Measurement of the Top Quark Mass Simultaneously in Dilepton and Lepton + Jets Decay Channels.

Fedorko, W. T.

Technical Information Center Oak Ridge Tennessee

关键词: T Quarks;    Leptons;    Decay;    Fermilab collider detector;    Higgs bosons;   

RP-ID  :  DE2008938899

学科分类：工程和技术（综合）

美国|英语

来源: National Technical Reports Library

【 摘 要 】

The authors present the first measurement of the top quark mass using simultaneously data from two decay channels. They use a data sample of (radical)s = 1.96 TeV collisions with integrated luminosity of 1.9 fb(sup -1) collected by the CDF II detector. They select dilepton and lepton + jets channel decays of t(bar t) pairs and reconstruct two observables in each topology. They use non-parametric techniques to derive probability density functions from simulated signal and background samples. The observables are the reconstructed top quark mass and the scalar sum of transverse energy of the event in the dilepton topology and the reconstructed top quark mass and the invariant mass of jets from the W boson decay in lepton + jets channel. They perform a simultaneous fit for the top quark mass and the jet energy scale which is constrained in situ by the hadronic W boson resonance from the lepton + jets channel. Using 144 dilepton candidate events and 332 lepton + jets candidate events they measure: M(sub top) = 171.9 (+-) 1.7 (stat. + JES) (+-) 1.1 (other sys.) GeV/c(sup 2) = 171.9 (+-) 2.0 GeV/c(sup 2). The measurement features a robust treatment of the systematic uncertainties, correlated between the two channels and develops techniques for a future top quark mass measurement simultaneously in all decay channels.