Please use this identifier to cite or link to this item: http://hdl.handle.net/10261/40193
Share/Impact:
Título : Direct Top-Quark Width Measurement at CDF
Autor : Aaltonen, 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 clave : Heavy quarks
Decay
Physics
Fecha de publicación : 3-Dec-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
ISSN: 0031-9007
DOI: 10.1103/PhysRevLett.105.232003
Citación : Physical Review Letters 105(23): 232003 (2010)
Appears in Collections:(IFIC) Artículos
(IFCA) Artículos

Files in This Item:
File Description SizeFormat 
e232003.pdf218,26 kBAdobe PDFView/Open
Show full item record
 
CSIC SFX LinksSFX Query


Items in Digital.CSIC are protected by copyright, with all rights reserved, unless otherwise indicated.