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.File | Dimensione | Formato | |
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Aaij2018_Article_EvidenceForAnEtaC1SPi-Ηc1SΠ-Re.pdf
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