Measurement of the top quark mass at CDF using the "neutrino phi weighting" template method on a lepton plus isolated track sample

• Main Authors: Xie, Si (Contributor), Makhoul, K. (Contributor), Knuteson, Bruce O. (Contributor), Henderson, C. (Contributor), Hahn, Kristian Allan (Contributor), Goncharov, M. (Contributor), Gomez-Ceballos, Guillelmo (Contributor), Choudalakis, Georgios (Contributor), Bauer, Gerry P. (Contributor), Paus, Christoph M. E. (Contributor)
• Other Authors: Massachusetts Institute of Technology. Department of Physics (Contributor), Massachusetts Institute of Technology. Laboratory for Nuclear Science (Contributor)
• Format: Article
• Language: English
• Published: American Physical Society, 2010-03-04T21:21:44Z.
• Subjects: Article
• Online Access: Get fulltext

 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[subcript ν1],ϕ[subcript ν2]) of neutrinos and reconstruct the top quark mass for each ϕ[subcript ν1], ϕ[subcript 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[subcript -3.3][superscript +3.4](stat)±3.1(syst)  GeV/c[superscript 2].