Quark anomalous magnetic moment in an extreme magnetic background from perturbative QCD

Author:

Fraga Eduardo S.1ORCID,Palhares Leticia F.2ORCID,Villavicencio Cristian3ORCID

Affiliation:

1. Universidade Federal do Rio de Janeiro

2. Universidade do Estado do Rio de Janeiro

3. Universidad del Bío-Bío

Abstract

We compute the one-loop QCD correction to the photon-quark-antiquark vertex in an extremely strong magnetic background, i.e., one in which eB is much larger than all other mass scales. We resort to the lowest-Landau level approximation, and consider on-shell fermions. We find that the total magnetic moment is such that the anomalous magnetic moment contributes to the electric part iE3σ3, the other contributions to B·σ and iE·σ being completely suppressed. We show results for the anomalous magnetic moment of quarks up and down, scaled by their values in the vacuum, as a function of the external magnetic field, considering dressed gluons and a renormalization scale μMS¯=|eB|. Published by the American Physical Society 2024

Funder

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior

Conselho Nacional de Desenvolvimento Científico e Tecnológico

Fundação Carlos Chagas Filho de Amparo à Pesquisa do Estado do Rio de Janeiro

Instituto Nacional de Ciência e Tecnologia: Física Nuclear e Aplicações

Agencia Nacional de Investigación y Desarrollo

Fondo Nacional de Desarrollo Científico y Tecnológico

Publisher

American Physical Society (APS)

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