Susceptibility of the QCD vacuum to CP-odd electromagnetic background fields.
Phys Rev Lett
; 110(8): 082002, 2013 Feb 22.
Article
em En
| MEDLINE
| ID: mdl-23473133
ABSTRACT
We investigate two flavor quantum chromodynamics (QCD) in the presence of CP-odd electromagnetic background fields and determine, by means of lattice QCD simulations, the induced effective θ term to first order in E[over â] · B[over â]. 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, and then exploit the analytic continuation. Our results are relevant to a description of the effective pseudoscalar quantum electrodynamics-QCD interactions.
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MEDLINE
Idioma:
En
Revista:
Phys Rev Lett
Ano de publicação:
2013
Tipo de documento:
Article
País de afiliação:
Itália