Aaltonen , T , Mehtälä , P , Orava , R , Mäki , T , Saarikko , H , Österberg , K & CDF Collaboration 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 , vol. 79 , no. 9 , pp. 092005 . https://doi.org/10.1103/PhysRevD.79.092005
Title: | First simultaneous measurement of the top quark mass in the lepton+jets and dilepton channels at CDF |
Alternative title: | The first measurement of the top quark mass at CDF II in the lepton+jets and dilepton channels simultaneously |
Author: | Aaltonen, T.; Mehtälä, Petteri; Orava, Risto; Mäki, Tuula; Saarikko, Heimo; Österberg, Kenneth; CDF Collaboration |
Contributor organization: | Helsinki Institute of Physics Department of Physics |
Date: | 2009 |
Language: | eng |
Number of pages: | 23 |
Belongs to series: | Physical Review D : Particles, Fields, Gravitation and Cosmology |
ISSN: | 1550-7998 |
DOI: | https://doi.org/10.1103/PhysRevD.79.092005 |
URI: | http://hdl.handle.net/10138/24410 |
Abstract: | We present a measurement of the mass of the top quark using data corresponding to an integrated luminosity of 1.9fb^-1 of ppbar collisions collected at sqrt{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 non-parametric 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 mtop=171.9 +/- 1.7 (stat. + JES) +/- 1.1 (syst.) GeV/c^2 = 171.9 +/- 2.0 GeV/c^2. We present a measurement of the mass of the top quark using data corresponding to an integrated luminosity of 1.9 fb-1 of pp̅ collisions collected at √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 Mtop=171.9±1.7(stat+JES)±1.1(other syst) GeV/c2=171.9±2.0 GeV/c2. |
Description: | submitted to Phys. Rev. D |
Subject: |
hep-ex
114 Physical sciences |
Peer reviewed: | Yes |
Usage restriction: | restrictedAccess |
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