We report a measurement of the top-quark mass using events collected by the CDF II detector from pp̄ collisions at s=1.96TeV at the Fermilab Tevatron. We calculate a likelihood function for the top-quark mass in events that are consistent with tt ̄ → b̄ - ν̄ b ′+ν ′ 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 340pb-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 tt ̄ →b +ν b ̄ ′-ν̄ ′ 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. © 2006 The American Physical Society.
Top-quark mass measurement from dilepton events at CDF II
Piacentino G.;
2006-01-01
Abstract
We report a measurement of the top-quark mass using events collected by the CDF II detector from pp̄ collisions at s=1.96TeV at the Fermilab Tevatron. We calculate a likelihood function for the top-quark mass in events that are consistent with tt ̄ → b̄ - ν̄ b ′+ν ′ 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 340pb-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 tt ̄ →b +ν b ̄ ′-ν̄ ′ 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. © 2006 The American Physical Society.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.