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Measurement of the top quark mass in the lepton+jets channel using the ideogram method
Uppsala University.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics, High Energy Physics.
Uppsala University.
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2007 (English)In: Physical Review D. Particles and fields, ISSN 0556-2821, E-ISSN 1089-4918, Vol. 75, no 9, 092001- 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- p.
National Category
Physical Sciences
URN: urn:nbn:se:uu:diva-148113DOI: 10.1103/PhysRevD.75.092001ISI: 000246891300006OAI: oai:DiVA.org:uu-148113DiVA: diva2:401298
D0 Collaboration, for complete list of authors see articleAvailable from: 2011-03-02 Created: 2011-03-02 Last updated: 2011-03-02Bibliographically approved

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