Precision measurement of the Lambda_b baryon lifetime
Creators: name: LHCb Collaboration
name: Aaij, R.
name: Adeva, B.
name: Adinolfi, M.
name: Adrover, C.
name: Affolder, A.
name: Ajaltouni, Z.
name: Albrecht, J.
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name: Alexander, M.
name: Ali, S.
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name: Cartelle, P. Alvarez
name: Alves, A. A.
name: Amato, S.
name: Amerio, S.
name: Amhis, Y.
name: Anderlini, L.
name: Anderson, J.
name: Andreassen, R.
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name: Appleby, R. B.
name: Gutierrez, O. Aquines
name: Archilli, F.
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name: Artuso, M.
name: Aslanides, E.
name: Auriemma, G.
name: Baalouch, M.
name: Bachmann, S.
name: Back, J. J.
name: Baesso, C.
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name: Baldini, W.
name: Barlow, R. J.
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name: Bauer, Th.
name: Bay, A.
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name: Bedeschi, F.
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name: Belogurov, S.
name: Belous, K.
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name: Bencivenni, G.
name: Benson, S.
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name: Berezhnoy, A.
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name: Bettler, M. -O.
name: van Beuzekom, M.
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name: Bjørnstad, P. M.
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name: Borghi, S.
name: Borgia, A.
name: Bowcock, T. J. V.
name: Bowen, E.
name: Bozzi, C.
name: Brambach, T.
name: Brand, J. van den
name: Bressieux, J.
name: Brett, D.
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name: Brook, N. H.
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name: Burducea, I.
name: Bursche, A.
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name: Gomez, M. Calvo
name: Camboni, A.
name: Campana, P.
name: Perez, D. Campora
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name: Carboni, G.
name: Cardinale, R.
name: Cardini, A.
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name: Carson, L.
name: Akiba, K. Carvalho
name: Casse, G.
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name: Cattaneo, M.
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Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: High Energy Physics - Lattice (hep-lat)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences
subject: FOS: Physical sciences

description: The ratio of the Λb baryon lifetime to that of the B0 meson is measured using 1.0/fb of integrated luminosity in 7 TeV center-of-mass energy pp collisions at the LHC. The Λb baryon is observed for the first time in the decay mode Λb -&gt; J/ψpK-, while the B0 meson decay used is the well known B0 -&gt; J/ψpi+K- mode, where the pi+ 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 B0 meson lifetime, the Λb lifetime is found to be 1.482 +/- 0.018 +/- 0.012 ps. In both cases the first uncertainty is statistical and the second systematic.
description: 11 pages 6 figures, v2 minor corrections