Abstract/Details

Measurement of the top quark mass simultaneously in dilepton and lepton + jets decay channels


2008 2008

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Abstract (summary)

We present the first measurement of the top quark mass using simultaneously data from two decay channels. We use a data sample of s**0.5=1.96 TeV collisions with integrated luminosity of 1.9 fb**-1 collected by the CDF II detector. We select dilepton and lepton + jets channel decays of top-antitop pairs and reconstruct two observables in each topology. We 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. 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 resonance from the lepton + jets channel. Using 144 dilepton candidate events and 332 lepton + jets candidate events we measure: Mtop=171.9 +/- 1.7 (stat. + JES) +/- 1.1 (other syst.) GeV/c**2 = 171.9 +/- 2.0 GeV/c**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. Measurements of the W boson mass and the top quark mass provide a constraint on the mass of the yet unobserved Higgs boson. The Higgs boson mass implied by measurement presented here is higher than Higgs boson mass implied by previously published, most precise CDF measurements of the top quark mass in lepton + jets and dilepton channels separately.

Indexing (details)


Subject
Particle physics
Classification
0798: Particle physics
Identifier / keyword
Pure sciences; Decay channels; Dilepton; Lepton+jets channels; Top quark
Title
Measurement of the top quark mass simultaneously in dilepton and lepton + jets decay channels
Author
Fedorko, Wojciech T.
Number of pages
169
Publication year
2008
Degree date
2008
School code
0330
Source
DAI-B 69/11, Dissertation Abstracts International
Place of publication
Ann Arbor
Country of publication
United States
ISBN
9780549928317
Advisor
Kim, Young-Kee
University/institution
The University of Chicago
University location
United States -- Illinois
Degree
Ph.D.
Source type
Dissertations & Theses
Language
English
Document type
Dissertation/Thesis
Dissertation/thesis number
3338340
ProQuest document ID
304407622
Copyright
Database copyright ProQuest LLC; ProQuest does not claim copyright in the individual underlying works.
Document URL
http://search.proquest.com/docview/304407622
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