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Lattice QCD Study of Transverse-Momentum Dependent Soft Function
Li, Yuan Xia, Shi-Cheng Alexandrou, Constantia Cichy, Krzysztof Feng, Xu Hadjiyiannakou, Kyriakos Jansen, Karl Liu, Chuan
Li, Yuan
Xia, Shi-Cheng
Alexandrou, Constantia
Cichy, Krzysztof
Feng, Xu
Hadjiyiannakou, Kyriakos
Jansen, Karl
Liu, Chuan
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Journal article
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2022-02-08
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Physics
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http://dx.doi.org/10.1103/physrevlett.128.062002
Abstract
In this work, we perform a lattice QCD study of the intrinsic, rapidity-independent soft function within the framework of large momentum effective theory. The computation is carried out using a gauge ensemble of Nf=2+1+1 clover-improved twisted mass fermion. After applying an appropriate renormalization procedure and the removal of significant higher-twist contamination, we obtain the intrinsic soft function that is comparable to the one-loop perturbative result at large external momentum. The determination of the nonperturbative soft function from first principles is crucial to sharpen our understanding of the processes with small transverse momentum such as the Drell-Yan production and the semi-inclusive deep inelastic scattering. Additionally, we calculate the Collins-Soper evolution kernel using the quasi-transverse-momentum-dependent wave function as input.
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Physical Review Letters, Vol. 128, Iss. 6
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