Direct measurement of the top quark mass by the DO/ Collaboration

Journal Article · Tue Sep 01 00:00:00 EDT 1998 · Physical Review, D

OSTI ID:656319

Gomez, B; Hoeneisen, B; Mooney, P; Negret, J P ^[1]; Davis, K; Fein, D; Forden, G E; Guida, J A; James, E; Johns, K; Nang, F; Narayanan, A; Rutherfoord, J ^[2]; Butler, J M ^[3]; Gibbard, B; Gordon, H; Graf, N; Kahn, S; Kotcher, J; Protopopescu, S ; Rajagopalan, S ^[4]; Bantly, J; Cullen-Vidal, D; Cutts, D; Guida, J M; Hoftun, J S; Partridge, R ^[5]; Grinstein, S; Piegaia, R ^[6]; Bloom, P; Fisyak, Y; Glenn, S; Grim, G; Klopfenstein, C; Lander, R; Mani, S ^[7]; Fahland, T; Hall, R E ^[8]; Boswell, C; Choudhary, B C; Cochran, J; Ellison, J; Gartung, P; Gounder, K; Heinson, A P; Huehn, T ^[9]; Alves, G A; Carvalho, W; Maciel, A K; da Motta, H; Oliveira, E; Santoro, A ^[10]; Castilla-Valdez, H; Gonzalez Solis, J L; Hernandez-Montoya, R; Magana-Mendoza, L; Sanchez-Hernandez, A ^[11]; Adam, I; Kotwal, A V ^[12]; Ahn, S; Baldin, B; Bartlett, J F; Bhat, P C; Boehnlein, A; Borcherding, F; Brandt, A; Bross, A; Christenson, J H; Cooper, W E; Demarteau, M; Denisov, D; Diehl, H T; Diesburg, M; Feher, S; Fisk, H E; Flattum, E; Fuess, S; Genser, K; Gerber, C E; Green, D R; Greenlee, H; Grossman, N; Gruenendahl, S; Haggerty, H; Hansen, S; Heintz, U; Hobbs, J D; Ito, A S; Johnson, M; others, and

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1. Universidad de los Andes, Bogota (Colombia)
2. University of Arizona, Tucson, Arizona 85721 (United States)
3. Boston University, Boston, Massachusetts 02215 (United States)
4. Brookhaven National Laboratory, Upton, New York 11973 (United States)
5. Brown University, Providence, Rhode Island 02912 (United States)
6. Universidad de Buenos Aires, Buenos Aires (Argentina)
7. University of California, Davis, California 95616 (United States)
8. University of California, Irvine, California 92697 (United States)
9. University of California, Riverside, California 92521 (United States)
10. LAFEX, Centro Brasileiro de Pesquisas Fisicas, Rio de Janeiro (Brazil)
11. CINVESTAV, Mexico City (Mexico)
12. Columbia University, New York, New York 10027; Delhi University, Delhi, (India) 110007

We determine the top quark mass m{sub t} using t{bar t} pairs produced in the DO/ detector by {radical} (s) =1.8thinspTeV p{bar p} collisions in a 125thinsppb{sup {minus}1} exposure at the Fermilab Tevatron. We make a two constraint fit to m{sub t} in t{bar t}{r_arrow}bW{sup +}{bar b}W{sup {minus}} final states with one {ital W} boson decaying to q{bar q} and the other to e{nu} or {mu}{nu}. Likelihood fits to the data yield m{sub t}(l+jets)=173.3{plus_minus}5.6thinsp(stat)thinsp{plus_minus}thinsp5.5thinsp(s st) GeV/c{sup 2}. When this result is combined with an analysis of events in which both {ital W} bosons decay into leptons, we obtain m{sub t}=172.1{plus_minus}5.2thinsp(stat)thinsp{plus_minus}thinsp4.9thinsp(syst) GeV/c{sup 2}. An alternate analysis, using three constraint fits to fixed top quark masses, gives m{sub t}(l+jets)=176.0{plus_minus}7.9thinsp(stat){plus_minus}thinsp4.8thinsp(syst) GeV/c{sup 2}, consistent with the above result. Studies of kinematic distributions of the top quark candidates are also presented. {copyright} {ital 1998} {ital The American Physical Society}

• OSTI ID: 656319
• Journal Information: Physical Review, D, Vol. 58, Issue 5; Other Information: PBD: Sep 1998
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
T QUARKS
MASS
TRANSVERSE MOMENTUM
LEPTONS
JETS
SIGNALS
PROTON-ANTIPROTON INTERACTIONS
PARTICLE PRODUCTION