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Paper detail

TMD Soft Function from Large-Momentum Effective Theory

We study Euclidean formulations of the transverse-momentum-dependent (TMD) soft function, which is a cross section for soft gluon radiations involving color charges moving in two conjugate lightcone directions in quantum chromodynamics. We show it is related to a special form factor of a pair of color sources traveling with nearly-lightlike velocities, which can be matched to TMD physical observables in semi-inclusive deep-inelastic scattering and Drell-Yan process in the framework of large momentum effective theory. It can also be extracted by combining a large-momentum form factor of light meson and its leading TMD wave function. These formulations are useful for initiating nonperturbative calculations of this useful quantity.

preprint2020arXivOpen access
Xiangdong JiYizhuang LiuYu-Sheng Liu
hep-exhep-phnucl-exhep-latnucl-th
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Xiangdong JiYizhuang LiuYu-Sheng Liu

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