Heavy-quark symmetry and chiral dynamics

Tung Mow Yan*, Hai Yang Cheng, Chi Yee Cheung, Guey-Lin Lin, Y. C. Lin, Hoi Lai Yu

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

574 Scopus citations


The flavor and spin symmetry of the heavy quarks and the spontaneously broken approximate SU(3)L×SU(3)R chiral symmetry of the light quarks are exploited to formulate a theory describing the low-energy interactions of the heavy mesons (Qq» bound states) and heavy baryons (Qq1q2 bound states) with the Goldstone bosons, K, and. The theory contains only three parameters independent of the number of heavy-quark species involved. They can be determined by the decays D*D+, cc+, and c*c+. Theoretically, these coupling constants are related, through partial conservation of axial-vector current, to the axial charges of the heavy mesons and the heavy baryons. They are all calculable in the nonrelativistic quark model by using the spin wave functions of these particles alone. The theory is applied to strong decays and semileptonic weak decays of the heavy mesons and baryons. The implications are also discussed.

Original languageEnglish
Pages (from-to)1148-1164
Number of pages17
JournalPhysical Review D
Issue number3
StatePublished - 1 Jan 1992

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