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Si us plau utilitzeu sempre aquest identificador per citar o enllaçar aquest document: https://hdl.handle.net/2445/186516
Evidence for an ηc(1 S) π- resonance in B0→ ηc(1 S) K+π- decays
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A Dalitz plot analysis of B0 → ηc(1S)K +π− decays is performed using data samples of pp collisions collected with the LHCb detector at centre-of-mass energies of √s = 7, 8 and 13 TeV, 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 ηc(1S)π− resonant state. The significance of this exotic resonance is more than three standard deviations, while its mass and width are 4096 ± 20 +18 −22 MeV and 152±58 +60 −35 MeV, respectively. The spin-parity assignments J P = 0+ and J P = 1− are both consistent with the data. In addition, the first measurement of the B0 → ηc(1S)K +π− 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.
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ALFONSO ALBERO, Alejandro, CALVO GOMEZ, M., CAMBONI, Alessandro, COQUEREAU, Samuel, GARRIDO BELTRÁN, Lluís, GASCÓN FORA, David, GIRONELLA GIRONELL, Pere, GRACIANI DÍAZ, Ricardo, GRAUGÉS POUS, Eugeni, VAZQUEZ GOMEZ, R., LHCb collaboration. Evidence for an ηc(1 S) π- resonance in B0→ ηc(1 S) K+π- decays. _European Physical Journal C_. 2018. Vol. 78, núm. 12, pàgs. 1019. [consulta: 21 de gener de 2026]. ISSN: 1434-6044. [Disponible a: https://hdl.handle.net/2445/186516]