TY  - JOUR
AU  - LHCb Collaboration (Aaij, R. et al
AU  - Martinez-Vidal, F.
AU  - Oyanguren, A.
AU  - Ruiz Valls, P.
AU  - Sanchez Mayordomo, C.
PY  - 2014
DA  - 2014//
TI  - Precision Measurement of the Mass and Lifetime of the Xi(-)(b) Baryon
T2  - Phys. Rev. Lett.
JO  - Physical Review Letters
SP  - 242002
EP  - 9pp
VL  - 113
IS  - 24
PB  - Amer Physical Soc
AB  - We report on measurements of the mass and lifetime of the Xi(-)(b) baryon using about 1800 Xi(-)(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 Xi(-)(b) -> Xi(0)(c)pi(-), Xi(0)(c) -> pK(-)K(-)pi(+) channel and the mass and lifetime are measured using the Lambda(0)(b) -> Lambda(+)(c)pi(-) mode as a reference. We measure M(Xi(-)(b)) – M(Lambda(0)(b)) = 178.36 +/- 0.46 +/- 0.16 MeV/c(2), (tau Xi(-)(b)/tau Lambda(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 Xi(-)(b) mass and lifetime compared to previous best measurements, and are consistent with theoretical expectations.
SN  - 0031-9007
UR  - http://arxiv.org/abs/1409.8568
UR  - https://doi.org/10.1103/PhysRevLett.113.242002
DO  - 10.1103/PhysRevLett.113.242002
LA  - English
N1  - WOS:000346387700009
ID  - LHCbCollaborationAaij_etal2014
ER  -