Broken chiral symmetry and the classification of B mesons

Abstract

We consider broken SU(5) × SU(5) chiral symmetry and we assume that the vacuum is SU(5)-symmetric. Using the observed mass spectrum of pseudoscalar mesons, and setting the [Formula: see text] mass in the range 5.2 ± 0.06 GeV, we predict the masses of [Formula: see text], [Formula: see text], and ηb states as well as axial current couplings fi/fπ. SU(5) × SU(5) is found to be consistent with SU(4) × SU(4) breaking. The problem of η − η′ − ηe − ηb mixing is also discussed.