Precision measurement of the mass and lifetime of the Ξbâ» baryon.
Phys Rev Lett
; 113(24): 242002, 2014 Dec 12.
Article
en En
| MEDLINE
| ID: mdl-25541768
ABSTRACT
We report on measurements of the mass and lifetime of the Ξ(b)â» baryon using about 1800 Ξ(b)â» decays reconstructed in a proton-proton collision data set corresponding to an integrated luminosity of 3.0 fb⻹ collected by the LHCb experiment. The decays are reconstructed in the Ξ(b)â»âΞ(c)°πâ», Ξ(c)°âpKâ»Kâ»π⺠channel and the mass and lifetime are measured using the Λ(b)°âΛ(c)âºπâ» mode as a reference. We measure M(Ξ(b)â»)-M(Λ(b)°)=178.36±0.46±0.16 MeV/c², (τ(Ξ(b)â»)/τ(Λ(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)â» mass and lifetime compared to previous best measurements, and are consistent with theoretical expectations.
Buscar en Google
Colección:
01-internacional
Base de datos:
MEDLINE
Idioma:
En
Revista:
Phys Rev Lett
Año:
2014
Tipo del documento:
Article
País de afiliación:
Países Bajos