Direct Top-Quark Width Measurement at CDF

Journal Article · Fri Dec 03 04:00:00 EST 2010 · Physical Review Letters

DOI:https://doi.org/10.1103/PHYSREVLETT.105.232003· OSTI ID:21554437

Aaltonen, T; Brucken, E; Devoto, F; Mehtala, P; Orava, R ^[1]; Alvarez Gonzalez, B; Casal, B; Cuevas, J; Gomez, G; Palencia, E; Rodrigo, T; Ruiz, A; Scodellaro, L; Vila, I; Vilar, R ^[2]; Amerio, S; Gresele, A; Lazzizzera, I ^[3]; Amidei, D; Campbell, M ^[4]

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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. Instituto de Fisica de Cantabria, CSIC-University of Cantabria, 39005 Santander (Spain)
3. Istituto Nazionale di Fisica Nucleare, Sezione di Padova-Trento, I-35131 Padova (Italy)
4. University of Michigan, Ann Arbor, Michigan 48109 (United States)

We present a measurement of the top-quark width in the lepton+jets decay channel of tt events produced in pp collisions at Fermilab's Tevatron collider and collected by the CDF II detector. From a data sample corresponding to 4.3 fb{sup -1} of integrated luminosity, we identify 756 candidate events. The top-quark mass and the mass of the hadronically decaying W boson that comes from the top-quark decay are reconstructed for each event and compared with templates of different top-quark widths ({Gamma}{sub t}) and deviations from nominal jet energy scale ({Delta}{sub JES}) to perform a simultaneous fit for both parameters, where {Delta}{sub JES} is used for the in situ calibration of the jet energy scale. By applying a Feldman-Cousins approach, we establish an upper limit at 95% confidence level (CL) of {Gamma}{sub t}<7.6 GeV and a two-sided 68% CL interval of 0.3 GeV<{Gamma}{sub t}<4.4 GeV for a top-quark mass of 172.5 GeV/c{sup 2}, which are consistent with the standard model prediction.

• OSTI ID: 21554437
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 23 Vol. 105; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ACCELERATORS
BARYON-BARYON INTERACTIONS
BOSONS
CALIBRATION
CYCLIC ACCELERATORS
DECAY
DIMENSIONS
ELEMENTARY PARTICLES
ENERGY RANGE
FERMILAB COLLIDER DETECTOR
FERMILAB TEVATRON
FERMIONS
FIELD THEORIES
GEV RANGE
GEV RANGE 01-10
GEV RANGE 100-1000
GRAND UNIFIED THEORY
HADRON-HADRON INTERACTIONS
INTERACTIONS
INTERMEDIATE BOSONS
INTERMEDIATE VECTOR BOSONS
JETS
LEPTONS
LUMINOSITY
MASS
MATHEMATICAL MODELS
MEASURING INSTRUMENTS
NUCLEON-NUCLEON INTERACTIONS
OPTICAL PROPERTIES
PARTICLE INTERACTIONS
PARTICLE MODELS
PHYSICAL PROPERTIES
POSTULATED PARTICLES
PROTON-NUCLEON INTERACTIONS
PROTON-PROTON INTERACTIONS
QUANTUM FIELD THEORY
QUARKS
RADIATION DETECTORS
STANDARD MODEL
SYNCHROTRONS
T QUARKS
TOP PARTICLES
UNIFIED GAUGE MODELS
W MINUS BOSONS
W PLUS BOSONS
WIDTH