Non-perturbative renormalization of the QCD flavour-singlet local vector current

被引:1
|
作者
Bresciani, Matteo [1 ,2 ]
Dalla Brida, Mattia [3 ]
Giusti, Leonardo [1 ,2 ]
Pepe, Michele [2 ]
Rapuano, Federico [1 ,2 ]
机构
[1] Univ Milano Bicocca, Dipartimento Fis, Piazza Sci 3, I-20126 Milan, Italy
[2] Ist Nazl Fis Nucl, Sez Milano Bicocca, Piazza Sci 3, I-20126 Milan, Italy
[3] CERN, Theoret Phys Dept, CH-1211 Geneva 23, Switzerland
关键词
LATTICE QCD; IMPROVEMENT;
D O I
10.1016/j.physletb.2022.137579
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We compute non-perturbatively the renormalization constant of the flavour-singlet local vector current Z(V) in lattice QCD with 3 massless flavours. Gluons are discretized by the Wilson plaquette action while quarks by the O(a)-improved Wilson-Dirac operator. The constant Z(V) is fixed by comparing the expectation values (1-point functions) of the conserved and local vector currents at finite temperature in the presence of shifted boundary conditions and at non-zero imaginary chemical potential. Monte Carlo simulations with a moderate computational cost allow us to obtain Z(V) with an accuracy of about 8 parts per thousand for values of the inverse bare coupling constant beta = 6/g(0)(2) in the range 5.3 <= beta <= 11.5. (C) 2022 The Author(s). Published by Elsevier B.V.
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页数:7
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