Chiral Multiplets of Heavy-Light Mesons

Details Chiral Multiplets of Heavy-Light Mesons Chiral Multiplets of Heavy-Light Mesons

2003-05-05

arxiv.org/abs/hep-ph/0305049v2

Phys.Rev.D68:054024,2003

Physics

High Energy Physics

High Energy Physics - Phenomenology

10 pages; minor editorial revisions; recomputed M1 transition

Scientific paper

10.1103/PhysRevD.68.054024

The recent discovery of a narrow resonance in D_s+pi^0 by the BABAR collaboration is consistent with the interpretation of a heavy J^P(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, g_pi = Delta(M)/f_pi, 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 D_s+pi, D_s+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 B_s and strange doubly-heavy baryon states.

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