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First simultaneous measurement of the top quark mass in the lepton + jets and dilepton channels at CDF

Author(s)
Bauer, Gerry P; Choudalakis, Georgios; Gomez-Ceballos, Guillelmo; Hahn, Kristian Allan; Henderson, Conor; Knuteson, Bruce O; Makhoul, Khaldoun; Paus, Christoph M. E.; Xie, Si; ... Show more Show less
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Abstract
We present a measurement of the mass of the top quark using data corresponding to an integrated luminosity of 1.9fb[superscript -1] of pp̄ collisions collected at √s = 1.96TeV with the CDF II detector at Fermilab's Tevatron. This is the first measurement of the top quark mass using top-antitop pair candidate events in the lepton+jets and dilepton decay channels simultaneously. We reconstruct two observables in each channel and use a nonparametric kernel density estimation technique to derive two-dimensional probability density functions from simulated signal and background samples. The observables are the top quark mass and the invariant mass of two jets from the W decay in the lepton+jets channel, and the top quark mass and the scalar sum of transverse energy of the event in the dilepton channel. We perform a simultaneous fit for the top quark mass and the jet energy scale, which is constrained in situ by the hadronic W boson mass. Using 332 lepton+jets candidate events and 144 dilepton candidate events, we measure the top quark mass to be M[subscript top] = 171.9 ± 1.7(stat+JES)±1.1(othersyst) GeV/c[superscript 2] = 171.9 ± 2.0 GeV/c[superscript 2].
Date issued
2009-05
URI
http://hdl.handle.net/1721.1/119009
Department
Massachusetts Institute of Technology. Department of Physics; Massachusetts Institute of Technology. Laboratory for Nuclear Science
Journal
Physical Review D
Publisher
American Physical Society (APS)
Citation
Aaltonen, T., et al. “First Simultaneous Measurement of the Top Quark Mass in the Lepton + Jets and Dilepton Channels at CDF.” Physical Review D, vol. 79, no. 9, May 2009. © 2009 The American Physical Society
Version: Final published version
ISSN
1550-7998
1550-2368

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