Lancaster, M; Waters, DCDFC; (2006) Top-Quark Mass Measurement from Dilepton Events at CDF II. Physical Review Letters , 96 (15) , Article 152002. 10.1103/PhysRevLett.96.152002.

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Abstract

We report a measurement of the top-quark mass using events collected by the CDF II detector from pp̅ collisions at √s=1.96  TeV at the Fermilab Tevatron. We calculate a likelihood function for the top-quark mass in events that are consistent with tt̅ →b̅ ℓ-ν̅ ℓbℓ′+νℓ′ decays. The likelihood is formed as the convolution of the leading-order matrix element and detector resolution functions. The joint likelihood is the product of likelihoods for each of 33 events collected in 340  pb-1 of integrated luminosity, yielding a top-quark mass Mt=165.2±6.1(stat)±3.4(syst)  GeV/c2. This first application of a matrix-element technique to tt̅ →bℓ+νℓb̅ ℓ′-ν̅ ℓ′ decays gives the most precise single measurement of Mt in dilepton events. Combined with other CDF run II measurements using dilepton events, we measure Mt=167.9±5.2(stat)±3.7(syst)  GeV/c2.

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