Observation of the top quark

The DO collaboration reports on a search for the Standard Model top quark in pbar-p collisions at Sqrt(s)=1.8TeV at the Fermilab Tevatron, with an integrated luminosity of approximately 50pb-1. We have searched for t-tbar production in the dilepton and single-lepton decay channels, with and without tagging of b-quark jets. We observed 17 events with an expected background of 3.8+/-0.6 events. The probability for an upward fluctuation of the background to produce the observed signal is 2.0E-6 (equivalent to 4.6 standard deviations). The kinematic properties of the excess events are consistent with top quark decay. We conclude that we have observed the top quark and measure its mass to be 199~+19_21 (stat.)+/- 22 (syst.)GeV/c**2 and its production cross section to be 6.4 +/- 2.2 pb.

Note:

also available at http://fnnews.fnal.gov/top_paper_dzero.ps, see also http://fnnews.fnal.gov/top_discovery.html Report-no: Fermilab-Pub-95/028-E •
High Energy and Particle Physics Prize of the EPS 2019

D0
anti-p p: colliding beams
colliding beams: anti-p p
anti-p p: inclusive reaction
top
quark: pair production
pair production: quark
top: decay
decay: quark
final state: ((n)jet 2lepton)

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