We present a measurement of the mass of the top quark using data corresponding to an integrated luminosity of 1.9 fb(-1) of p (p) over bar collisions collected at root s = 1.96 TeV 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(top)=(171.9 +/- 1.7(stat + JES) +/- 1.1(other syst)) GeV/c(2)=(171.9 +/- 2.0) GeV/c(2).
|Titolo:||First simultaneous measurement of the top quark mass in the lepton+jets and dilepton channels at CDF|
|Rivista:||PHYSICAL REVIEW. D. PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY|
|Citazione:||T., A., J., A., T., A., M., A., B., G., S., A., et al. (2009). First simultaneous measurement of the top quark mass in the lepton+jets and dilepton channels at CDF. PHYSICAL REVIEW. D. PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY, 79(9), 092005-1-092005-23.|
|Appare nelle tipologie:||1.1 Articolo in rivista|
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