The first observation of the Cabibbo-suppressed decay Λ0b → J/ψ p π− is reported using a data sample of proton-proton collisions at 7 and 8 TeV, corresponding to an integrated luminosity of 3 fb^−1. A prominent signal is observed and the branching fraction relative to the decay mode Λ0b → J/ψ p K− is determined to be B(Λ0b → J/ψ p π−)/B(Λ0b → J/ψ p K−) = 0.0824 ± 0.0025 (stat) ± 0.0042 (syst). A search for direct CP violation is performed. The difference in the CP asymmetries between these two decays is found to be A_CP(Λ0b → J/ψ p π−) − A_CP(Λ0b → J/ψ p K−) = (+5.7 ± 2.4 (stat) ± 1.2 (syst))%, which is compatible with CP symmetry at the 2.2σ level.

Aaij, R., Adeva, B., Adinolfi, M., Affolder, A., Ajaltouni, Z., Akar, S., et al. (2014). Observation of the Λ0b → J/ψ p π− Decay. JOURNAL OF HIGH ENERGY PHYSICS, 2014(7), 0-18 [10.1007/JHEP07(2014)103].

Observation of the Λ0b → J/ψ p π− Decay

CARBONE, ANGELO;A. Di Canto;GALLI, DOMENICO;MOGGI, NICCOLO';MUSSINI, MANUEL;PATRIGNANI, CLAUDIA;PERAZZINI, STEFANO;VAGNONI, VINCENZO MARIA;ZANGOLI, MARIA;
2014

Abstract

The first observation of the Cabibbo-suppressed decay Λ0b → J/ψ p π− is reported using a data sample of proton-proton collisions at 7 and 8 TeV, corresponding to an integrated luminosity of 3 fb^−1. A prominent signal is observed and the branching fraction relative to the decay mode Λ0b → J/ψ p K− is determined to be B(Λ0b → J/ψ p π−)/B(Λ0b → J/ψ p K−) = 0.0824 ± 0.0025 (stat) ± 0.0042 (syst). A search for direct CP violation is performed. The difference in the CP asymmetries between these two decays is found to be A_CP(Λ0b → J/ψ p π−) − A_CP(Λ0b → J/ψ p K−) = (+5.7 ± 2.4 (stat) ± 1.2 (syst))%, which is compatible with CP symmetry at the 2.2σ level.
2014
Aaij, R., Adeva, B., Adinolfi, M., Affolder, A., Ajaltouni, Z., Akar, S., et al. (2014). Observation of the Λ0b → J/ψ p π− Decay. JOURNAL OF HIGH ENERGY PHYSICS, 2014(7), 0-18 [10.1007/JHEP07(2014)103].
Aaij, R.; Adeva, B.; Adinolfi, M.; Affolder, A.; Ajaltouni, Z.; Akar, S.; Albrecht, J.; Alessio, F.; Alexander, M.; Ali, S.; Alkhazov, G.; Alvarez Car...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/320116
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