A Dalitz plot analysis of 0→(1)+− decays is performed using data samples of pp collisions collected with the LHCb detector at centre-of-mass energies of √=7, 8 and 13TeV, corresponding to a total integrated luminosity of 4.7 fb −1. A satisfactory description of the data is obtained when including a contribution representing an exotic (1)− resonant state. The significance of this exotic resonance is more than three standard deviations, while its mass and width are 4096±20 +18−22MeV and 152±58 +60−35MeV, respectively. The spin-parity assignments =0+ and =1− are both consistent with the data. In addition, the first measurement of the 0→(1)+− branching fraction is performed and gives B(B0→ηc(1S)K+π−)=(5.73±0.24±0.13±0.66)×10−4, where the first uncertainty is statistical, the second systematic, and the third is due to limited knowledge of external branching fractions.

Evidence for an ηc(1S)π− resonance in B0→ηc(1S)K+π− decays

Calabrese, R.;Capriotti, L.;Fiorini, M.;Luppi, E.;Minzoni, L.;Pappalardo, L. L.;Skiba, I.;Tomassetti, L.;
2018

Abstract

A Dalitz plot analysis of 0→(1)+− decays is performed using data samples of pp collisions collected with the LHCb detector at centre-of-mass energies of √=7, 8 and 13TeV, corresponding to a total integrated luminosity of 4.7 fb −1. A satisfactory description of the data is obtained when including a contribution representing an exotic (1)− resonant state. The significance of this exotic resonance is more than three standard deviations, while its mass and width are 4096±20 +18−22MeV and 152±58 +60−35MeV, respectively. The spin-parity assignments =0+ and =1− are both consistent with the data. In addition, the first measurement of the 0→(1)+− branching fraction is performed and gives B(B0→ηc(1S)K+π−)=(5.73±0.24±0.13±0.66)×10−4, where the first uncertainty is statistical, the second systematic, and the third is due to limited knowledge of external branching fractions.
2018
Aaij, R.; Beteta, C. Abellán; Adeva, B.; Adinolfi, M.; Aidala, C. A.; Ajaltouni, Z.; Akar, S.; Albicocco, P.; Albrecht, J.; Alessio, F.; Alexander, M....espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11392/2397130
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