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Measurement of the top quark mass in the lepton plus jets channel using the ideogram method
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2007 (English)In: Physical Review D, ISSN 1550-7998, Vol. 75, no 9, 092001-1-092001-21 p.Article in journal (Refereed) Published
Abstract [en]

A measurement of the top quark mass using events with one charged lepton, missing transverse energy, and jets in the final state, collected by the D0 detector from p (p) over bar collisions at root s=1.96 TeV at the Fermilab Tevatron collider, is presented. A constrained fit is used to fully reconstruct the kinematics of the events. For every event a top quark mass likelihood is calculated taking into account all possible jet assignments and the probability that an event is signal or background. Lifetime-based identification of b jets is employed to enhance the separation between t (t) over bar signal and background from other physics processes and to improve the assignment of the observed jets to the quarks in the t (1) over bar hypothesis. We extract a multiplicative jet energy scale (JES) factor in situ, greatly reducing the systematic effect related to the jet energy measurement. In a data sample with an integrated luminosity of 425 pb(-1), we observe 230 candidate events, with an estimated background of 123 events, and measure m(t)=173.7 +/- 4.4(stat+JES)(-2.0)(+2.1)(syst) GeV. This result represents the first application of the ideogram technique to the measurement of the top quark mass in lepton+jets events.

Place, publisher, year, edition, pages
2007. Vol. 75, no 9, 092001-1-092001-21 p.
Keyword [en]
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Subatomic Physics
URN: urn:nbn:se:kth:diva-35509DOI: 10.1103/PhysRevD.75.092001ISI: 000246891300006ScopusID: 2-s2.0-34347369825OAI: diva2:428907
QC 20110701Available from: 2011-07-01 Created: 2011-07-01 Last updated: 2012-02-02Bibliographically approved

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Clément, ChristopheGollub, NilsHansson, PerStrandberg, Jonas
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Particle and Astroparticle Physics
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