Chiral Symmetry-breaking Corrections To Strong Decays Of P Wave Excited Heavy-light Mesons In HHχPT

This paper mainly studied the strong decays of p-wave orbitally excited heavy-light mesons. The heavy hadron chiral perturbation theory (HHxPT) is an effective field theory, which units the spontaneous breaking chiral symmetry SU(3)L×SU(3)R under the light-quark-limit and the heavy quark spin-flavor symmetry U(2Nh) under the heavy-quark-limit. Firstly, we constructed the chiral symmetry-breaking Lagrangian:by the symmetry-analyzing, we got the general Lagrangian up to terms of the next-to-leading or-der in 1/∧x; by making use of the widths of the S-doublet’s heavy-light mesons D0*0 (2400), D*0±(2400) and D1’0(2430) which are understood well by experiments, minimizing χ2, we fixed it. Secondly, assuming the exotic narrow mesons-D*S0(2317) and D’sl(2460) being the (0+,1+) chiral partners of Ds and D*s in the heavy-quark-symmetry, we calculated the widths of the isospin symmetry-breaking decay modes-D*s0(2317)â†'Dsηâ†'DsÏ€0 and D’sl(2A60)â†'D*sηâ†'Ds*Ï€0 under HHχPT. What’s more, with their single-pion decay widths, making use of the ratio data by experiments and PDG, the radiative decay widths and the total widths were calculated, and the results are Ttotal(Ds*0(2317))≈42.4Kev, Γtotai(D’sl(2460))≈68.4Kev. The numerical results obtained are in consistent with ex-perimental constraints and comparable with other theoretical works. And by comparison, we found that the chiral symmetry-breaking effects are obvious. Finally, for the unob-served S doublet beauty mesons-B0*0, B*0-,B*s0, B1’0, B’1- and B’sl0 quoting the predicted masses by Colangelo et al in the same framework, we predicted their single-pion decay widths, which are comparable with other theoretical works. These predictions should be tested in the near experiments of LHCb and B-meson factories.