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

Resultado de la investigaciónrevisión exhaustiva

25 Citas (Scopus)

Resumen

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.

Idioma originalEnglish
Número de artículo242002
Páginas (desde-hasta)1DUMMY
Número de páginas1
PublicaciónPhysical Review Letters
Volumen113
N.º24
DOI
EstadoPublished - 1 ene 2014
Publicado de forma externa

All Science Journal Classification (ASJC) codes

  • Física y astronomía (todo)

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