INVESTIGADORES
GOMEZ DUMM Daniel Alberto
artículos
Título:
Charged meson masses under strong magnetic fields: Gauge invariance and Schwinger phases
Autor/es:
DANIEL GOMEZ DUMM; SANTIAGO NOGUERA; NORBERTO N. SCOCCOLA
Revista:
Physical Review D
Editorial:
American Physical Society
Referencias:
Año: 2023 vol. 108
Resumen:
We study the role of the Schwinger phase (SP) that appears in the propagator of a charged particle in the presence of a static and uniform magnetic field B. We first note that this phase cannot be removed by a gauge transformation; far from this, we show that it plays an important role in the restoration of the symmetries of the system. Next, we analyze the effect of SPs in the one-loop corrections to charged pion and rho meson self-energies. To carry out this analysis we consider first a simple form for the meson-quark interactions, and then we study the π+ and ρ+ propagators within the Nambu-Jona-Lasinio model, performing a numerical analysis of the B dependence of meson lowest energy states. For both π+ and ρ+ mesons, we compare the numerical results arising from the full calculationin which SPs are included in the propagators, and meson wave functions correspond to states of definite Landau quantum numberand those obtained within alternative schemes in which SPs are neglected (or somehow eliminated) and meson states are described by plane waves of definite four-momentum.