The decay Λb0→Λc+pp‾π− is observed using pp collision data collected with the LHCb detector at centre-of-mass energies of √s=7 and 8 Tev, corresponding to an integrated luminosity of 3 fb−1. The ratio of branching fractions between Λb0→Λc+pp‾π− and Λb0→Λc+π− decays is measured to be B(Λb0→Λc+pp‾π−)/B(Λb0→Λc+π−) = 0.0540 ± 0.0023 ± 0.0032. Two resonant structures are observed in the Λc+π− mass spectrum of the Λb0→Λc+pp‾π− decays, corresponding to the Σc(2455)0 and Σc*(2520)0 states. The ratios of branching fractions with respect to the decay Λb0→Λc+pp‾π− are B(Λb0→Σc0pp‾)xB(Σc0→Λc+π−)/B(Λb0→Λc+pp‾π−) = 0.089 ± 0.015 ± 0.006, B(Λb0→Σc*0pp‾)xB(Σc*0→Λc+π−)/B(Λb0→Λc+pp‾π−) =0.119 ± 0.020 ± 0.014. In all of the above results, the first uncertainty is statistical and the second is systematic. The phase space is also examined for the presence of dibaryon resonances. No evidence for such resonances is found.

Aaij, R., Adeva, B., Adinolfi, M., Ajaltouni, Z., Akar, S., Albicocco, P., et al. (2018). Observation of the decay Λb0→Λc+pp‾π−. PHYSICS LETTERS. SECTION B, 784, 101-111 [10.1016/j.physletb.2018.07.033].

Observation of the decay Λb0→Λc+pp‾π−

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

Abstract

The decay Λb0→Λc+pp‾π− is observed using pp collision data collected with the LHCb detector at centre-of-mass energies of √s=7 and 8 Tev, corresponding to an integrated luminosity of 3 fb−1. The ratio of branching fractions between Λb0→Λc+pp‾π− and Λb0→Λc+π− decays is measured to be B(Λb0→Λc+pp‾π−)/B(Λb0→Λc+π−) = 0.0540 ± 0.0023 ± 0.0032. Two resonant structures are observed in the Λc+π− mass spectrum of the Λb0→Λc+pp‾π− decays, corresponding to the Σc(2455)0 and Σc*(2520)0 states. The ratios of branching fractions with respect to the decay Λb0→Λc+pp‾π− are B(Λb0→Σc0pp‾)xB(Σc0→Λc+π−)/B(Λb0→Λc+pp‾π−) = 0.089 ± 0.015 ± 0.006, B(Λb0→Σc*0pp‾)xB(Σc*0→Λc+π−)/B(Λb0→Λc+pp‾π−) =0.119 ± 0.020 ± 0.014. In all of the above results, the first uncertainty is statistical and the second is systematic. The phase space is also examined for the presence of dibaryon resonances. No evidence for such resonances is found.
Articolo in rivista - Articolo scientifico
Nuclear and High Energy Physics
English
2018
784
101
111
none
Aaij, R., Adeva, B., Adinolfi, M., Ajaltouni, Z., Akar, S., Albicocco, P., et al. (2018). Observation of the decay Λb0→Λc+pp‾π−. PHYSICS LETTERS. SECTION B, 784, 101-111 [10.1016/j.physletb.2018.07.033].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/215399
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