1992/06/22 by Adam F. Falk, Michael Luke · 6 citations
Physics and Astronomy · #Baryon #Chiral perturbation theory #Excited state #Formalism (music) #High-Energy Particle Collisions Research #Meson #Particle physics theoretical and experimental studies #Pion #Quantum Chromodynamics and Particle Interactions #Quark #Quark model #Recoil #hep-ph
paper · pdf · doi:10.1016/0370-2693(92)90618-e
published as Phys.Lett.B292:119-127,1992 · (14 pages, 2 figures available from the authors, harvmac.tex required), SLAC-PUB-5812, UCSD/PTH 92-14
arxiv created 1992/06/22 · openalex publication_date 1992/10/01 · arxiv updated 2010/11/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We construct an effective Lagrangian describing the interaction of soft pions and kaons with mesons containing a heavy quark and light degrees of freedom in an orbital p wave. The formalism is easily extended to heavy mesons and baryons in arbitrary excited states. We calculate the leading contributions to the strong decays \dtwo→\dπ, \dtwo→\dstarπ and \done→\dstarπ. We confirm the relations between the rates previously obtained by Isgur and Wise using heavy quark symmetry, and find that the absolute widths are consistent with na"ıve power counting. We also estimate the branching ratios for the two pion decays \dtwo→\dstarππ, \done→\dstarππ and \done→\dππ, which are dominated by pole graphs. Our predictions depend on the masses and widths of the as yet unseen scalar-pseudovector p-wave doublet. Heavy quark spin symmetry predicts Γ(\dtwo→\dstarππ): Γ(\done→\dstarππ):Γ(\done→\dππ)=3:1:2, but this relation is badly violated in practice because 1/M effects arising purely from kinematics are large.