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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.

Direct Top-Quark Width Measurement at CDF / T., A., B. A., G., S., A., D., A., A., A., A., A., J., A., G., A., J. A., A., A., A., T., A., A., A., J., A., W., A., B., A., A., A., F., A., W., B., A., B.G., V. E., B., et al.. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 105:23(2010), p. 232003. [10.1103/physrevlett.105.232003]

Direct Top-Quark Width Measurement at CDF

S. D. Cecco;GIAGU, Stefano;IORI, Maurizio;MARGAROLI, Fabrizio;
2010

Abstract

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.
2010
01 Pubblicazione su rivista::01a Articolo in rivista
Direct Top-Quark Width Measurement at CDF / T., A., B. A., G., S., A., D., A., A., A., A., A., J., A., G., A., J. A., A., A., A., T., A., A., A., J., A., W., A., B., A., A., A., F., A., W., B., A., B.G., V. E., B., et al.. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 105:23(2010), p. 232003. [10.1103/physrevlett.105.232003]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/493630
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