corner
corner

Phys. Rev. Lett. 99, 182002 (2007) [7 pages]

Precise Measurement of the Top-Quark Mass in the Lepton+Jets Topology at CDF II

Download: PDF (228 kB) Buy this article Export: BibTeX or EndNote (RIS)

T. Aaltonen et al. CDF Collaboration
Show All Authors/Affiliations

Received 29 March 2007; published 31 October 2007

We present a measurement of the mass of the top quark from proton-antiproton collisions recorded at the CDF experiment in Run II of the Fermilab Tevatron. We analyze events from the single lepton plus jets final state (tt̅ →W+bW-b̅ →lνbqq̅ b̅ ). The top-quark mass is extracted using a direct calculation of the probability density that each event corresponds to the tt̅ final state. The probability is a function of both the mass of the top quark and the energy scale of the calorimeter jets, which is constrained in situ by the hadronic W boson mass. Using 167 events observed in 955  pb-1 of integrated luminosity, we achieve the single most precise measurement of the top-quark mass, 170.8±2.2(stat.)±1.4(syst.)  GeV/c2.

© 2007 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.99.182002
DOI:
10.1103/PhysRevLett.99.182002
PACS:
14.65.Ha, 12.15.Ff, 13.85.Qk