A narrow pentaquark state, Pc(4312)+, decaying to J/ψ p, is discovered with a statistical significance of 7.3 σ in a data sample of Λ0b → J/ψ p K− decays, which is an order of magnitude larger than that previously analyzed by the LHCb Collaboration. The Pc(4450)+ pentaquark structure formerly reported by LHCb is confirmed and observed to consist of two narrow overlapping peaks, Pc(4440)+ and Pc(4457)+, where the statistical significance of this two-peak interpretation is 5.4 σ. The proximity of the Σc+ anti-D0 and Σc+ anti-D0* thresholds to the observed narrow peaks suggests that they play an important role in the dynamics of these states.

Aaij, R., Abellán Beteta, C., Adeva, B., Adinolfi, M., Aidala, C.A., Ajaltouni, Z., et al. (2019). Observation of a Narrow Pentaquark State, Pc(4312)+, and of the Two-Peak Structure of the Pc(4450)+. PHYSICAL REVIEW LETTERS, 122(22), 1-11 [10.1103/PhysRevLett.122.222001].

Observation of a Narrow Pentaquark State, Pc(4312)+, and of the Two-Peak Structure of the Pc(4450)+

Betti, F.;Capriotti, L.;Carbone, A.;Ferrari, F.;Galli, D.;Patrignani, C.;Perazzini, S.;Pisani, F.;Vagnoni, V.;Zucchelli, S.
2019

Abstract

A narrow pentaquark state, Pc(4312)+, decaying to J/ψ p, is discovered with a statistical significance of 7.3 σ in a data sample of Λ0b → J/ψ p K− decays, which is an order of magnitude larger than that previously analyzed by the LHCb Collaboration. The Pc(4450)+ pentaquark structure formerly reported by LHCb is confirmed and observed to consist of two narrow overlapping peaks, Pc(4440)+ and Pc(4457)+, where the statistical significance of this two-peak interpretation is 5.4 σ. The proximity of the Σc+ anti-D0 and Σc+ anti-D0* thresholds to the observed narrow peaks suggests that they play an important role in the dynamics of these states.
2019
Aaij, R., Abellán Beteta, C., Adeva, B., Adinolfi, M., Aidala, C.A., Ajaltouni, Z., et al. (2019). Observation of a Narrow Pentaquark State, Pc(4312)+, and of the Two-Peak Structure of the Pc(4450)+. PHYSICAL REVIEW LETTERS, 122(22), 1-11 [10.1103/PhysRevLett.122.222001].
Aaij, R.; Abellán Beteta, C.; 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/11585/688875
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