First simultaneous measurement of the top quark mass in the lepton + jets and dilepton channels at CDF
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...
Main Authors: | , , , , , , , , |
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Other Authors: | , |
Format: | Article |
Language: | English |
Published: |
American Physical Society (APS),
2018-11-14T18:15:04Z.
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Subjects: | |
Online Access: | Get fulltext |
Summary: | 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]. National Science Foundation (U.S.) United States. Department of Energy |
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