Top quark search with the D0 1992–1993 data sample

Abachi, S.; Abbott, B.; Abolins, M.; Acharya, B. S.; Адам, И.; Adams, T.; Adams, M. R.; Ahn, Shihyun; Aihara, H.; Alitti, J.; Álvarez, G.; Alves, G. A.; Amidi, E.; Amos, N.; Anderson, E. W.; Aronson, S. H.; Astur, R.; Avery, R. E.; Baden, A.; 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. N.; Blazey, G.; Blessing, S.; Bloom, P. C.; Boehnlein, A.; Bojko, N. I.; Borcherding, F.; Borders, J.; Boswell, C.; Brandt, A.; Brock, R.; Bross, A.; Buchholz, D.; Буртовой, В. С.; Butler, J. M.; Casey, D.; Castilla‐Valdez, H.; Chakraborty, D.; Chang, S. M.; Chekulaev, S. V.; Chen, L.-P.; Chen, W.; Chevalier, L.; Chopra, S.; Choudhary, B. C.; Christenson, J. H.; Chung, M.; Claes, D. R.; Clark, A. R.; Cobau, W. G.; Cochran, J.; Cooper, W. E.; Cretsinger, C.; Cullen-Vidal, D.; Cummings, M. A.C.; Ćutts, D.; Dahl, O. I.; De, K.; Demarteau, M.; Démina, R.; Denisenko, K.; Denisenko, N.; Denisov, D.; Denisov, S. P.; Dharmaratna, W. G. D.; Diehl, H. T.; Diesburg, M.; Loreto, G. Di; Dixon, R.; Draper, P.; Drinkard, J.; Ducros, Y.; Dugad, S.; Durston-Johnson, S.; Edmunds, D.; Ellison, J.; Elvira, V. D.; Engelmann, R.; Eno, S. C.; Eppley, G.; Ermolov, P.; Eroshin, O. V.; Evdokimov, V. N.; Fahey, S.; Fahland, T.; Fatyga, M.; Featherly, J.; Fehér, S.; Fein, D.; Ferbel, T.; Finocchiaro, G.; Fisk, H. E.; Fisyak, Y.; Flattum, E.; Forden, G. E.; Fortner, M.; Frame, K. C.; Franzini, P.; Fuess, S.; Galjaev, A. N.; Gallas, E. J.; Gao, Christina; Gao, Song; Geld, T. L.; Genik, R. J.; Genser, K.; Gerber, C. E.; Gibbard, B.; Glaubman, M.; Glebov, V. Yu.; Glenn, S.; Gobbi, B.; Goforth, M.; Goldschmidt, A.; Gómez, B.; Goncharov, P. I.; Gordon, H. A.; Goss, L. T.; Graf, N.; Grannis, P. D.; Green, D. R.; Green, J.; Greenlee, H.; Griffin, G.; Grossman, N.; Grudberg, P.; Grünendahl, S.; Gu, W. X.; Guida, J. A.; Guida, J. M.; Guryn, W.; Gurzhiev, S. N.; Gutnikov, Y. E.; Hadley, N. J.; Haggerty, H.; Hagopian, S.; Hagopian, V.; Hahn, K. S.; Hall, R. E.; Hansen, S.; Hatcher, R.; Hauptman, J. M.; Hedin, D.; Heinson, A. P.; Heintz, U.; Hernández-Montoya, R.; Heuring, T.; Hirosky, R.; Hobbs, J.; Hoeneisen, B.; Hoftun, J. S.; Hsieh, F.; Hu, Ting; Hu, T.; Huehn, T.; Igarashi, S.; Ito, A. S.; James, E.; Jaques, J.; Jerger, S. A.; Jiang, Jun; Joffe–Minor, T.; Johari, H.; Johns, K. A.; Johnson, M.; Johnstad, H.; Jonckheere, A.; Jones, M.; Jöstlein, H.; Jun, S. Y.; Jung, C. K.; Kahn, S.; Kang, J. S.; Kehoe, R.; Kelly, M.; Kernan, A.; Kerth, L. T.; Kim, C. L.; Kim, S. K.; Klatchko, A.; Klima, B.; Klochkov, B. I.; Klopfenstein, C.; Klyukhin, V.; Kochetkov, V.; Kohli, J. M.; Koltick, D.; Kostritskiy, A. V.