Jul 16 – 22, 2009
Kraków, Poland
Europe/Warsaw timezone

TOP-MASS MEASUREMENTS FROM DØ

Jul 17, 2009, 9:50 AM
20m
Middle Lecture Hall A (Kraków, Poland)

Middle Lecture Hall A

Kraków, Poland

The Auditorium Maximum of the Jagiellonian University 33 Krupnicza Street 31-123 Kraków
Standard Model Electroweak Physics VII. Standard Model Electroweak Physics

Speaker

Prof. Thomas ferbel (Universities of Rochester/Maryland)

Description

We present three analyses of the mass of the top quark (mt) using top-antitop candidate events collected by the DO experiment during the current run of the Fermilab Tevatron Collider: (i) a 3.6 events/fb sample of data in the lepton+jets channel analyzed to extract a precision value of mt using the “Matrix-Element” method (ME), wherein each event probability is calculated from the differential production cross section as a function of mt and the overall jet energy scale, with the latter partly constrained by the two jets from W decay into q’q, (ii) first measurement of the mass difference between top and antitop quarks as a check of CPT invariance in the quark sector, also utilizing the ME method in lepton+jets channels, corresponding to a 1event/fb data sample, and (iii) measurements of mt in dilepton final states (updated to 3.6 events/fb), based on “matrix” weighting, “neutrino” weighting and the ME method, relying, respectively, on the likelihood of observing the events in data for a range of assumed mt values, distributions generated from event weights used to compare the calculated and reconstructed missing transverse energies, and event probabilities based on the leading-oder differential cross section as a function of assumed mt.

Primary author

Prof. Thomas ferbel (Universities of Rochester/Maryland)

Presentation materials