2003/05/09 by William A. Bardeen, Estia J. Eichten, Christopher T. Hill · 1 citation
Physics and Astronomy · #hep-ph
paper · pdf · doi:10.1103/physrevd.68.054024
published as Phys.Rev.D68:054024,2003 · 10 pages; minor editorial revisions; recomputed M1 transition
arxiv created 2003/05/09 · arxiv updated 2009/11/30
The recent discovery of a narrow resonance in Ds+pi0 by the BABAR collaboration is consistent with the interpretation of a heavy JP(0+,1+) spin multiplet. This system is the parity partner of the groundstate (0-,1-) multiplet, which we argue is required in the implementation of SU(3)L x SU(3)R chiral symmetry in heavy-light meson systems. The (0+,1+)->(0-,1-)+pi transition couplings satisfy a Goldberger-Treiman relation, gpi = Delta(M)/fpi, where Delta(M) is the mass gap. The BABAR resonance fits the 0+ state, with a kinematically blocked principal decay mode to D+K. The allowed Ds+pi, Ds+2pi and electromagnetic transitions are computed from the full chiral theory and found to be suppressed, consistent with the narrowness of the state. This state establishes the chiral mass difference for all such heavy-quark chiral multiplets, and precise predictions exist for the analogous Bs and strange doubly-heavy baryon states.