; Kotcher, J.; Kourlas, J.; Kozelov, A. V.; Kozlovski, E. A.; Krishnaswamy, M. R.; Krzywdziński, S.; Kunori, S.; Lami, S.; Landsberg, G.; Lanou, R.E.; Lebrat, J. F.; Leflat, A.; Li, H.; Li, J.; Li, Y. K.; Li-Demarteau, Q. Z.; Lima, J. G.R.; Lincoln, D.; Linn, S.; Linnemann, J.; Lipton, R.; Liu, Y. C.; Lobkowicz, F.; Loken, S.; Lökòs, S.; Lueking, L.; Lyon, A. L.; Maciel, A. K.A.; Madaras, R. J.; Madden, R.; Mandrichenko, I. V.; Mangeot, Ph.; Mani, S.; Mansoulié, B.; Mao, H. S.; Margulies, S.; Markeloff, R.; Markosky, L. A.; Marshall, T.; Martin, M.; Marx, M.; May, B.; Mayorov, A. A.; McCarthy, R. L.; McKibben, T.; McKinley, J.; Melanson, H. L.; Neto, J. R. T. de Mello; Merritt, K. W.; Miettinen, H.; Milder, A.; Mincer, A. I.; Miranda, J. M. De; Mishra, C. S.; Mohammadi-Baarmand, M.; Mokhov, N.; Mondal, N. K.; Montgomery, H. E.; Mooney, P.; Mudan, M.; Murphy, C.T.; Nang, F.; Narain, M.; Narasimham, V. S.; Narayanan, A.; Neal, H. A.; Negret, J. P.; Neis, E.; Némethy, P.; Nešić, D.; Norman, D.; Oesch, L.; Oguri, V.; Oltman, E.; Oshima, N.; Owen, D.; Padley, P.; Pang, M.; Para, A.; Park, C. H.; Park, Y. M.; Partridge, R.; Parua, N.; Paterno, M.; Perkins, J.; Peryshkin, A.; Peters, Michael; Piekarz, H.; Pischalnikov, Y.; Pluquet, A.; Podstavkov, V. M.; Pope, B. G.; Prosper, H.; Protopopescu, S.; Pušeljić, D. L.; Qian, J.; Quintas, P. Z.; Raja, R.; Rajagopalan, S.; Ramírez, O.; Rao, M. V. S.; Rapidis, P. A.; Rasmussen, L.; Read, A. L.; Reucroft, S.; Rijssenbeek, M.; Rockwell, T.; Roe, N. A.; Rubinov, P.; Ruchti, R.; Rusin, S.; Rutherfoord, J. P.; Santoro, A.; Sawyer, L.; Schamberger, R. D.; Schellman, H.; Sculli, J.; Shabalina, E.; Shaffer, C.; Shankar, H. C.; Shivpuri, R. K.; Shupe, M. A.; Singh, J. B.; Sirotenko, V.; Smart, W.; Smith, A.; Smith, R. P.; Snihur, R.; Snow, G. R.; Snyder, S.; Solomon, J.; Sood, P. M.; Sosebee, M.; Souza, M.; Spadafora, A. L.; Stephens, R. W.; Stevenson, M. L.; Stewart, David J.; Stoianova, D. A.; Stoker, D. P.; Streets, K.; Strovink, M.; Taketani, A.; Tamburello, P.; Tarazi, J.; Tartaglia, M.; Taylor, T. L.; Teiger, J.; Thompson, J.; Trippe, T. G.; Tuts, P. M.; Varelas, N.; Varnes, E. W.; Virador, P.R.G.; Vititoe, D.; Volkov, A.; Vorobiev, A. P.; Wahl, H. D.; Wang, J.; Wang, L. Z.; Warchol, J.; Wayne, M.; Weerts, H.; Wenzel, W. A.; White, A. S.; White, J. T.; Wightman, J. A.; Wilcox, J.; Willis, S.; Wimpenny, S.; Wirjawan, J. V.D.; Womersley, J.; Won, E.; Wood, D.; Xu, H.; Yamada, R.; Yamin, P.; Yanagisawa, C.; Yang, J.; Yasuda, T.; Yoshikawa, C.; Youssef, S.; Yu, J.; Yu, Y.; Zhang, Y.; Zhou, Y.; Zhu, Q. M.; Zhu, Y. S.; Zhu, Z. H.; Ziemińska, D.; Ziemiński, A.; Zylberstejn, A.

