TY  - JOUR
AU  - Hernandez, E.
AU  - Vijande, J.
AU  - Valcarce, A.
AU  - Richard, J. M.
PY  - 2020
DA  - 2020//
TI  - Spectroscopy, lifetime and decay modes of the T-bb(-) tetraquark
T2  - Phys. Lett. B
JO  - Physics Letters B
SP  - 135073
EP  - 9pp
VL  - 800
PB  - Elsevier
AB  - 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.
SN  - 0370-2693
UR  - https://arxiv.org/abs/1910.13394
UR  - https://doi.org/10.1016/j.physletb.2019.135073
DO  - 10.1016/j.physletb.2019.135073
LA  - English
N1  - WOS:000503832500055
ID  - Hernandez_etal2020
ER  -