Journal Article

Measurements of theB⁺ ,B⁰ ,B_(s)⁰meson andΛ_(b)⁰baryon lifetimes

Blouw, J., Blusk, S., Blake, T., Britton, T., Barsuk, S., Casse, G., Alexander, M., Aaij, R., Anderlini, L., Cardinale, R., Calvo Gomez, M., Balagura, V., Barlow, R. J., Alkhazov, G., Carvalho Akiba, K., Brook, N. H., Bien, A., Cardini, A., Bedeschi, F., Belous, K., Alves Jr, A. A., Benton, J., Bonivento, W., Calabrese, R., Adeva, B., Affolder, A., Andreassen, R., Bencivenni, G., Bettler, M. -O., Bondar, N., Anderson, J., Bifani, S., Badalov, A., Bauer, Th, Bozzi, C., Carson, L., Barter, W., Blanc, F., Adinolfi, M., Aslanides, E., Bowcock, T. J. V., Campora Perez, D., Andreotti, M., Borgia, A., Albrecht, J., Ajaltouni, Ziad Zj, Bjørnstad, P. M., Amhis, Y., Back, J. J., Carboni, G., Belyaev, I., Carbone, A., Brown, H., Aquines Gutierrez, O., Baldini, W., Brambach, T., Barschel, C., Bressieux, J., Amerio, S., Berezhnoy, A., Camboni, A., Bocci, V., Busetto, G., van Den Brand, J., Bowen, E., Bachmann, S., Cadeddu, S., Artuso, M., Bernet, R., Borsato, M., Ali, S., Callot, O., Auriemma, G., Artamonov, A., Archilli, F., Brett, D., Appleby, R. B., Beddow, J., Bediaga, I., Bird, T., Calvi, M., Batozskaya, V., Borghi, S., Baalouch, M., van Beuzekom, M., Beloguro

2014

Overview

Measurements ofb -hadron lifetimes are reported usingppcollision data, corresponding to an integrated luminosity of 1.0fb ⁻¹ , collected by the LHCb detector at a centre-of-mass energy of7 Tev. Using the exclusive decaysB⁺→ J/ψ K⁺ ,B⁰→ J/ψ K^(*)(892)⁰ ,B⁰→ J/ψ K⁰_(\\rm S) ,Λ_(b)⁰→ J/ψ ΛandB⁰_(s)→ J/ψ φthe average decay times in these modes are measured to beτ_(B⁺→ J/ψ K⁺)=1.637 ±0.004±0.003 ps,τ_(B⁰→ J/ψ K^(*)(892)⁰)=1.524 ±0.006±0.004 ps,τ_(B⁰→ J/ψ K⁰_(\\rm S))=1.499 ±0.013±0.005 ps,τ_(Λ_(b)⁰→ J/ψ Λ)=1.415 ±0.027±0.006 ps andτ_(B⁰_(s)→ J/ψ φ)=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,ΔΓ_(d) , to the average width,Γ_(d) , in theB⁰system,Δ Γ_(d)/Γ_(d) = -0.044 ± 0.025 ± 0.011 , are reported. All quantities are found to be consistent with Standard Model expectations.

• Publisher: Springer
• Subject: High Energy Physics - Experiment / Physics