Hadroproduction of Top for mt ∼ mw

  • D. Denegri
Part of the Ettore Majorana International Science Series book series (EMISS, volume 44)


We discuss features of top production and decay at CERN and Fermilab pp̄ collider energies for top masses mt ∼ mw. In this mass range the top decays into t → W + b (physical W) and the pp̄ → tt̄ → W+W- bb̄ final-state kinematics is rather specific. It is characterized by large transverse momenta \(p_T^t \sim p_t^w\sim {m_1}/2\) , highly unbalanced transverse momenta of the two top decay products \(p_T^w \gg p_T^b\) , making the decay b-jets rather difficult to identify, and with very dispersed and unbalanced W decay products (lepton-neutrino or qq̄). In this context, we briefly discuss the few peculiar events observed by UA1 and UA2, as these might well be ‘early manifestations’ of the top in this mass range. We also discuss the competing single-W + 2-jet background interpretations of these events. Finally, tt̄ production up to Large Hadron Collider energies is discussed: cross-sections, kinematical distributions and their mass and energy dependence, and the apparent production of WW final states.


Large Hadron Collider Transverse Momentum Transverse Momentum Distribution Large Hadron Collider Energy Jacobian Peak 
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  1. [1]
    A. Ali et al., Nucl. Phys. B292 (1987); B. Van Eijk, ‘EUROJET: a QCD based Monte Carlo program including perturbatively calculated higher order processes in proton-antiproton interactions’, Proc. New Particles ’85 Conf., Madison, Wisconsin (1985);Google Scholar
  2. [1]
    B. Van Eijk, Ph.D. Thesis, University of Amsterdam (1987).Google Scholar
  3. [2]
    P. Nason, S. Dawson and K. Ellis, ‘The total cross-section for the production of heavy quarks in hadronic collisions’, Fermilab-Pub-87/222-T (1987).Google Scholar
  4. [3]
    G. Altarelli, M. Diemoz, G. Martinelli and P. Nason, ‘Total cross-section for heavy flavour production in hadronic collisions and QCD’, preprint CERN-TH 4978/88 (1988).Google Scholar
  5. [4]
    P. Colas and D. Denegri, Phys. Lett. B195 (1987) 295; UA1 TN 86–89, September 1986, unpublished;Google Scholar
  6. [4]
    P. Colas, ‘Etude de la production d’électrons accompagnés de jets dans l’expérience UA1; recherche du quark top’, Thèse de Doctorat d’Etat, Université Paris VI (1987), note CEA-N-2571.Google Scholar
  7. [5]
    G. Altarelli et al., Proc. Workshop on Physics at Future Accelerators, La Thuile and Geneva, 1987, CERN 87–07 (1987); D. Froideveaux et al., ibid.Google Scholar
  8. [6]
    a) C. Albajar et al., UAl Collaboration, Phys. Lett. B193 (1987) 389;Google Scholar
  9. [6]
    b) P. Bagnaia et al., UA2 Collaboration, Phys. Lett. B139 (1984) 105;Google Scholar
  10. [6]
    R. Ansari et al., UA2 Collaboration, Phys. Lett. B194 (1987) 158.Google Scholar
  11. [7]
    S. Gupta and D.P. Roy, Z. Phys. C39 (1988) 417;Google Scholar
  12. [7]
    R. Kleiss et al., Z. Phys. C39 (1988) 393;Google Scholar
  13. [7]
    S. Geer et al., Phys. Lett. B192 (1987) 223.Google Scholar
  14. [8]
    H. Baer, V. Barger, H. Goldberg and R.J.N. Phillips, ‘Top quark signatures at the Tevatron collider’, MAD/PH/367, and references therein; F. Halzen et al., ‘Top quark signatures at the Tevatron collider’, MAD/PH/436; K.J. Foley et al., ‘Bottom and top physics’, SLAC-PUB-4426; see also: I. Bigi et al., ‘Production and decay properties of ultra-heavy quarks, SLAC-PUB-4021; A. Martin, Nucl. Phys. B (Proc. Suppl.) 1B (1988) 133.CrossRefGoogle Scholar
  15. [9]
    P. Colas, D. Denegri and C. Stubenrauch, Z. Phys. C40 (1988) 527, and references therein.Google Scholar
  16. [10]
    C. Albajar et al., UA1 Collaboration, Z. Phys. C37 (1988) 505.Google Scholar
  17. [11]
    a) C. Albajar et al., UA1 Collaboration, ‘Studies of intermediate vector boson production and decay in UA1 at the CERN Proton-Antiproton Collider’, CERN EP/88–168, November 1988;Google Scholar
  18. [11]
    also: G. Arnison et al., Lett. Nuovo Cimento 44 (1985) 1;CrossRefGoogle Scholar
  19. 8b).
    C. Stubenrauch, ‘Etude de la production de bosons W et Z dans l’expérience UA1’, Thèse de Doctorat d’Etat, Université de Paris-Sud (1987), note CEA-N-2532.Google Scholar
  20. [12]
    C. Albajar et al., UA1 Collaboration, Phys. Lett. B198 (1987) 271.Google Scholar
  21. [13]
    Y. Giraud-Héraud, ‘Mise en évidence de la désintégration du Wen τν’, Thèse de Doctorat d’Etat, Université d’Orsay, 1988, Collège de France preprint 88–01 (1988).Google Scholar
  22. [14]
    G. Bauer et al., UA1 TN 87–09 (1987).Google Scholar
  23. [15]
    B. Andrieu and D. Denegri, UA1 internal report: ‘Meeting of the Working Group on UAl at High Luminosity’, 1988; B. Andrieu, Ph.D. Thesis, Collège de France, in preparation.Google Scholar
  24. [16]
    S.D. Ellis et al., Phys. Lett. B154 (1985) 389.Google Scholar
  25. [17]
    E. Eichten, I. Hinchliffe, K. Lane and C. Quigg, Rev. Mod. Phys. 56 (1984) 579.CrossRefGoogle Scholar
  26. [18]
    M. Diemoz, F. Ferroni, E. Longo and G. Martinelli, Z. Phys. C39 (1988) 31.Google Scholar
  27. [19]
    J. Proudfoot, CDF Collaboration, ‘W boson production in pp̄ collisions at \( \sqrt S \) = 1.8 TeV’, ANL-HEP-CP-88–61 (1988).Google Scholar
  28. [20]
    G. Altarelli et al., Z. Phys. C27 (1985) 617.Google Scholar
  29. [21]
    W.J. Stirling, R. Kleiss and S.D. Ellis, Phys. Lett. B163 (1985) 261; see also: J.F. Gunion, Z. Kunszt and M. Soldate, Phys. Lett. B163 (1985) 389.Google Scholar
  30. [22]
    R.N. Cahn et al., Phys. Rev. D35 (1987) 1626;Google Scholar
  31. [22]
    R. Kleiss and W.J. Stirling, Phys. Lett. B200 (1987) 193, and references therein.Google Scholar
  32. [23]
    G. Altarelli, ‘An update of the Higgs search at the LHC’, CERN TH-5017/88 (1988).Google Scholar
  33. [23]
    R.N. Cahn, ‘Two gauge boson physics at future colliders’, LBL-25078 (1988), and references therein.Google Scholar

Copyright information

© Springer Science+Business Media New York 1989

Authors and Affiliations

  • D. Denegri
    • 1
    • 2
  1. 1.CERNGenevaSwitzerland
  2. 2.CENSaclayFrance

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