Top physics at D0
The D0 collaboration reports on the observation of the Standard Model top quark in p{anti p} collisions at {radical}s = 1.8 TeV at the Fermilab Tevatron. The authors have searched for t{anti t} production with an integrated luminosity of approximately 50 pb{sup {minus}1} in the dilepton and single-lepton decay channels, with and without tagging of b quark jets. They observe 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 {times} 10{sup {minus}6} (equivalent to 4.6 standard deviations). The kinematic properties of the excess events are consistent with top quark decay. They measure the top quark mass to be 199{sub {minus}21}{sup +19} (stat.) {sub {minus}21}{sup +14} (syst.) GeV/c{sup 2} and its production cross section to be 6.4 {+-} 2.2 pb. D0 also sees a hadronic W mass peak (W {yields} jj) in the t{bar t} data events. Preliminary results from multivariate analyses and from the t{bar t} data events. Preliminary results from multivariate analyses and from the t{bar t} {yields} all-jets channel are discussed. Preliminary determination of the top quark mass using dilepton events yields 145 {+-} 25 (stat.) {+-}20 (syst.) GeV/C{sup 2}.
- Research Organization:
- Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States); National Science Foundation, Washington, DC (United States); Ministry of Science and Technology Policy (Russian Federation); Russian Atomic Energy Commission, Moscow (Russian Federation); Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq), Sao Paulo, SP (Brazil); Consejo Nacional de Ciencia y Tecnologia (CONACYT), Mexico City (Mexico); Department of Atomic Energy, Bombay (India). Atomic Minerals Div.; Department of Education (India); Calciencias; Korea Science and Engineering Foundation (Korea, Republic of); Sloan (Alfred P.) Foundation, New York, NY (United States); CEA, 75 - Paris (France)
- DOE Contract Number:
- AC02-76CH03000
- OSTI ID:
- 119990
- Report Number(s):
- FNAL/C-95/303-E; CONF-9508155-16; ON: DE96001737; TRN: 95:024493
- Resource Relation:
- Conference: 17. international symposium on lepton-photon interactions, Beijing (China), 10-15 Aug 1995; Other Information: PBD: Sep 1995
- Country of Publication:
- United States
- Language:
- English
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