The ratio of the Λb0 baryon lifetime to that of the B ̄0 meson is measured using 1.0 fb-1 of integrated luminosity in 7 TeV center-of-mass energy pp collisions at the LHC. The Λb0 baryon is observed for the first time in the decay mode Λb0→J/ψpK-, while the B̄0 meson decay used is the well known B̄0→J/ψπ+K - mode, where the π+K- mass is consistent with that of the K̄*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 B̄0 meson lifetime, the Λb0 lifetime is found to be 1.482±0.018±0.012 ps. In both cases, the first uncertainty is statistical and the second systematic.

Aaij, R., Adeva, B., Adinolfi, M., Adrover, C., Affolder, A., Ajaltouni, Z., et al. (2013). Precision measurement of the Λb0 baryon lifetime. PHYSICAL REVIEW LETTERS, 111(10) [10.1103/PhysRevLett.111.102003].

Precision measurement of the Λb0 baryon lifetime

Calvi M.;Gotti C.;Martinelli M.;
2013

Abstract

The ratio of the Λb0 baryon lifetime to that of the B ̄0 meson is measured using 1.0 fb-1 of integrated luminosity in 7 TeV center-of-mass energy pp collisions at the LHC. The Λb0 baryon is observed for the first time in the decay mode Λb0→J/ψpK-, while the B̄0 meson decay used is the well known B̄0→J/ψπ+K - mode, where the π+K- mass is consistent with that of the K̄*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 B̄0 meson lifetime, the Λb0 lifetime is found to be 1.482±0.018±0.012 ps. In both cases, the first uncertainty is statistical and the second systematic.
Articolo in rivista - Articolo scientifico
LHC, flavour physics, baryon lifetime
English
2013
111
10
none
Aaij, R., Adeva, B., Adinolfi, M., Adrover, C., Affolder, A., Ajaltouni, Z., et al. (2013). Precision measurement of the Λb0 baryon lifetime. PHYSICAL REVIEW LETTERS, 111(10) [10.1103/PhysRevLett.111.102003].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/47862
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