Resolving the Bethe–Salpeter Kernel

Qin, Si-Xue; Roberts, Craig D.

doi:10.1088/0256-307X/38/7/071201

Resolving the Bethe–Salpeter Kernel

Sep 28, 2020

9 pages

Published in:

Chin.Phys.Lett. 38 (2021) 7, 071201

Published: Jul 1, 2021
and
Published: Jun 7, 2021

e-Print:

2009.13637 [hep-ph]

DOI:

10.1088/0256-307X/38/7/071201

Report number:

NJU-INP 026/20

View in:

ADS Abstract Service

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Abstract: (arXiv)

A novel method for constructing a Bethe-Salpeter kernel for the meson bound-state problem is described. It produces a closed-form kernel that is symmetry-consistent (discrete and continuous) with the gap equation defined by any admissible gluon-quark vertex. Applicable even when the diagrammatic content of that vertex is unknown, the scheme can foster new synergies between continuum and lattice approaches to strong interactions. The framework is illustrated by demonstrating that the presence of a dressed-quark anomalous magnetic moment in the gluon-quark vertex, an emergent feature of strong interactions, can remedy many defects of widely used meson bound-state kernels, including the level ordering of pseudoscalar and vector meson radial excitations.

Note:

9 pages, 3 figures. Accepted for publication as an "Express Letter" in Chinese Physics Letters

Bethe-Salpeter equation
meson: bound state
strong interaction
quark: magnetic moment
excited state
vector meson
gap equation
pseudoscalar meson
lattice field theory
quark gluon

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