We report on measurements of the mass and lifetime of the Ξb− baryon using about 1800 Ξb− decays reconstructed in a proton-proton collision data set corresponding to an integrated luminosity of 3.0 fb^−1 collected by the LHCb experiment. The decays are reconstructed in the Ξb− → Ξc0 π−, Ξc0 → p K− K− π+ channel and the mass and lifetime are measured using the Λ0b → Λc+ π− mode as a reference. We measure M(Ξb−) − M(Λ0b) = 178.36 ± 0.46 ± 0.16 MeV/c2, (τ_Ξb−/τ_Λ0b) = 1.089 ± 0.026 ± 0.011, where the uncertainties are statistical and systematic, respectively. These results lead to a factor of 2 better precision on the Ξb− mass and lifetime compared to previous best measurements, and are consistent with theoretical expectations.

R. Aaij, B. Adeva, M. Adinolfi, A. Affolder, Z. Ajaltouni, S. Akar, et al. (2014). Precision Measurement of the Mass and Lifetime of the Ξb− Baryon. PHYSICAL REVIEW LETTERS, 113(24), 1-9 [10.1103/PhysRevLett.113.242002].

Precision Measurement of the Mass and Lifetime of the Ξb− Baryon

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

Abstract

We report on measurements of the mass and lifetime of the Ξb− baryon using about 1800 Ξb− decays reconstructed in a proton-proton collision data set corresponding to an integrated luminosity of 3.0 fb^−1 collected by the LHCb experiment. The decays are reconstructed in the Ξb− → Ξc0 π−, Ξc0 → p K− K− π+ channel and the mass and lifetime are measured using the Λ0b → Λc+ π− mode as a reference. We measure M(Ξb−) − M(Λ0b) = 178.36 ± 0.46 ± 0.16 MeV/c2, (τ_Ξb−/τ_Λ0b) = 1.089 ± 0.026 ± 0.011, where the uncertainties are statistical and systematic, respectively. These results lead to a factor of 2 better precision on the Ξb− mass and lifetime compared to previous best measurements, and are consistent with theoretical expectations.
2014
R. Aaij, B. Adeva, M. Adinolfi, A. Affolder, Z. Ajaltouni, S. Akar, et al. (2014). Precision Measurement of the Mass and Lifetime of the Ξb− Baryon. PHYSICAL REVIEW LETTERS, 113(24), 1-9 [10.1103/PhysRevLett.113.242002].
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/11585/397036
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