Direct Top-Quark Width Measurement at CDF
Author(s)
Gomez-Ceballos, Guillelmo; Goncharov, Maxim; Makhoul, Khaldoun; Paus, Christoph M. E.; Bauer, Gerry P
DownloadAaltonen-2010-Direct Top-Quark Wid.pdf (218.2Kb)
PUBLISHER_POLICY
Publisher Policy
Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
Terms of use
Metadata
Show full item recordAbstract
We present a measurement of the top-quark width in the lepton+jets decay channel of tt̅ events produced in pp̅ collisions at Fermilab’s Tevatron collider and collected by the CDF II detector. From a data sample corresponding to 4.3 fb-1 [fb superscript -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 (Γt) [gamma subscript t] and deviations from nominal jet energy scale (ΔJES)[delta subscript JES] to perform a simultaneous fit for both parameters, where ΔJES [delta subscript 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 Γt<7.6 GeV [gamma subscript t<7.6 GeV] and a two-sided 68% CL interval of 0.3 GeV<Γt<4.4 GeV [GeV<gamma subscript t<4.4 GeV]] for a top-quark mass of 172.5 GeV/c2 [GeV / c superscript 2], which are consistent with the standard model prediction.
Date issued
2010-12Department
Massachusetts Institute of Technology. Department of Physics; Massachusetts Institute of Technology. Laboratory for Nuclear ScienceJournal
Physical review letters
Publisher
American Physical Society
Citation
Aaltonen, T. et al. “Direct Top-Quark Width Measurement at CDF.” Physical Review Letters 105.23 (2010) : n. pag. © 2010 The American Physical Society
Version: Final published version
ISSN
0031-9007