Precision Top-Quark Mass Measurement in the Lepton+ Jets Topology in pp [over¯] Collisions at sqrt [s]= 1.96 TeV (original) (raw)
Related papers
Precision Top-Quark Mass Measurement in the Lepton+Jets Topology in pp¯ Collisions at s=1.96 TeV
Physical Review Letters, 2006
We report two measurements of the top-quark mass M top using the CDF II detector at the Fermilab Tevatron in a 318 pb ÿ1 data sample of t t events in the lepton jets final state. One method uses an eventbased likelihood technique resulting in M top 173:2 2:6 ÿ2:4 stat 3:2syst GeV=c 2 or 173:2 4:1 ÿ4:0 GeV=c 2 . The second method reconstructs a top-quark mass in each event using the measured invariant mass of the hadronically decaying W boson to constrain the jet energy scale to obtain a value for M top of The top quark is the heaviest known elementary particle with a mass approximately 40 times that of the nextheaviest quark or lepton. Because of this comparatively large mass, top-quark studies provide insight into our understanding of mass in general, and test theories that explain the large range of quark and lepton masses. Within the context of the standard model of particle physics, the top-quark mass is related to the masses of the W boson and the Higgs boson, the latter object being the key to our understanding of the origin of mass . Precision measurements of the top-quark and W boson masses test the consistency of the standard model, and in particular the PRL 96, Higgs mechanism. A precision measurement of the topquark mass is therefore a main goal of the experiments at the Fermilab Tevatron collider.
2006
We report two measurements of the top-quark mass M top using the CDF II detector at the Fermilab Tevatron in a 318 pb ÿ1 data sample of t t events in the lepton jets final state. One method uses an eventbased likelihood technique resulting in M top 173:2 2:6 ÿ2:4 stat 3:2syst GeV=c 2 or 173:2 4:1 ÿ4:0 GeV=c 2 . The second method reconstructs a top-quark mass in each event using the measured invariant mass of the hadronically decaying W boson to constrain the jet energy scale to obtain a value for M top of The top quark is the heaviest known elementary particle with a mass approximately 40 times that of the nextheaviest quark or lepton. Because of this comparatively large mass, top-quark studies provide insight into our understanding of mass in general, and test theories that explain the large range of quark and lepton masses. Within the context of the standard model of particle physics, the top-quark mass is related to the masses of the W boson and the Higgs boson, the latter object being the key to our understanding of the origin of mass . Precision measurements of the top-quark and W boson masses test the consistency of the standard model, and in particular the PRL 96, Higgs mechanism. A precision measurement of the topquark mass is therefore a main goal of the experiments at the Fermilab Tevatron collider.
Precision measurement of the top quark mass in lepton + jets final States
Physical review letters, 2014
We measure the mass of the top quark in lepton+jets final states using the full sample of pp collision data collected by the D0 experiment in Run II of the Fermilab Tevatron Collider at sqrt[s] = 1.96 TeV, corresponding to 9.7 fb(-1) of integrated luminosity. We use a matrix element technique that calculates the probabilities for each event to result from tt production or background. The overall jet energy scale is constrained in situ by the mass of the W boson. We measure m(t) = 174.98 ± 0.76 GeV. This constitutes the most precise single measurement of the top-quark mass.
Precise measurement of the top-quark mass from lepton+jets events at D0
Physical Review D, 2011
We report a measurement of the mass of the top quark in lepton+jets final states of pp →tt data corresponding to 2.6 fb −1 of integrated luminosity collected by the D0 experiment at the Fermilab Tevatron Collider. A matrix-element method is developed that combines an in situ jet energy calibration with our standard jet energy scale derived from studies of γ+jet and dijet events. We then implement a flavor-dependent jet response correction through a novel approach. This method is used to measure a top-quark mass of mt = 176.01 ± 1.64 GeV. Combining this result with our previous result obtained on an independent data set, we measure a top-quark mass of mt = 174.94 ± 1.49 GeV for a total integrated luminosity of 3.6 fb −1 .
Top-Quark Mass Measurement Using Events with Missing Transverse Energy and Jets at CDF
Physical Review Letters, 2011
We present a measurement of the top-quark mass using a sample of tbartt\bar{t}tbart events in 5.7 fb$^{-1}$ of integrated luminosity from pbarpp\bar{p}pbarp collisions at the Fermilab Tevatron with sqrts=\sqrt{s} =sqrts= 1.96 TeV and collected by the CDF II Detector. We select events having no identified charged leptons, large missing transverse energy, and four, five, or six jets with at least one jet tagged as coming from a bbb quark. This analysis considers events from the semileptonic \ttbar decay channel, including events that contain tau leptons. The measurement is based on a multidimensional template method. We fit the data to signal templates of varying top-quark masses and background templates, and measure a top-quark mass of mtop=gevccmeasStatSyst172.32.41.0\mtop = \gevcc{\measStatSyst{172.3}{2.4}{1.0}}mtop=gevccmeasStatSyst172.32.41.0.