Observation of the Top Quark

Journal Article · Mon Apr 03 00:00:00 EDT 1995 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.74.2632· OSTI ID:46383

Abachi, S; Abbott, B; Abolins, M; Acharya, B S; Adam, I; Adams, D L; Adams, M; Ahn, S; Aihara, H; Aihara, H; Alitti, J; Alvarez, G; Alves, G A; Amidi, E; Amos, N; Anderson, E W; Aronson, S H; Astur, R; Avery, R E; Balamurali, V ; Balderston, J; Baldin, B; Bantly, J; Bartlett, J F; Bazizi, K; Bendich, J; Beri, S B; Bertram, I; Bezzubov, V A; Bhat, P C; Bhatnagar, V; Bhattacharjee, M; Bischoff, A; Biswas, N; Blazey, G; Blessing, S; Boehnlein, A; Bojko, N I; Borcherding, F; Borders, J; Boswell, C; Brandt, A; Brock, R; Bross, A; Buchholz, D; Burtovoi, V S; Butler, J M; Casey, D; Castilla-Valdez, H; Chakraborty, D; Chang, S; Chekulaev, S V; Chen, L; Chen, W; Chevalier, L; Chopra, S; Choudhary, B C; Christenson, J H; Chung, M; Claes, D; Clark, A R; Cobau, W G; Cochran, J; Cooper, W E; Cretsinger, C; Cullen-Vidal, D; Cummings, M; Cutts, D; Dahl, O I; De, K; Demarteau, M; Demina, R; Denisenko, K; Denisenko, N; Denisov, D; Denisov, S P; Dharmaratna, W; Diehl, H T; Diesburg, M; Di Loreto, G; Dixon, R; Draper, P; Drinkard, J; Ducros, Y; Dugad, S R; Durston-Johnson, S; Edmunds, D; Efimov, A O; Ellison, J; Elvira, V D; Engelmann, R; Eno, S; Eppley, G; Ermolov, P; Eroshin, O V; Evdokimov, V N; Fahey, S; Fahland, T; Fatyga, M; Fatyga, M K; Featherly, J; Feher, S; Fein, D; Ferbel, T; Finocchiaro, G; Fisk, H E; Fisyak, Y; Flattum, E; Forden, G E; Fortner, M; Frame, K C; Franzini, P; Fredriksen, S; Fuess, S; Galjaev, A N; Gallas, E; Gao, C S; Gao, S; Geld, T L; Genik, II, R J; Genser, K; Gerber, C E; Gibbard, B; Glaubman, M; Glebov, V; Glenn, S; Glicenstein, J F; Gobbi, B; Goforth, M; Goldschmidt, A; Gomez, B; Goncharov, P I; Gordon, H; Goss, L T; Graf, N; Grannis, P D; Green, D R; Green, J; Greenlee, H; Griffin, G; Grossman, N; Grudberg, P; Gruenendahl, S; Guida, J A; Guida, J M; Guryn, W; Gurzhiev, S N; Gutnikov, Y E

The D0 Collaboration reports on a search for the standard model top quark in {ital p{bar p}} collisions at {radical}{ital s}=1.8TeV at the Fermilab Tevatron with an integrated luminosity of approximately 50pb{sup {minus}1}. We have searched for {ital t{bar t}} production in the dilepton and single-lepton decay channels with and without tagging of {ital b}-quark jets. We observed 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 measured its mass to be 199{sub {minus}21}{sup +19} (stat) {plus_minus}22 (syst) GeV/{ital c}{sup 2} and its production cross section to be 6.4{plus_minus}2.2pb.

• OSTI ID: 46383
• Journal Information: Physical Review Letters, Vol. 74, Issue 14; Other Information: PBD: 3 Apr 1995
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
PROTON-ANTIPROTON INTERACTIONS
PARTICLE IDENTIFICATION
TOP PARTICLES
STANDARD MODEL
QUARKS
TEV RANGE
FERMILAB TEVATRON
LUMINOSITY
TOPONIUM
PARTICLE PRODUCTION
LEPTONS
BEAUTY PARTICLES
JETS
FLUCTUATIONS
SIGNALS
MASS
CROSS SECTIONS