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.

R. Aaij, B. Adeva, M. Adinolfi, A. Affolder, Z. Ajaltouni, S. Akar, 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;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
R. Aaij, B. Adeva, M. Adinolfi, A. Affolder, Z. Ajaltouni, S. Akar, 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].
R. Aaij; B. Adeva; M. Adinolfi; A. Affolder; Z. Ajaltouni; S. Akar; J. Albrecht; F. Alessio; M. Alexander; S. Ali; G. Alkhazov; P. Alvarez Cartelle; A...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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