Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
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TY - JOUR
T1 - Measurement of the top quark mass in the lepton + jets channel using the ideogram method.
AU - Abazov, V. M.
AU - Bertram, Iain
AU - Borissov, Guennadi
AU - Fox, Harald
AU - Ratoff, Peter
AU - Sopczak, Andre
PY - 2007/5/11
Y1 - 2007/5/11
N2 - 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[overline p] 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[overline t] signal and background from other physics processes and to improve the assignment of the observed jets to the quarks in the t[overline t] 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 mt=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.
AB - 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[overline p] 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[overline t] signal and background from other physics processes and to improve the assignment of the observed jets to the quarks in the t[overline t] 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 mt=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.
U2 - 10.1103/PhysRevD.75.092001
DO - 10.1103/PhysRevD.75.092001
M3 - Journal article
VL - 75
SP - 092001
JO - Physical Review D
JF - Physical Review D
SN - 1550-7998
ER -