Measurement of the Top Quark Mass

Abstract

We present a measurement of the top quark mass using a sample of t-tbar decays into an electron or a muon, a neutrino, and four jets. The data were collected in p-pbar collisions at sqrt(s)=1.8 TeV with the Collider Detector at Fermilab and correspond to an integrated luminosity of 109 pb^-1. We measure the top quark mass to be 175.9 +/- 4.8(stat.) +/- 4.9(syst.) GeV/c^2.

Figures (2)

• Figure 1: Reconstructed-mass distribution of the four mass subsamples combined. The data (points) are compared with the result of the combined fit (dark shading) and with the background component of the fit (light shading). The inset shows the variation of the combined negative log-likelihood with $M_{\rm top}$.
• Figure 2: Reconstructed-mass distributions in each of the four mass subsamples. Each plot shows the data (points), the result of the combined fit to top+background (dark shading), and the background component of the fit (light shading). The insets show the variation of the negative log-likelihoods with $M_{\rm top}$ for the separate subsample fits.