2009/01/31 by The CDF Collaboration, T. Aaltonen, T. Akimoto +98 · 1 citation
Physics and Astronomy · #Algorithm #Astrophysics #Computer science #Event (particle physics) #Fermilab #High-Energy Particle Collisions Research #Luminosity #Muon #Neutrino #Neutrino Physics Research #Nuclear physics #Particle physics #Particle physics theoretical and experimental studies #Physics #Quark #Tevatron #Top quark #hep-ex
paper · pdf · doi:10.1103/physrevd.79.072005
published as Phys.Rev.D79:072005,2009 · Submitted to Phys. Rev. D
arxiv created 2009/03/29 · openalex publication_date 2009/04/16 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/06
We present a measurement of the top quark mass with tt dilepton events produced in pp 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^\ensuremath-1, are selected as tt candidates. To account for the unconstrained event kinematics, we scan over the phase space of the azimuthal angles (\ensuremathφ_\ensuremathν1,\ensuremathφ_\ensuremathν2) of neutrinos and reconstruct the top quark mass for each \ensuremathφ_\ensuremathν1, \ensuremathφ_\ensuremathν2 pair by minimizing a \ensuremathχ2 function in the tt dilepton hypothesis. We assign \ensuremathχ2-dependent weights to the solutions in order to build a preferred mass for each event. Preferred mass distributions (templates) are built from simulated tt 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_\ensuremath-3.3+3.4(stat)\ifmmode±\else\textpm\fi3.1(syst) GeV/c2.