• Milestone

Observation of the Top Quark

S. Abachi et al. (D0 Collaboration)
Phys. Rev. Lett. 74, 2632 – Published 3 April 1995
An article within the collection: Letters from the Past - A PRL Retrospective
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Abstract

The D0 Collaboration reports on a search for the standard model top quark in pp¯ collisions at s=1.8TeV at the Fermilab Tevatron with an integrated luminosity of approximately 50pb1. We have searched for tt¯ 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 2×106 (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 measured its mass to be 19921+19 (stat) ±22 (syst) GeV/c2 and its production cross section to be 6.4±2.2pb.

  • Received 24 February 1995

DOI:https://doi.org/10.1103/PhysRevLett.74.2632

©1995 American Physical Society

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This article appears in the following collection:

Letters from the Past - A PRL Retrospective

2008 marked PRL’s 50th anniversary. As part of the celebrations a collection of milestone Letters was started. The collection contains Letters that have made long-lived contributions to physics, either by announcing significant discoveries, or by initiating new areas of research.

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Issue

Vol. 74, Iss. 14 — 3 April 1995

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