Isospin Breaking in Baryon Chiral Perturbation Theory

Details Isospin Breaking in Baryon Chiral Perturbation Theory Isospin Breaking in Baryon Chiral Perturbation Theory

May 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aps..apr.d7005g&link_type=abstract

American Physical Society, April Meeting, 2004, May 1-4, 2004, Denver, Colorado April 2004, MEETING ID: APR04, abstract #D7.005

Physics

Scientific paper

We present a study of isospin breaking in QCD within the consistent framework of Chiral Perturbation Theory including the effects induced by considering the presence of virtual photons on the effective theory. First, the results for the pion decay constants are reviewed. Second, we present the electromagnetic and strong isospin breaking contributions to the baryon masses and the σ-terms to fourth order in Lorentz covariant baryon chiral perturbation theory where both Lorentz invariance and chiral power counting are preserved using the infrared regularization prescription for evaluating loop integrals. Finally, we compare our results to those obtained earlier within the heavy baryon formalism of the effective field theory.

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