Measurement of the t
t production cross section in p
p collisions using dilepton events

GUSTAVO OTERO Y GARZON, THE DZERO COLLABORATION

PHYSICAL REVIEW D - PARTICLE AND FILDS

Año: 2007 p. 520061 - 5200610

0556-2821

We present a measurement of the tt
pair production cross section in pp
collisions at

ps
1:96 TeVutilizing approximately 425 pb1 of data collected with the D0 detector. We consider decay channelscontaining two high pT charged leptons (either e or
) from leptonic decays of both top-daughter Wbosons. These were gathered using four sets of selection criteria, three of which required that a pair offully identified leptons (i.e., e
, ee, or

) be found. The fourth approach imposed less restrictive criteriaon one of the lepton candidates and required that at least one hadronic jet in each event be tagged ascontaining a b quark. For a top quark mass of 175 GeV, the measured cross section is 7:4  1:4stat  1:0syst pb and for the current Tevatron average top quark mass of 170.9 GeV, the resulting value of thecross section is 7:8  1:8stat  syst pb.