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Susceptibility of the QCD vacuum to CP-odd electromagnetic background fields

D'Elia, Massimo and Mariti, Marco and Negro, Francesco (2012) Susceptibility of the QCD vacuum to CP-odd electromagnetic background fields. arXiv .

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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.

Item Type: Article
Additional Information: Imported from arXiv
Subjects: Area02 - Scienze fisiche > FIS/02 - Fisica teorica, modelli e metodi matematici
Divisions: Dipartimenti (from 2013) > DIPARTIMENTO DI FISICA
Depositing User: dott.ssa Sandra Faita
Date Deposited: 29 Oct 2013 00:41
Last Modified: 29 Oct 2013 00:41
URI: http://eprints.adm.unipi.it/id/eprint/1558

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