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Direct Top-Quark Width Measurement at CDF

AutorAaltonen, T.; Cabrera, Susana ; Cuenca Almenar, Cristóbal ; Álvarez González, B.; Casal, Bruno ; Cuevas, Javier ; Gómez, G. ; Rodrigo, Teresa ; Ruiz Jimeno, Alberto ; Scodellaro, Luca ; Vila, Iván ; Vilar, Rocío
Palabras claveHeavy quarks
Decay
Physics
Fecha de publicación3-dic-2010
EditorAmerican Physical Society
CitaciónPhysical Review Letters 105(23): 232003 (2010)
ResumenWe present a measurement of the top-quark width in the lepton + jets decay channel of t (t) over bar events produced in p (p) over bar collisions at Fermilab's Tevatron collider and collected by the CDF II detector. From a data sample corresponding to 4.3 fb(-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(t)) and deviations from nominal jet energy scale (Delta(JES)) to perform a simultaneous fit for both parameters, where Delta(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(t) < 7.6 GeV and a two-sided 68% CL interval of 0.3 GeV < Gamma(t) < 4.4 GeV for a top-quark mass of 172.5 GeV/c(2), which are consistent with the standard model prediction.
Descripción7 páginas, 2 figuras, 2 tablas.-- CDF Collaboration: et al.
Versión del editorhttp://dx.doi.org/10.1103/PhysRevLett.105.232003
URIhttp://hdl.handle.net/10261/40193
DOI10.1103/PhysRevLett.105.232003
ISSN0031-9007
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