Susceptibility of the QCD vacuum to CP-odd electromagnetic background fields
High Energy Physics - Lattice
2013-04-16 v2 High Energy Physics - Phenomenology
High Energy Physics - Theory
Abstract
We investigate two flavor QCD in presence of CP-odd electromagnetic background fields and determine, by means of lattice QCD simulations, the induced effective theta term to the first order in the scalar product of E and B. We employ a rooted staggered discretization and study lattice spacings down to 0.1 fm and Goldstone pion masses around 480 MeV. In order to deal with a positive measure, we consider purely imaginary electric fields and real magnetic fields, then exploiting analytic continuation. Our results are relevant to a description of the effective pseudoscalar QED-QCD interactions.
Keywords
Cite
@article{arxiv.1209.0722,
title = {Susceptibility of the QCD vacuum to CP-odd electromagnetic background fields},
author = {Massimo D'Elia and Marco Mariti and Francesco Negro},
journal= {arXiv preprint arXiv:1209.0722},
year = {2013}
}
Comments
5 pages, 4 figures, 1 table. New data and references added. Matches the published version