Lattice QCD Calculations of Transverse-Momentum-Dependent Soft Function through Large-Momentum Effective Theory
Lattice QCD Calculations of Transverse-Momentum-Dependent Soft Function through Large-Momentum Effective Theory
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基于大动量有效理论的横向动量相关软函数的格子QCD计算
DOI：
10.1103/physrevlett.125.192001
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发表时间：
2020
影响因子：
8.6
通讯作者：
Yang Yibo
中科院分区：
文献类型：
--
作者：
Zhang Qi-An;Hua Jun;Huo Yikai;Ji Xiangdong;Liu Yizhuang;Liu Yu-Sheng;Schlemmer Maximilian;Schafer Andreas;Sun Peng;Wang Wei;Yang Yibo
横向动量相关(TMD)软函数是Drell-yan和其他具有相对较小横向动量的过程的QCD分解的关键成分。我们用格子QCD研究了这一函数在中等大的快度下对风味CLS动态系综的影响。在大动量有效理论中，我们通过一个大动量转移的伪标量介子形状因子及其准TMD波函数来提取软函数的快度无关(或本征)部分。基于准TMD波函数的大动量演化，我们还研究了软函数的快度相关部分--Collins-Soper演化核。
The transverse-momentum-dependent (TMD) soft function is a key ingredient in QCD factorization of Drell-Yan and other processes with relatively small transverse momentum. We present a lattice QCD study of this function at moderately large rapidity on aflavor CLS dynamic ensemble with. We extract the rapidity-independent (or intrinsic) part of the soft function through a large-momentum-transfer pseudoscalar meson form factor and its quasi-TMD wave function using leading-order factorization in large-momentum effective theory. We also investigate the rapidity-dependent part of the soft function—the Collins-Soper evolution kernel—based on the large-momentum evolution of the quasi-TMD wave function.