Abstract
We measure the top quark mass in dilepton final states of tt¯ events in pp¯ collisions at s=1.96 TeV, using data corresponding to an integrated luminosity of 9.7 fb−1 at the Fermilab Tevatron Collider. The analysis features a comprehensive optimization of the neutrino weighting method to minimize the statistical uncertainties. We also improve the calibration of jet energies using the calibration determined in tt¯→lepton+jets events, which reduces the otherwise limiting systematic uncertainty from the jet energy scale. The measured top quark mass is mt=173.32±1.36(stat)±0.85(syst) GeV.
Highlights
The discovery of the top quark in 1995 [1,2] completed the three quark families of the standard model (SM)
Its Yukawa coupling to the Higgs boson, Yt = 2mt /v, where v is the vacuum expectation value of the Higgs field, is close to unity, implying that the top quark may play a special role in electroweak symmetry breaking
The D0 detector [22,23] has a central-tracking system, consisting of a silicon microstrip tracker and a central fiber tracker, both located within a 1.9 T superconducting solenoidal magnet, with designs optimized for identification of the p pcollision vertex and track reconstruction at pseudorapidities [24] of |η| < 3 and |η| < 2.5, respectively
Summary
The discovery of the top quark in 1995 [1,2] completed the three quark families of the standard model (SM). Two high-pT jets must be observed, one of which must be identified as being consistent with originating from a b quark This analysis is based on our previous dilepton measurement [14], but with increased integrated luminosity and multiple optimizations to improve the precision of mt. The most recent measurements of mt in the dilepton channel from CDF, ATLAS, and CMS are, respectively, mt = 171.5 ± 1.9(stat) ± 2.5(syst) GeV [19], mt = 173.79 ± 0.54(stat) ± 1.30(syst) GeV [20], and mt = 172.50 ± 0.43(stat) ± 1.46(syst) GeV [21] In this analysis, we substantially reduce the otherwise dominant uncertainty in the jet energy scale by applying the methods of Ref. We substantially reduce the otherwise dominant uncertainty in the jet energy scale by applying the methods of Ref. [14]
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
