Precision Measurement of the Lambda(0)(b) Baryon Lifetime

Aaij, R.; Adeva, B.; Adinolfi, M.; Adrover, C.; Affolder, A.; Ajaltouni, Z.; Albrecht, J.; Alessio, F.; Alexander, M.; Ali, S.; Alkhazov, G.; Alvarez Cartelle, P.; Alves, A. A. Jr.; Amato, S.; Amerio, S.; Amhis, Y.; Anderlini, L.; Anderson, J.; Andreassen, R.; Andrews, J. E.; Appleby, R. B.; Gutierrez, O. Aquines; Archilli, F.; Artamonov, A.; Artuso, M.; Aslanides, E.; Auriemma, G.; Baalouch, M.; Bachmann, S.; Back, J. J.; Baesso, C.; Balagura, V.; Baldini, W.; Barlow, R. J.; Barschel, C.; Barsuk, S.; Barter, W.; Bauer, Th.; Bay, A.; Beddow, J.; Bedeschi, F.; Bediaga, I.; Belogurov, S.; Belous, K.; Belyaev, I.; Ben-Haim, E.; Bencivenni, G.; Benson, S.; Benton, J.; Berezhnoy, A.; Bernet, R.; Bettler, M.-O.; Van Beuzekom, M.; Bien, A.; Bifani, S.; Bird, T.; Bizzeti, A.; Bjornstad, P. M.; Blake, T.; Blanc, F.; Blouw, J.; Blusk, S.; Bocci, V.; Bondar, A.; Bondar, N.; Bonivento, W.; Borghi, S.; Borgia, A.; Bowcock, T. J. V.; Bowen, E.; Bozzi, C.; Brambach, T.; Van Den Brand, J.; Bressieux, J.; Brett, D.; Britsch, M.; Britton, T.; Brook, N. H.; Brown, H.; Burducea, I.; Bursche, A.; Busetto, G.; Buytaert, J.; Cadeddu, S.; Callot, O.; Calvi, M.; Calvo Gomez, M.; Camboni, A.; Campana, P.; Perez, D. Campora; Carbone, A.; Carboni, G.; Cardinale, R.; Cardini, A.; Carranza-Mejia, H.; Carson, L.; Carvalho Akiba, K.; Casse, G.; Garcia, L. Castillo; Cattaneo, M.

doi:10.1103/PhysRevLett.111.102003

research article

Precision Measurement of the Lambda(0)(b) Baryon Lifetime

Aaij, R.

•

Adeva, B.

•

Adinolfi, M.

2013

Physical Review Letters

The ratio of the Lambda(0)(b) baryon lifetime to that of the (B) over bar (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 Lambda(0)(b) baryon is observed for the first time in the decay mode Lambda(0)(b) -> J/psi pK(-), while the (B) over bar (0) meson decay used is the well known (B) over bar (0) J/psi pi K-+(-) mode, where the pi K-+(-) mass is consistent with that of the (K) over bar*(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) over bar (0) meson lifetime, the Lambda(0)(b) lifetime is found to be 1.482 +/- 0.018 +/- 0.012 ps. In both cases, the first uncertainty is statistical and the second systematic.