The decay Λ0b → ηc(1S) p K− is observed for the first time using a data sample of proton-proton collisions, corresponding to an integrated luminosity of 5.5 fb^−1, collected with the LHCb experiment at a center-of-mass energy of 13 TeV. The branching fraction of the decay is measured, using the Λ0b → J/ψ p K− decay as a normalization mode, to be B(Λ0b → ηc(1S) p K−) = (1.06 ± 0.16 ± 0.06{−0.19}{+0.22}) × 10^−4, where the quoted uncertainties are statistical, systematic and due to external inputs, respectively. A study of the ηc(1S) p mass spectrum is performed to search for the Pc(4312)+ pentaquark state. No evidence is observed and an upper limit of B(Λ0b → Pc(4312)+ K−) × B(Pc(4312)+ → ηc(1S) p)/B(Λ0b → ηc(1S) p K−) < 0.24 is obtained at the 95% confidence level.

Aaij, R., Abellán Beteta, C., Ackernley, T., Adeva, B., Adinolfi, M., Afsharnia, H., et al. (2020). First Observation of the Decay Λ0b → ηc(1S) p K−. PHYSICAL REVIEW D, 102(11), 1-12 [10.1103/PhysRevD.102.112012].

First Observation of the Decay Λ0b → ηc(1S) p K−

Betti, F.;Capriotti, L.;Carbone, A.;Ferrari, F.;Galli, D.;Maccolini, S.;Manuzzi, D.;Patrignani, C.;Pisani, F.;Zucchelli, S.;
2020

Abstract

The decay Λ0b → ηc(1S) p K− is observed for the first time using a data sample of proton-proton collisions, corresponding to an integrated luminosity of 5.5 fb^−1, collected with the LHCb experiment at a center-of-mass energy of 13 TeV. The branching fraction of the decay is measured, using the Λ0b → J/ψ p K− decay as a normalization mode, to be B(Λ0b → ηc(1S) p K−) = (1.06 ± 0.16 ± 0.06{−0.19}{+0.22}) × 10^−4, where the quoted uncertainties are statistical, systematic and due to external inputs, respectively. A study of the ηc(1S) p mass spectrum is performed to search for the Pc(4312)+ pentaquark state. No evidence is observed and an upper limit of B(Λ0b → Pc(4312)+ K−) × B(Pc(4312)+ → ηc(1S) p)/B(Λ0b → ηc(1S) p K−) < 0.24 is obtained at the 95% confidence level.
2020
Aaij, R., Abellán Beteta, C., Ackernley, T., Adeva, B., Adinolfi, M., Afsharnia, H., et al. (2020). First Observation of the Decay Λ0b → ηc(1S) p K−. PHYSICAL REVIEW D, 102(11), 1-12 [10.1103/PhysRevD.102.112012].
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/11585/797973
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