TY - JOUR
T1 - Precision measurement of the mass and lifetime of the Ξ- b baryon
AU - LHCb Collaboration
AU - Aaij, R.
AU - Adeva, B.
AU - Adinolfi, M.
AU - Affolder, A.
AU - Ajaltouni, Z.
AU - Akar, S.
AU - Albrecht, J.
AU - Alessio, F.
AU - Alexander, M.
AU - Ali, S.
AU - Alkhazov, G.
AU - Alvarez Cartelle, P.
AU - Alves, A. A.
AU - Amato, S.
AU - Amerio, S.
AU - Amhis, Y.
AU - An, L.
AU - Anderlini, L.
AU - Anderson, J.
AU - Andreassen, R.
AU - Andreotti, M.
AU - Andrews, J. E.
AU - Appleby, R. B.
AU - Aquines Gutierrez, O.
AU - Archilli, F.
AU - Artamonov, A.
AU - Artuso, M.
AU - Aslanides, E.
AU - Auriemma, G.
AU - Baalouch, M.
AU - Bachmann, S.
AU - Back, J. J.
AU - Badalov, A.
AU - Baesso, C.
AU - Baldini, W.
AU - Barlow, R. J.
AU - Barschel, C.
AU - Barsuk, S.
AU - Barter, W.
AU - Batozskaya, V.
AU - Battista, V.
AU - Bay, A.
AU - Beaucourt, L.
AU - Beddow, J.
AU - Bedeschi, F.
AU - Bediaga, I.
AU - Blusk, S.
AU - Silva Coutinho, R.
AU - Skwarnicki, T.
AU - Stone, S.
N1 - Publisher Copyright:
© 2014 CERN, for the LHCb Collaboration.
PY - 2014
Y1 - 2014
N2 - 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 → Ξ0 cπ-, Ξ0 c → pK-K-π+, channel and the mass and lifetime are measured using the Λ0 b → Λ+ Cπ-, mode as a reference. We measure M (Ξ- b) - M(Λ0 b)= 178.36 ± 0.46 ± 0.16 MeV=c2, (τξ- B/τΛ0 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.
AB - 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 → Ξ0 cπ-, Ξ0 c → pK-K-π+, channel and the mass and lifetime are measured using the Λ0 b → Λ+ Cπ-, mode as a reference. We measure M (Ξ- b) - M(Λ0 b)= 178.36 ± 0.46 ± 0.16 MeV=c2, (τξ- B/τΛ0 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.
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U2 - 10.1103/PhysRevLett.113.242002
DO - 10.1103/PhysRevLett.113.242002
M3 - Article
AN - SCOPUS:84959854397
SN - 0031-9007
VL - 113
JO - Physical Review Letters
JF - Physical Review Letters
IS - 24
M1 - 242002
ER -