Recent Results in Chiral Perturbation Theory for Mesons Containing a Single Heavy Quark

Abstract

Chiral symmetry and heavy quark symmetry constrain the interactions of mesons containing a single heavy quark with low-momentum pions. Chiral corrections to the Isgur-Wise function for ${\bar{B}}_s\to D_s^{(\ast )}$ versus $\bar{B}\to D^{(\ast )}$ semileptonic decay, the ratio of heavy meson decay constants $f_{D_s}/f_D$ or $f_{B_s}/f_B$, the amplitudes for $B_s-{\bar{B}}_s$ versus $B^0-\bar{B}{}^0$ mixing, and the heavy meson mass splittings are calculated in chiral perturbation theory. (Invited talk Rencontres de Moriond 1993)

Comments: UCSD/PTH 93-10, 6 pages, 2 figures