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Título: | Direct Top-Quark Width Measurement at CDF |
Autor: | Aaltonen, T.; Cabrera, Susana CSIC ORCID; Cuenca Almenar, Cristóbal CSIC; Álvarez González, B.; Casal, Bruno CSIC; Cuevas, Javier CSIC ORCID; Gómez, Gervasio CSIC ORCID ; Rodrigo, Teresa CSIC ORCID ; Ruiz Jimeno, Alberto CSIC ORCID ; Scodellaro, Luca CSIC ORCID ; Vila, Iván CSIC ORCID; Vilar Cortabitarte, R. CSIC ORCID | Palabras clave: | Heavy quarks Decay Physics |
Fecha de publicación: | 3-dic-2010 | Editor: | American Physical Society | Citación: | Physical Review Letters 105(23): 232003 (2010) | Resumen: | We 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. | Descripción: | 7 páginas, 2 figuras, 2 tablas.-- CDF Collaboration: et al. | Versión del editor: | http://dx.doi.org/10.1103/PhysRevLett.105.232003 | URI: | http://hdl.handle.net/10261/40193 | DOI: | 10.1103/PhysRevLett.105.232003 | ISSN: | 0031-9007 |
Aparece en las colecciones: | (IFIC) Artículos (IFCA) Artículos |
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e232003.pdf | 218,26 kB | Adobe PDF | Visualizar/Abrir |
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