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Mass and lifetime measurements of bottom and charm baryons in p¯p collisions at vs=1.96??TeV

Abstract: We report on mass and lifetime measurements of several ground state charmed and bottom baryons, using a data sample corresponding to 9.6??fb-1 from p¯p collisions at vs=1.96??TeV and recorded with the Collider Detector at Fermilab. Baryon candidates are reconstructed from data collected with an online event selection designed for the collection of long-lifetime heavy-flavor decay products and a second event selection designed to collect J/??µ+µ- candidates. First evidence for the process O-b?O0cp- is presented with a significance of 3.3s. We measure the following baryon masses: M(?0c)=2470.85±0.24(stat)±0.55(syst)??MeV/c2, M(?+c)=2468.00±0.18(stat)±0.51(syst)??MeV/c2, M(?b)=5620.15±0.31(stat)±0.47(syst)??MeV/c2, M(?-b)=5793.4±1.8(stat)±0.7(syst)??MeV/c2, M(?0b)=5788.7±4.3(stat)±1.4(syst)??MeV/c2, and M(O-b)=6047.5±3.8(stat)±0.6(syst)??MeV/c2. The isospin splitting of the ?-,0b states is found to be M(?-b)-M(?0b)=4.7±4.7(stat)±0.7(syst)??MeV/c2. The isospin splitting of the ?0,+c states is found to be M(?0c)-M(?+c)=2.85±0.30(stat)±0.04(syst)??MeV/c2. The following lifetime measurements are made: t(?b)=1.565±0.035(stat)±0.020(syst)??ps, t(?-b)=1.32±0.14(stat)±0.02(syst)??ps, t(O-b)=1.66+0.53-0.40(stat)±0.02(syst)??ps.

 Fuente: Phys. Rev. D, Vol. 89, Num. 7, Pag. 072014 (2014)

 Editorial: American Physical Society

 Fecha de publicación: 01/04/2014

 Nº de páginas: 15

 Tipo de publicación: Artículo de Revista

 DOI: 10.1103/PhysRevD.89.072014

 ISSN: 1550-7998,1550-2368,2470-0010,2470-0029

 Proyecto español: FPA2014-55295-C3-1-R ; FPA 2011-28694-C02-01

 Url de la publicación: https://doi.org/10.1103/PhysRevD.89.072014

Autoría

AALTONEN, TIMO ANTERO

BRUNO CASAL LARAÑA

FRANCISCO JAVIER CUEVAS MAESTRO

JOSE ENRIQUE PALENCIA CORTEZON