The Cabibbo-suppressed decay Λb0 → ψ(2S)pπ− is observed for the first time using a data sample collected by the LHCb experiment in proton-proton collisions corresponding to 1.0, 2.0 and 1.9 fb−1 of integrated luminosity at centre-of-mass energies of 7, 8 and 13 TeV, respectively. The ψ(2S) mesons are reconstructed in the μ+μ− final state. The branching fraction with respect to that of the Λb0 → ψ(2S)pK− decay mode is measured to be ℬ(Λb0→ψ(2S)pπ−)/ℬ(Λb0→ψ(2S)pK−) = (11.4 ± 1.3 ± 0.2)%, where the first uncertainty is statistical and the second is systematic. The ψ(2S)p and ψ(2S)π− mass spectra are investigated and no evidence for exotic resonances is found.

Aaij, R., Adeva, B., Adinolfi, M., Aidala, C., Ajaltouni, Z., Akar, S., et al. (2018). Observation of the decay Λ b0 → ψ(2S)pπ−. JOURNAL OF HIGH ENERGY PHYSICS, 2018(8) [10.1007/JHEP08(2018)131].

Observation of the decay Λ b0 → ψ(2S)pπ−

Belloli, N.;Borsato, M.;Calvi, M.;Carniti, P.;Cassina, L.;Fazzini, D.;Gotti, C.;Martinelli, M.;Matteuzzi, C.;Petruzzo, M.;
2018

Abstract

The Cabibbo-suppressed decay Λb0 → ψ(2S)pπ− is observed for the first time using a data sample collected by the LHCb experiment in proton-proton collisions corresponding to 1.0, 2.0 and 1.9 fb−1 of integrated luminosity at centre-of-mass energies of 7, 8 and 13 TeV, respectively. The ψ(2S) mesons are reconstructed in the μ+μ− final state. The branching fraction with respect to that of the Λb0 → ψ(2S)pK− decay mode is measured to be ℬ(Λb0→ψ(2S)pπ−)/ℬ(Λb0→ψ(2S)pK−) = (11.4 ± 1.3 ± 0.2)%, where the first uncertainty is statistical and the second is systematic. The ψ(2S)p and ψ(2S)π− mass spectra are investigated and no evidence for exotic resonances is found.
Articolo in rivista - Articolo scientifico
B physics; Flavor physics; Hadron-Hadron scattering (experiments); Spectroscopy; Nuclear and High Energy Physics
English
2018
2018
8
131
open
Aaij, R., Adeva, B., Adinolfi, M., Aidala, C., Ajaltouni, Z., Akar, S., et al. (2018). Observation of the decay Λ b0 → ψ(2S)pπ−. JOURNAL OF HIGH ENERGY PHYSICS, 2018(8) [10.1007/JHEP08(2018)131].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/215461
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