B Lifetimes and X,Y,Z States at the Tevatron
A measurement of b-hadron lifetimes in the fully reconstructed decay modes B{sup +} {yields} J/{psi}K{sup +}, B{sup 0} {yields} J/{psi}K*{sup 0}, B{sup 0} {yields} J/{psi}K{sub S}{sup 0}, and {Lambda}{sub b}{sup 0} {yields} J/{psi} {Lambda}{sup 0} is reported using data corresponding to an integrated luminosity of 4.3 fb{sup -1}, collected by the CDF II detector at the Fermilab Tevatron. The measured values are {tau}(B{sup +}) = 1.639 {+-} 0.009(stat) {+-} 0.009(syst) ps, {tau}(B{sup 0}) = 1.507 {+-} 0.010(stat) {+-} 0.008(syst) ps and {tau}({Lambda}{sub b}{sup 0}) = 1.537 {+-} 0.045(stat) {+-} 0.014(syst) ps. The lifetime ratios are {tau}(B{sup +})/{tau}(B{sup 0}) - 1.088 {+-} 0.009(stat) {+-} 0.004(syst) and {tau}({Lambda}{sub b}{sup 0})/{tau}(B{sup 0}) = 1.020 {+-} 0.030(stat) {+-} 0.008(syst). These are the most precise measurements of these quantities from a single experiment. Observation is also reported for a structure near the J/{psi}{phi} threshold, in B{sup +} to J/{psi}{phi}K{sup +} decays with an integrated luminosity of 6.0 fb{sup -1} and a statistical significance of 5 standard deviations. There are 19 {+-} 6 events observed for this structure at a mass of 4143.4{sub -3.0}{sup +2.9} {+-} 0.6 MeV/c{sup 2} and a width of 15.3{sub -6.1}{sup +10.4} {+-} 2.5 MeV/c{sup 2}.
- Research Organization:
- Fermi National Accelerator Laboratory (FNAL), Batavia, IL
- Sponsoring Organization:
- DOE Office of Science
- DOE Contract Number:
- AC02-07CH11359
- OSTI ID:
- 1019044
- Report Number(s):
- FERMILAB-CONF-11-226-PPD
- Country of Publication:
- United States
- Language:
- English
Similar Records
New measurement of b-hadron lifetimes at CDF
Measurement of the Lambda(b) lifetime in the exclusive decay Lambda(b) ---> J / psi Lambda