Observation of the top quark | Zendy

P. Protopopescu | Zendy

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Observation of the top quark

Author(s) -

P. Protopopescu

Publication year - 1995

Publication title -

osti oai (u.s. department of energy office of scientific and technical information)

Language(s) - English

Resource type - Reports

DOI - 10.2172/105721

Subject(s) - physics , tevatron , top quark , particle physics , fermilab , lepton , standard model (mathematical formulation) , nuclear physics , bottom quark , quark , luminosity , production (economics) , bar (unit) , particle decay , elementary particle , large hadron collider , astrophysics , macroeconomics , archaeology , gauge (firearms) , galaxy , meteorology , economics , history , electron

The DO collaboration reports on a search for the Standard Model top quark in p{bar p} collisions at {radical}s = 1.8 TeV at the Fermilab Tevatron, with an integrated luminosity of approximately 50 pb{sup {minus}1}. We have searched for t{bar t} production in the dilepton and single-lepton decay channels, with and without tagging of b quark jets. We observe 17 events with an expected background of 3.8 {plus_minus} 0.6 events. The probability for an upward fluctuation of the background to produce the observed signal is 2 {times} 10{sup {minus}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{sub {minus}21}{sup +19} (stat.) {plus_minus}22 (syst.) GeV/C{sup 2} and its production cross section to be 6.4 {plus_minus} 2.2 pb

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