Precision measurement of the mass and lifetime of the Ξ<sup>-</sup><inf>b</inf> baryon

R. Aaij, B. Adeva, M. Adinolfi, A. Affolder, Z. Ajaltouni, S. Akar, J. Albrecht, F. Alessio, M. Alexander, S. Ali, G. Alkhazov, P. Alvarez Cartelle, A. A. Alves, S. Amato, S. Amerio, Y. Amhis, L. An, L. Anderlini, J. Anderson, R. AndreassenM. Andreotti, J. E. Andrews, R. B. Appleby, O. Aquines Gutierrez, F. Archilli, A. Artamonov, M. Artuso, E. Aslanides, G. Auriemma, M. Baalouch, S. Bachmann, J. J. Back, A. Badalov, C. Baesso, W. Baldini, R. J. Barlow, C. Barschel, S. Barsuk, W. Barter, V. Batozskaya, V. Battista, A. Bay, L. Beaucourt, J. Beddow, F. Bedeschi, I. Bediaga, S. Belogurov, K. Belous, I. Belyaev, E. Ben-Haim, G. Bencivenni, S. Benson, J. Benton, A. Berezhnoy, R. Bernet, M. O. Bettler, M. Van Beuzekom, A. Bien, S. Bifani, T. Bird, A. Bizzeti, P. M. Bjørnstad, T. Blake, F. Blanc, J. Blouw, S. Blusk, V. Bocci, A. Bondar, N. Bondar, W. Bonivento, S. Borghi, A. Borgia, M. Borsato, T. J.V. Bowcock, E. Bowen, C. Bozzi, T. Brambach, D. Brett, M. Britsch, T. Britton, J. Brodzicka, N. H. Brook, H. Brown, A. Bursche, J. Buytaert, S. Cadeddu, R. Calabrese, M. Calvi, M. Calvo Gomez

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25 Citations (Scopus)

Abstract

We report on measurements of the mass and lifetime of the Ξ - b baryon using about 1800 Ξ - b decays reconstructed in a proton-proton collision data set corresponding to an integrated luminosity of 3.0 fb -1, collected by the LHCb experiment. The decays are reconstructed in the Ξ - b → Ξ 0 cπ -, Ξ 0 c → pK -K -π +, channel and the mass and lifetime are measured using the Λ 0 b → Λ + Cπ -, mode as a reference. We measure M (Ξ - b) - M(Λ 0 b)= 178.36 ± 0.46 ± 0.16 MeV=c 2, (τξ - B/τΛ 0 b) = 1.089 ± 0.026 ± 0.011, where the uncertainties are statistical and systematic, respectively. These results lead to a factor of 2 better precision on the Ξ - b mass and lifetime compared to previous best measurements, and are consistent with theoretical expectations.

Original languageEnglish
Article number242002
Pages (from-to)1DUMMY
Number of pages1
JournalPhysical Review Letters
Volume113
Issue number24
DOIs
Publication statusPublished - 1 Jan 2014
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2014 CERN, for the LHCb Collaboration.

Copyright:
Copyright 2020 Elsevier B.V., All rights reserved.

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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