Measurement of the top quark mass at CDF using the "neutrino phi weighting" template method on a lepton plus isolated track sample
Author(s)Choudalakis, Georgios; Gomez-Ceballos, Guillelmo; Goncharov, Maxim; Hahn, Kristian Allan; Henderson, C.; Knuteson, Bruce O.; Makhoul, K.; Paus, Christoph M. E.; Xie, Si; Bauer, Gerry P.; ... Show more Show less
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We present a measurement of the top quark mass with tt̅ dilepton events produced in pp̅ collisions at the Fermilab Tevatron (√s=1.96 TeV) and collected by the CDF II detector. A sample of 328 events with a charged electron or muon and an isolated track, corresponding to an integrated luminosity of 2.9 fb[superscript -1], are selected as tt̅ candidates. To account for the unconstrained event kinematics, we scan over the phase space of the azimuthal angles (ϕ[subscript ν1],ϕ[subscript ν2]) of neutrinos and reconstruct the top quark mass for each ϕ[subscript ν1], ϕ[subscript ν2] pair by minimizing a χ[superscript 2] function in the tt̅ dilepton hypothesis. We assign χ[superscript 2]-dependent weights to the solutions in order to build a preferred mass for each event. Preferred mass distributions (templates) are built from simulated tt̅ and background events, and parametrized in order to provide continuous probability density functions. A likelihood fit to the mass distribution in data as a weighted sum of signal and background probability density functions gives a top quark mass of 165.5[subscript -3.3][superscript +3.4](stat)±3.1(syst) GeV/c[superscript 2].
DepartmentMassachusetts Institute of Technology. Laboratory for Nuclear Science
Physical Review D
American Physical Society
CDF Collaboration et al. “Measurement of the top quark mass at CDF using the "neutrino phi weighting" template method on a lepton plus isolated track sample.” Physical Review D 79.7 (2009): 072005. c2010 American Physical Society.
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