Using proton-proton collision data, collected with the LHCb detector and corresponding to 1.0, 2.0 and 1.9 fb^−1 of integrated luminosity at the centre-of-mass energies of 7, 8, and 13 TeV, respectively, the decay Λ0b → χc1(3872) p K− with χc1(3872) → J/ψ π+ π− is observed for the first time. The significance of the observed signal is in excess of seven standard deviations. It is found that (58 ± 15)% of the decays proceed via the two-body intermediate state χc1(3872) Λ(1520). The branching fraction with respect to that of the Λ0b → ψ(2S) p K− decay mode, where the ψ(2S) meson is reconstructed in the J/ψ π+ π− final state, is measured to be: B(Λ0b → χc1(3872) p K−) / B(Λ0b → ψ(2S) p K−) × B(χc1(3872) → J/ψ π+ π−) / B(ψ(2S) → J/ψ π+ π−) = (5.4 ± 1.1 ± 0.2) × 10^−2, where the first uncertainty is statistical and the second is systematic.

Aaij, R., Abellán Beteta, C., Ackernley, T., Adeva, B., Adinolfi, M., Aidala, C., et al. (2019). Observation of the Λ0b → χc1(3872) p K− Decay. JOURNAL OF HIGH ENERGY PHYSICS, 2019(9), 0-19 [10.1007/JHEP09(2019)028].

Observation of the Λ0b → χc1(3872) p K− Decay

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

Abstract

Using proton-proton collision data, collected with the LHCb detector and corresponding to 1.0, 2.0 and 1.9 fb^−1 of integrated luminosity at the centre-of-mass energies of 7, 8, and 13 TeV, respectively, the decay Λ0b → χc1(3872) p K− with χc1(3872) → J/ψ π+ π− is observed for the first time. The significance of the observed signal is in excess of seven standard deviations. It is found that (58 ± 15)% of the decays proceed via the two-body intermediate state χc1(3872) Λ(1520). The branching fraction with respect to that of the Λ0b → ψ(2S) p K− decay mode, where the ψ(2S) meson is reconstructed in the J/ψ π+ π− final state, is measured to be: B(Λ0b → χc1(3872) p K−) / B(Λ0b → ψ(2S) p K−) × B(χc1(3872) → J/ψ π+ π−) / B(ψ(2S) → J/ψ π+ π−) = (5.4 ± 1.1 ± 0.2) × 10^−2, where the first uncertainty is statistical and the second is systematic.
2019
Aaij, R., Abellán Beteta, C., Ackernley, T., Adeva, B., Adinolfi, M., Aidala, C., et al. (2019). Observation of the Λ0b → χc1(3872) p K− Decay. JOURNAL OF HIGH ENERGY PHYSICS, 2019(9), 0-19 [10.1007/JHEP09(2019)028].
Aaij, R.; Abellán Beteta, C.; Ackernley, T.; Adeva, B.; Adinolfi, M.; Aidala, C.A.; Aiola, S.; Ajaltouni, Z.; Akar, S.; Albicocco, P.; Albrecht, J.; A...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/701205
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