Measurement of the Top Quark Mass in the Lepton + Jets Channel using the Ideogram Method
(2007) Physical review D — Vol. 75 (2007)
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- Abstract
- 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-pbar collisions at sqrt{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-tbar signal and background from other physics processes and to improve the assignment of the observed jets to the quarks in the t-tbar hypothesis. We extract a multiplicative jet energy scale factor JES 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) +2.1/-2.0 (syst) GeV. This result represents the first application of the Ideogram technique to the measurement of the top quark mass in lepton+jets events.
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Tanasijczuk, A. J., D0, & et al. (2007). Measurement of the Top Quark Mass in the Lepton + Jets Channel using the Ideogram Method. Physical review D, 75. https://doi.org/10.1103/PhysRevD.75.092001 (Original work published 2007)