B-lifetime measurements at CDF

Technical Report · Tue Jun 01 04:00:00 EDT 1993

DOI:https://doi.org/10.2172/10173447· OSTI ID:10173447

Wenzel, H ^[1]

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1. Fermi National Accelerator Lab., Batavia, IL (United States)

The average b-hadron lifetime has been measured using a high statistics sample of B {yields} J/{psi}X decays recorded with the Collider Detector at Fermilab. The decay vertices of J/{psi} {yields} {mu}{sup +}{mu}{sup {minus}} candidates have been reconstructed using information from a silicon vertex-detector. The measured B lifetime, which is the average over all b-hadrons produced in p{bar p} collisions at {radical}s = 1.8 TeV, weighted by their branching ratios into J/{psi} is: {tau}B = 1.46 {plus_minus} 0.06(stat.) {plus_minus} 0.06(sys.)ps (preliminary); In addition we used the fully reconstructed final states B{sup {plus_minus}} {yields} J/{psi}K{sup {plus_minus}} and B{sup 0} {yields} J/{psi}K{sup 0}* to measure the exclusive lifetime of charged and neutral B-mesons. We measure: {tau}{sub B}{sup {plus_minus}} = 1.59 {plus_minus} 0.27(stat.) {plus_minus} 0.17(sys.) ps (preliminary); {tau}{sub B}{sup 0} = 1. 34 {plus_minus} 0.31 (stat.) {plus_minus} 0.17 (sys.) ps (preliminary); From this we obtain the following result for the lifetime ratio: {tau}{sub B}{sup {plus_minus}}/{tau} {sub B}{sup 0} = 1.19 {plus_minus} 0.35(stat.) {plus_minus} 0.12(sys.) (preliminary); This represents the first measurements of the b-lifetime at a hadron collider.

• Research Organization: Fermi National Accelerator Lab., Batavia, IL (United States)
• Sponsoring Organization: USDOE, Washington, DC (United States)
• DOE Contract Number: AC02-76CH03000
• OSTI ID: 10173447
• Report Number(s): FNAL/C--93/159-E; CONF-9303171--4; ON: DE93017266
• Country of Publication: United States
• Language: English

Related Subjects

662350
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
B MESONS
BRANCHING RATIO
DECAYS OF MESONS
EXPERIMENTAL DATA
FERMILAB COLLIDER DETECTOR
HADRONIC PARTICLE DECAY
J PSI-3097 MESONS
LIFETIME
PROTON-ANTIPROTON INTERACTIONS