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Observation of New Resonances Decaying to J=Psi K plus and J=Psi phi

Aaij, R. ; Eklund, Lars ; Zunica, G.

Physical review letters, 2021-08, Vol.127 (8) [Periódico revisado por pares]

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Título:
Observation of New Resonances Decaying to J=Psi K plus and J=Psi phi
Autor: Aaij, R. ; Eklund, Lars ; Zunica, G.
É parte de: Physical review letters, 2021-08, Vol.127 (8)
Descrição: The first observation of exotic states with a new quark content ccus decaying to the J/Psi K+ final state is reported with high significance from an amplitude analysis of the B+-> J/ Psi phi K+ decay. The analysis is carried out using proton-proton collision data corresponding to a total integrated luminosity of 9 fb- 1 collected by the LHCb experiment at center-of-mass energies of 7, 8, and 13 TeV. The most significant state, Z(cs)(4000)+, has a mass of 4003 +/- 6 (-14) (+4) MeV, a width of 131 +/- 15 +/- 26 MeV, and spin parity J(P) = 1(+), where the quoted uncertainties are statistical and systematic, respectively. A new 1(+) X(4685) state decaying to the J/Psi phi final state is also observed with high significance. In addition, the four previously reported J/Psi phi states are confirmed and two more exotic states, Z(cs) (4220) (+) and X(4630), are observed with significance exceeding 5 standard deviations.
Idioma: Inglês

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