%0 Journal Article
%T Spectroscopy, lifetime and decay modes of the T-bb(-) tetraquark
%A Hernandez, E.
%A Vijande, J.
%A Valcarce, A.
%A Richard, J. M.
%J Physics Letters B
%D 2020
%V 800
%I Elsevier
%@ 0370-2693
%G English
%F Hernandez_etal2020
%O WOS:000503832500055
%O exported from refbase (https://references.ific.uv.es/refbase/show.php?record=4240), last updated on Mon, 20 Jan 2020 07:34:15 +0000
%X We present the first full-fledged study of the flavor-exotic isoscalar T-bb(-) equivalent to bb (u) over bar(d) over bar tetraquark with spin and parity J(P) = 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-Q/m(q) of the heavy to light quark masses. For such a standard constituent model, T-bb(-) lies approximately 150 MeV below the strong decay threshold B- (B) over bar*(0) and 105 MeV below the electromagnetic decay threshold B- (B) over bar (0)gamma. We evaluate the lifetime of T-bb(-), identifying the promising decay modes where the tetraquark might be looked for in future experiments. Its total decay width is Gamma approximate to 87 x 10(-15) GeV and therefore its lifetime tau approximate to 7.6 ps. The promising final states are B*(-) D*(+) l (v) over bar (l) and (B) over bar*(0) l (v) over bar (l) among the semileptonic decays, and B*(-) D*(+) D-s*(-), (B) over bar*(0) D*(0) D-s*(-), and B*(-) D*(+) rho(-) among the nonleptonic ones. The semileptonic decay to the isoscalar J(P) = 0(+) tetraquark T-bc(0) 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.
%R 10.1016/j.physletb.2019.135073
%U https://arxiv.org/abs/1910.13394
%U https://doi.org/10.1016/j.physletb.2019.135073
%P 135073-9pp