Published January 1, 2020
| Version v1
Journal article
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Lattice QCD Calculations of Transverse-Momentum-Dependent Soft Function through Large-Momentum Effective Theory
Creators
- 1. Shanghai Jiao Tong Univ, Tsung Dao Lee Inst, Shanghai Key Lab Particle Phys & Cosmol, MOE Key Lab Particle Astrophys & Cosmol, Shanghai 200240, Peoples R China
- 2. Shanghai Jiao Tong Univ, Sch Phys & Astron, MOE Key Lab Particle Astrophys & Cosmol, INPAC,Shanghai Key Lab Particle Phys & Cosmol, Shanghai 200240, Peoples R China
- 3. Univ Regensburg, Inst Theoret Phys, D-93040 Regensburg, Germany
- 4. Nanjing Normal Univ, Nanjing 210023, Jiangsu, Peoples R China
Description
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 a 2 + 1 flavor CLS dynamic ensemble with a = 0.098 fm. 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.
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