The ratio of the Λ0b baryon lifetime to that of the anti-B0 meson is measured using 1.0 fb^−1 of integrated luminosity in 7 TeV center-of-mass energy pp collisions at the LHC. The Λ0b baryon is observed for the first time in the decay mode Λ0b → J/ψ p K−, while the anti-B0 meson decay used is the well known anti-B0 → J/ψ π+ K− mode, where the π+ K− mass is consistent with that of the anti-K*0(892) meson. The ratio of lifetimes is measured to be 0.976 ± 0.012 ± 0.006, in agreement with theoretical expectations based on the heavy quark expansion. Using previous determinations of the anti-B0 meson lifetime, the Λ0b lifetime is found to be 1.482 ± 0.018 ± 0.012 ps. In both cases, the first uncertainty is statistical and the second systematic.

R. Aaij, B. Adeva, M. Adinolfi, C. Adrover, A. Affolder, Z. Ajaltouni, et al. (2013). Precision Measurement of the Λ0b Baryon Lifetime. PHYSICAL REVIEW LETTERS, 111(10), 1-8 [10.1103/PhysRevLett.111.102003].

Precision Measurement of the Λ0b Baryon Lifetime

CARBONE, ANGELO;GALLI, DOMENICO;PATRIGNANI, CLAUDIA;PERAZZINI, STEFANO;VAGNONI, VINCENZO MARIA;ZANGOLI, MARIA;
2013

Abstract

The ratio of the Λ0b baryon lifetime to that of the anti-B0 meson is measured using 1.0 fb^−1 of integrated luminosity in 7 TeV center-of-mass energy pp collisions at the LHC. The Λ0b baryon is observed for the first time in the decay mode Λ0b → J/ψ p K−, while the anti-B0 meson decay used is the well known anti-B0 → J/ψ π+ K− mode, where the π+ K− mass is consistent with that of the anti-K*0(892) meson. The ratio of lifetimes is measured to be 0.976 ± 0.012 ± 0.006, in agreement with theoretical expectations based on the heavy quark expansion. Using previous determinations of the anti-B0 meson lifetime, the Λ0b lifetime is found to be 1.482 ± 0.018 ± 0.012 ps. In both cases, the first uncertainty is statistical and the second systematic.
2013
R. Aaij, B. Adeva, M. Adinolfi, C. Adrover, A. Affolder, Z. Ajaltouni, et al. (2013). Precision Measurement of the Λ0b Baryon Lifetime. PHYSICAL REVIEW LETTERS, 111(10), 1-8 [10.1103/PhysRevLett.111.102003].
R. Aaij; B. Adeva; M. Adinolfi; C. Adrover; A. Affolder; Z. Ajaltouni; J. Albrecht; F. Alessio; M. Alexander; S. Ali; G. Alkhazov; P. Alvarez Cartelle...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/174074
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