Top Quark Mass in Dilepton Channel Using Matrix Element

Summer 2006: 955 pb^-1

B. Jayatilaka¹, D. Whiteson², M. Tecchio¹, D. Gerdes¹, H. H. Williams²

¹ University of Michigan
² University of Pennsylvania

CDF Collaboration

E-mail authors

We present a measurement of the top quark mass in the dilepton channel using a technique in which we form a posterior probability for the mass as a product of the per-event differential cross-section for leading order top quark pair production. The calculation of the differential cross section for processes which produce background events are used to reduce the impact of background events in the sample. We require at least one jet tagged with a displaced secondary vertex in order to increase the purity of the sample.

In 955 pb^-1 of Run II data, we expect a statistical uncertainty of 5.0 GeV if M_top=167.5 GeV/c². We measure

M_top = 167.3 ± 4.6 (stat.) ± 3.8 (syst.) GeV/c²

Documentation

A note describing this analysis can be found here.
Internal page for CDF collaborators

Tables and Plots

Description	jpg	pdf/eps
Final posterior probability density as a function of top pole mass for the 30 dilepton candidate events in data.		pdf/eps
Expected distribution of errors from MC (M_t= GeV/c²) and measured error in data. 39% of pseudo-experiments had an error lower than that measured in data.		pdf/eps
Response for pseudo-experiments of signal and background events.		pdf/eps
Residual, pull mean, and pull width for varying top mass MC samples after scaling of statistical error. The error scaling factor is S=1.49		pdf/eps
Table of systematic errors.		pdf