2009/06/29 by The CDF Collaboration, J. Adelman, T. Aaltonen +98
Physics and Astronomy · #High-Energy Particle Collisions Research #Particle Detector Development and Performance #Particle physics theoretical and experimental studies #hep-ex
paper · pdf · doi:10.1103/physrevd.80.051104
published as Phys.Rev.D80:051104,2009 · submitted to Phys. Rev. D (R)
arxiv created 2009/06/29 · openalex publication_date 2009/09/08 · arxiv updated 2010/05/12 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/04
We present the first measurement of the mass of the top quark in a sample of tt\ensuremath→\ensuremathℓ\ensuremathνbbqq events (where \ensuremathℓ=e,\ensuremathμ) selected by identifying jets containing a muon candidate from the semileptonic decay of heavy-flavor hadrons (soft muon b tagging). The pp collision data used correspond to an integrated luminosity of 2 fb^\ensuremath-1 and were collected by the CDF II detector at the Fermilab Tevatron Collider. The measurement is based on a novel technique exploiting the invariant mass of a subset of the decay particles, specifically the lepton from the W boson of the t\ensuremath→Wb decay and the muon from a semileptonic b decay. We fit template histograms, derived from simulation of tt events and a modeling of the background, to the mass distribution observed in the data and measure a top quark mass of 180.5\ifmmode±\else\textpm\fi12.0(stat)\ifmmode±\else\textpm\fi3.6(syst) GeV/c2, consistent with the current world average value.