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Spectroscopy, lifetime and decay modes of the T-bb(-) tetraquark

AuthorsHernández, E.; Vijande, Javier ; Valcarce, A.; Richard, J.M.
Issue DateJan-2020
PublisherElsevier BV
CitationPHYSICS LETTERS B 800: 135073 (2020)
AbstractWe present the first full-fledged study of the flavor-exotic isoscalar T ≡bbu¯d¯ tetraquark with spin and parity J=1. We report accurate solutions of the four-body problem in a quark model, characterizing the structure of the state as a function of the ratio M/m of the heavy to light quark masses. For such a standard constituent model, T lies approximately 150 MeV below the strong decay threshold BB¯ and 105 MeV below the electromagnetic decay threshold BB¯γ. We evaluate the lifetime of T , identifying the promising decay modes where the tetraquark might be looked for in future experiments. Its total decay width is Γ≈87×10 GeV and therefore its lifetime τ≈ 7.6 ps. The promising final states are B D ℓν¯ and B¯D ℓν¯ among the semileptonic decays, and B D D , B¯D D , and B D ρ among the nonleptonic ones. The semileptonic decay to the isoscalar J=0 tetraquark T is also relevant but it is not found to be dominant. There is a broad consensus about the existence of this tetraquark, and its detection will validate our understanding of the low-energy realizations of Quantum Chromodynamics (QCD) in the multiquark sector.
Publisher version (URL)http://dx.doi.org/10.1016/j.physletb.2019.135073
Identifiersdoi: 10.1016/j.physletb.2019.135073
issn: 0370-2693
Appears in Collections:(IFIC) Artículos
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