Nonperturbative determination of the Collins-Soper kernel from quasitransverse-momentum-dependent wave functions

Nonperturbative determination of the Collins-Soper kernel from quasitransverse-momentum-dependent wave functions
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从准横动量相关波函数非微扰确定 Collins-Soper 核

DOI:
10.1103/physrevd.106.034509
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发表时间:
2022-04
期刊:
影响因子:
5
通讯作者:
Zhang Qi-An
Zhang Qi-An
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Chu Min-Huan;Deng Zhi-Fu;Hua Jun;Ji Xiangdong;Schäfer Andreas;Su Yushan;Sun Peng;Wang Wei;Yang Yi-Bo;Zeng Jun;Zhang Jialu;Zhang Jian-Hui;Zhang Qi-An

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在单圈匹配精度的大动量有效理论框架下,我们对支配横动量相关(TMD)分布的快度演化的Collins-Soper核进行了格点计算。我们首先得到了三种不同介子动量下的准TMD波函数,在一个动力学高度改进的交错夸克海上,在一个含有价三叶草夸克的晶格上,晶格间距a=0.12text{ }text{ }mathrm{fm}$来自MILC合作组,并使用Wilson环重整化了相关的线性发散。通过对光锥波函数的单圈匹配,我们确定了横向分离高达0.6 fm的Collins-Soper核。我们研究了算子混合和尺度依赖的系统不确定性,以及更高的功率校正的影响。我们的结果可能允许以单圈精度确定软函数和其他横向动量相关量。
In the framework of large-momentum effective theory at one-loop matching accuracy, we perform a lattice calculation of the Collins-Soper kernel, which governs the rapidity evolution of transverse-momentum-dependent (TMD) distributions. We first obtain the quasi-TMD wave functions at three different meson momenta, on a lattice with valence clover quarks on a dynamical highly improved staggered quark sea and lattice spacing $a=0.12text{ }text{ }mathrm{fm}$ from the MILC Collaboration, and renormalize the pertinent linear divergences using Wilson loops. Through one-loop matching to the light-cone wave functions, we determine the Collins-Soper kernel with transverse separation up to 0.6 fm. We study the systematic uncertainties from operator mixing and scale dependence, as well as the impact from higher power corrections. Our results potentially allow for a determination of the soft function and other transverse-momentum-dependent quantities at one-loop accuracy.
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