The first observation of exotic states with a new quark content c anti-c u anti-s decaying to the J/ψ K+ final state is reported with high significance from an amplitude analysis of the B+ → J/ψ ϕ 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, Zcs(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/ψ ϕ final state is also observed with high significance. In addition, the four previously reported J/ψ ϕ states are confirmed and two more exotic states, Zcs(4220)+ and X(4630), are observed with significance exceeding 5 standard deviations.

Aaij, R., Abellán Beteta, C., Ackernley, T., Adeva, B., Adinolfi, M., Afsharnia, H., et al. (2021). Observation of New Resonances Decaying to J/ψ K+ and J/ψ ϕ. PHYSICAL REVIEW LETTERS, 127(8), 1-11 [10.1103/PhysRevLett.127.082001].

Observation of New Resonances Decaying to J/ψ K+ and J/ψ ϕ

Capriotti, L.;Carbone, A.;Ferrari, F.;Galli, D.;Maccolini, S.;Manuzzi, D.;Patrignani, C.;Pisani, F.;Zucchelli, S.;
2021

Abstract

The first observation of exotic states with a new quark content c anti-c u anti-s decaying to the J/ψ K+ final state is reported with high significance from an amplitude analysis of the B+ → J/ψ ϕ 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, Zcs(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/ψ ϕ final state is also observed with high significance. In addition, the four previously reported J/ψ ϕ states are confirmed and two more exotic states, Zcs(4220)+ and X(4630), are observed with significance exceeding 5 standard deviations.
2021
Aaij, R., Abellán Beteta, C., Ackernley, T., Adeva, B., Adinolfi, M., Afsharnia, H., et al. (2021). Observation of New Resonances Decaying to J/ψ K+ and J/ψ ϕ. PHYSICAL REVIEW LETTERS, 127(8), 1-11 [10.1103/PhysRevLett.127.082001].
Aaij, R.; Abellán Beteta, C.; Ackernley, T.; Adeva, B.; Adinolfi, M.; Afsharnia, H.; Aidala, C.A.; Aiola, S.; Ajaltouni, Z.; Akar, S.; Albrecht, J.; A...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/849073
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