Observation of top quarks in the dilepton decay channel t{anti t} {yields} e({mu}){upsilon}{sub e({mu})} {tau}{upsilon}{sub {tau}} b{anti b} using hadronic tau decays at CDF

Conference · Sun Sep 01 04:00:00 EDT 1996

OSTI ID:438993

Hohlmann, M ^[1]

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1. Chicago Univ., IL (United States). Enrico Fermi Inst.

We present a search for dilepton events from top decays with one electron or muon and a hadronically decaying {tau} lepton. The total acceptance x efficiency is (O.119 {+-} 0.014({ital stat}))% for {ital m{sub top}} = 175 GeV. In 110 pb{sup -1} of data we expect 1.1 {+-} 0. 3({ital stat}) signal events and a total background of 1.96 {+-} 0.35({ital stat}) events while observing 4 candidate events (2 {ital e}{tau} and 2 {mu}{tau}). Three events are {ital b}-tagged. If a tag is required, the probability for the estimated background (0.225 {+-} 0.011 events) to fluctuate to {>=} 3 events is 0.13% (3.0 {sigma}). A first measurement of the {ital t{anti t}} production cross section based on these events yields {sigma}{sub t{anti t}} = 15.6{sup +18. 6}{sub -13.2}({ital stat}) pb.

• Research Organization: Fermi National Accelerator Lab., Batavia, IL (United States)
• Sponsoring Organization: USDOE Office of Energy Research, Washington, DC (United States)
• DOE Contract Number: AC02-76CH03000
• OSTI ID: 438993
• Report Number(s): FNAL/C--96/330-E; CONF-960291--2; ON: DE97050029; IN: CDF/PUB/TOP/PUBLIC/3650
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
B QUARKS
BACKGROUND RADIATION
BRANCHING RATIO
DATA ANALYSIS
HIGGS BOSONS
LEPTONIC DECAY
PARTICLE PRODUCTION
PROTON-ANTIPROTON INTERACTIONS
STANDARD MODEL
T QUARKS
TAU PARTICLES
VERIFICATION
W MINUS BOSONS
W PLUS BOSONS
WEAK HADRONIC DECAY
WEAK PARTICLE DECAY