Isospin-violating strong decays of scalar single-heavy tetraquarks

Thomas Gutsche, Mikhail A. Ivanov, Jürgen G. Körner, Valery E. Lyubovitskij

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Abstract

We present a study of the isospin-violating one-pion strong decays of single heavy tetraquarks XQ=X(sqqQ), Q=c, b, and q=u, d with spin-parity JP=0+. We assume that the tetraquarks have the configuration of a color diquark and an antidiquark. Three mechanisms of isospin violation can contribute to the decay rate: (1) mixing of the X(suūQ) and X(sddQ) tetraquark currents, (2) an explicit md-mu quark mass difference in the quark diagrams describing the corresponding decay transitions, and (3) π0-η mixing in the final state. Our main results are as follows: (1) It is quite likely that the investigated tetraquark states are isosinglet states with a small admixture of an isotriplet component; (2) The first isospin-breaking mechanism affects the decay rather more significantly than the others; (3) Our calculations contain a size parameter ΛXQ, characterizing the distribution of the quarks in the tetraquark state XQ. Absolute decay rates depend very much on the choice of ΛXQ, varied from 1 to 2 GeV, reflecting the compactness of the multiquark system.

Original languageEnglish
Article number094012
JournalPhysical Review D
Volume94
Issue number9
DOIs
Publication statusPublished - 2016

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ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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