Measurement of the {Lambda}{sub b}{sup 0} Lifetime in {Lambda}{sub b}{sup 0}->{Lambda}{sub c}{sup +}pi{sup -} Decays in pp Collisions at sq root(s)=1.96 TeV

Journal Article · Fri Mar 12 00:00:00 EST 2010 · Physical Review Letters

DOI:https://doi.org/10.1103/PHYSREVLETT.104.102002· OSTI ID:21386841

Aaltonen, T; Mehtala, P; Orava, R; Osterberg, K; Saarikko, H; Remortel, N van ^[1]; Adelman, J; Brubaker, E; Fedorko, W T; Grosso-Pilcher, C; Hurwitz, M; Ketchum, W; Kim, Y K; Krop, D; Kwang, S; Lee, H S; Schmidt, M A; Shiraishi, S; Shochet, M; Tang, J ^[2]

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1. Division of High Energy Physics, Department of Physics, University of Helsinki and Helsinki Institute of Physics, FIN-00014, Helsinki (Finland)
2. Enrico Fermi Institute, University of Chicago, Chicago, Illinois 60637 (United States)

We report a measurement of the lifetime of the {Lambda}{sub b}{sup 0} baryon in decays to the {Lambda}{sub c}{sup +}pi{sup -} final state in a sample corresponding to 1.1 fb{sup -1} collected in pp collisions at sq root(s)=1.96 TeV by the CDF II detector at the Tevatron collider. Using a sample of about 3000 fully reconstructed {Lambda}{sub b}{sup 0} events we measure {tau}({Lambda}{sub b}{sup 0})=1.401+-0.046(stat)+-0.035(syst) ps (corresponding to c{tau}({Lambda}{sub b}{sup 0})=420.1+-13.7(stat)+-10.6(syst) {mu}m, where c is the speed of light). The ratio of this result and the world average B{sup 0} lifetime yields {tau}({Lambda}{sub b}{sup 0})/tau(B{sup 0})=0.918+-0.038 (stat) and (syst), in good agreement with recent theoretical predictions.

• OSTI ID: 21386841
• Journal Information: Physical Review Letters, Vol. 104, Issue 10; Other Information: DOI: 10.1103/PhysRevLett.104.102002; (c) 2010 The American Physical Society; ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
B NEUTRAL MESONS
EXPERIMENTAL DATA
FERMILAB COLLIDER DETECTOR
FERMILAB TEVATRON
LAMBDA C PLUS BARYONS
LIFETIME
PARTICLE DECAY
PIONS MINUS
PROTON-PROTON INTERACTIONS
TEV RANGE
ACCELERATORS
B MESONS
BARYON-BARYON INTERACTIONS
BARYONS
BEAUTY MESONS
BEAUTY PARTICLES
BOSONS
CHARM PARTICLES
CHARMED BARYONS
CYCLIC ACCELERATORS
DATA
DECAY
ELEMENTARY PARTICLES
ENERGY RANGE
FERMIONS
HADRON-HADRON INTERACTIONS
HADRONS
INFORMATION
INTERACTIONS
MEASURING INSTRUMENTS
MESONS
NUCLEON-NUCLEON INTERACTIONS
NUMERICAL DATA
PARTICLE INTERACTIONS
PIONS
PROTON-NUCLEON INTERACTIONS
PSEUDOSCALAR MESONS
RADIATION DETECTORS
SYNCHROTRONS