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 B¯0 meson decay used is the well known B¯0→J/ψπ+K- mode, where the π+K- mass is consistent with that of the 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 B¯0 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.

Precision Measurement of the Λ_{b}^{0} Baryon Lifetime

BALDINI, Wander;BOZZI, Concezio;FIORE, Marco;SAVRIE', Mauro;
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 B¯0 meson decay used is the well known B¯0→J/ψπ+K- mode, where the π+K- mass is consistent with that of the 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 B¯0 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.
2013
R., Aaij; B., Adeva; M., Adinolfi; C., Adrover; A., Affolder; Z., Ajaltouni; J., Albrecht; F., Alessio; M., Alexander; S., Ali; G., Alkhazov; P., Alva...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11392/2092412
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