Measurements of b-hadron lifetimes are reported using pp collision data, corresponding to an integrated luminosity of 1.0 fb−1, collected by the LHCb detector at a centreof- mass energy of 7TeV. Using the exclusive decays B+ ! J/ K+, B0 ! J/ K(892)0, B0 ! J/ K0 s , 0b ! J/ and B0 s ! J/ the average decay times in these modes are measured to be B+!J/ K+ = 1.637 ± 0.004 ± 0.003 ps, B0!J/ K0 = 1.524 ± 0.006 ± 0.004 ps, B0!J/ K0 s = 1.499 ± 0.013 ± 0.005 ps, 0 b !J/ = 1.415 ± 0.027 ± 0.006 ps, B0 s!J/ = 1.480 ± 0.011 ± 0.005 ps, where the first uncertainty is statistical and the second is systematic. These represent the most precise lifetime measurements in these decay modes. In addition, ratios of these lifetimes, and the ratio of the decay-width difference, d, to the average width, d, in the B0 system, d/d = −0.044 ± 0.025 ± 0.011, are reported. All quantities are found to be consistent with Standard Model expectations.

Measurements of the B +, B 0, $ B_s^0 $ meson and $ \Lambda_b^0 $ baryon lifetimes

ANDREOTTI, Mirco;CALABRESE, Roberto;FIORE, Marco;FIORINI, Massimiliano;LUPPI, Eleonora;MANZALI, Matteo;PAPPALARDO, Luciano Libero;SAVRIE', Mauro;TELLARINI, Giulia;TOMASSETTI, Luca;
2014

Abstract

Measurements of b-hadron lifetimes are reported using pp collision data, corresponding to an integrated luminosity of 1.0 fb−1, collected by the LHCb detector at a centreof- mass energy of 7TeV. Using the exclusive decays B+ ! J/ K+, B0 ! J/ K(892)0, B0 ! J/ K0 s , 0b ! J/ and B0 s ! J/ the average decay times in these modes are measured to be B+!J/ K+ = 1.637 ± 0.004 ± 0.003 ps, B0!J/ K0 = 1.524 ± 0.006 ± 0.004 ps, B0!J/ K0 s = 1.499 ± 0.013 ± 0.005 ps, 0 b !J/ = 1.415 ± 0.027 ± 0.006 ps, B0 s!J/ = 1.480 ± 0.011 ± 0.005 ps, where the first uncertainty is statistical and the second is systematic. These represent the most precise lifetime measurements in these decay modes. In addition, ratios of these lifetimes, and the ratio of the decay-width difference, d, to the average width, d, in the B0 system, d/d = −0.044 ± 0.025 ± 0.011, are reported. All quantities are found to be consistent with Standard Model expectations.
2014
R., Aaij; B., Adeva; M., Adinolfi; 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/11392/2099219
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