doi:10.1103/physrevd.52.4877

Cited by 81 publications

(39 citation statements)

References 55 publications

Supporting

Mentioning

Contrasting

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“…This is based on the observation that the number of W + jets events falls off exponentially with the number of jets. 52,80 Thus, after subtracting the contribution from QCD multijets background, DØ extrapolates from the number of ℓ + jets events observed at low multiplicities to estimate the number of W + jets events with at least four jets. The efficiency for these W + jets events to pass the (A, H T ) requirement is estimated using vecbos.…”

Section: Lepton+jets Channelsmentioning

confidence: 99%

“…The power of such variables to discriminate signal from background was recognized early on, 63 and was first applied to good effect by DØ. 52,76 With this final cut, the sample is reduced to eight events with an estimated background of 1.3±0.3 events. The CDF collaboration then estimates the top quark mass using two different methods.…”

Section: Dilepton Channelsmentioning

confidence: 99%

See 1 more Smart Citation

Top Quark Physics at the Tevatron

Bhat

Prosper

Snyder

1998

Int. J. Mod. Phys. A

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The discovery of the top quark in 1995, by the CDF and DØ collaborations at the Fermilab Tevatron, marked the dawn of a new era in particle physics. Since then, enormous efforts have been made to study the properties of this remarkable particle, especially its mass and production cross section. In this article, we review the status of top quark physics as studied by the two collaborations using the pp collider data at √ s = 1.8 TeV. The combined measurement of the top quark mass, m t = 173.8±5.0 GeV/c 2 , makes it known to a fractional precision better than any other quark mass. The production cross sections are measured as σ tt = 7.6 +1.8 −1.5 pb by CDF and σ tt = 5.5± 1.8 pb by DØ. Further investigations of tt decays and future prospects are briefly discussed.

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Section: Lepton+jets Channelsmentioning

confidence: 99%

Section: Dilepton Channelsmentioning

confidence: 99%

Top Quark Physics at the Tevatron

Bhat

Prosper

Snyder

1998

Int. J. Mod. Phys. A

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“…A detailed description of these cuts can be found in Refs. [2,4]. In the single-lepton plus jets channels, cuts on aplanarity, A, and E W T are used to help remove backgrounds, where E W T is dened as the scalar sum of the E T of the lepton and E / T .…”

Section: Top Cross Sectionmentioning

confidence: 99%

Heavy quark results at D0

Fein¹

1997

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“…There were 2827 events in this initial data sample. Electrons and muons in these events were then required to pass the quality cuts described below.Electrons were required to have transverse and longitudinal shower profiles consistent with expectations based on detailed Monte Carlo studies [10], to have no more than two tracks pointing to the calorimeter cluster, and to have an electromagnetic isolation I < 0.15, where I = [E tot − E EM ]/E EM , E tot is the total cluster energy inside a cone of radius R = 0.4, and E EM is the electromagnetic energy inside a cone of R = 0.2. For electrons with E T between 5 and 10 GeV, the isolation cut was relaxed to I< 0.2 to increase efficiency.…”

