分类号：

摘要：

We evaluate nucleon four-point functions in the framework of lattice QCD in order to extract the first Mellin moment of double parton distributions (DPDs) in the unpolarized proton. In this first study, we employ an n(f) = 2+1 ensemble with pseudoscalar masses of m(pi) = 355 MeV and m(K) = 441 MeV. The results are converted to the scale mu = 2 GeV. Our calculation includes all Wick contractions, and for almost all of them a good statistical signal is obtained. We analyze the dependence of the DPD Mellin moments on the quark flavor and the quark polarization. Furthermore, the validity of frequently used factorization assumptions is investigated.

引用

页数：75

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