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

Autor: Matteo Bresciani, Mattia Dalla Brida, Leonardo Giusti, Michele Pepe, Federico Rapuano
Jazyk: angličtina
Rok vydání: 2022
Předmět:
Zdroj: Physics Letters B, Vol 835, Iss , Pp 137579- (2022)
Druh dokumentu: article
ISSN: 0370-2693
DOI: 10.1016/j.physletb.2022.137579
Popis: We compute non-perturbatively the renormalization constant of the flavour-singlet local vector current ZV 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 ZV 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 ZV with an accuracy of about 8‰ for values of the inverse bare coupling constant β=6/g02 in the range 5.3≤β≤11.5.
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