mentioning

confidence: 99%

“…Muons were required to have a separation from any jet of at least R = 0.5, to be aligned with minimum ionizing energy deposition in at least 50% of all calorimeter layers and in at least 60% of the hadronic calorimeter layers, and to have either a matching track in the central detectors or impact parameters in the rz (bend) and xy (non-bend) views consistent with the muon having been produced at the primary event vertex [10]. To reduce cosmic ray background, muons were required to be in time with the beam crossing and any muon pair having both polar and azimuthal opening angles greater than 165…”

mentioning

confidence: 99%

Search forW̃1Z̃2Production

Abachi¹,

Abbott²,

Abolins³

et al. 1996

Phys. Rev. Lett.

Self Cite

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We have searched for associated production of the lightest chargino, W 1 , and next-to-lightest neutralino, Z 2 , of the Minimal Supersymmetric Standard Model in pp collisions at √ s = 1.8 TeV using the DØ detector at the Fermilab Tevatron collider. Data corresponding to an integrated luminosity of 12.5±0.7 pb −1 were examined for events containing three isolated leptons. No evidence for W 1 Z 2 pair production was found. Limits on σ( W 1 Z 2 )Br( W 1 → lν Z 1 )Br( Z 2 → ll Z 1 ) are presented. Submitted to the Physical Review LettersTypeset using REVT E X At pp colliders charginos and neutralinos can be produced in pairs, with W 1 Z 2 pairs having the largest cross section over much of the parameter space [6]. Production cross sections O(100-10) pb are possible at the Tevatron for W 1 masses between 45 and 100GeV/c 2 [7,8]. The W 1 can decay into qq ′ or lν plus an LSP, while the Z 2 can decay into qq or ll plus an LSP. The presence of neutrinos or LSP's among the decay products will generally lead to missing transverse energy (E / T ). The final state consisting of three leptons and E / T (and little hadronic activity) has few SM backgrounds and is the subject of the present analysis. 6The spectra of the transverse momenta (p T ) of the final state leptons can be relatively soft due to the three-body decays of the W 1 and Z 2 involving massive non-interacting particles. Figure 1 shows the expected p T spectra of the final state leptons as well as the E / T distribution at the physics generator level for simulated W 1 Z 2 → 3l events, with M W 1 = 56 GeV/c 2 . These Monte Carlo events follow the mass relation common to many SUSY models:The data used in this analysis were obtained using the DØ detector at the Fermilab Tevatron pp collider operating at a center of mass energy of 1.8 TeV. The total integrated luminosity used in this analysis from the 1992-1993 Tevatron run was 12.5 ± 0.7 pb −1 .The DØ detector has three major subsystems: central tracking detectors (with no central magnetic field), uranium-liquid argon electromagnetic and hadronic calorimeters, and a muon spectrometer. The detector and data acquisition system are described in detail elsewhere [9]. The central tracking system is used to identify charged tracks in the pseudorapidity range |η| ≤ 3.5. The calorimeters provide full angular coverage for |η| ≤ 4.0, with transverse segmentation ∆η × ∆φ = 0.1 × 0.1, where φ is the azimuthal angle. The muon system consists of proportional drift chambers and magnetized iron toroids with coverage extending to |η| ≤ 3.3.Electrons were identified as calorimeter clusters having at least 90% of their energy deposition in the electromagnetic calorimeter, with one or more tracks pointing to the cluster.Jets were reconstructed from energy deposition in the calorimeters using a cone algorithm with cone size R = √ ∆η 2 + ∆φ 2 = 0.5. Muon tracks were reconstructed using hits in the muon drift chambers; their momenta were calculated from the bend of the tracks in the toroids.Combinations of single lepton and dile...

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Top quark search with the D0 1992–1993 data sample

Cited by 81 publications

References 55 publications

Top Quark Physics at the Tevatron

Top Quark Physics at the Tevatron

Heavy quark results at D0

Search forW̃1Z̃2Production

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