Skip to main content
Log in

A search for neutral Higgs bosons in the MSSM and models with two scalar field doublets

  • Experimental physics
  • Published:
The European Physical Journal C - Particles and Fields Aims and scope Submit manuscript

Abstract

A search is described for the neutral Higgs bosons h0 and A0 predicted by models with two scalar field doublets and, in particular, the Minimal Supersymmetric Standard Model (MSSM). The search in the Z0h0 and h0A0 production channels is based on data corresponding to an integrated luminosity of 25 pb−1 from e+e collisions at centre-of-mass energies between 130 and 172 GeV collected with the OPAL detector at LEP. The observation of a number of candidates consistent with Standard Model background expectations is used in combination with earlier results from data collected at the Z0 resonance to set limits on mh and ma in general models with two scalar field doublets and in the MSSM. For example, in the MSSM, for tan β > 1, minimal and maximal scalar top quark mixing and soft SUSY-breaking masses of 1 TeV, the 95% confidence level limits mh > 59.0 GeV and ma > 59.5 GeV are obtained. For the first time, the MSSM parameter space is explored in a detailed scan.

This is a preview of subscription content, log in via an institution to check access.

Access this article

Price excludes VAT (USA)
Tax calculation will be finalised during checkout.

Instant access to the full article PDF.

Similar content being viewed by others

References

  1. S.L. Glashow, J. Iliopoulos and L. Maiani, Phys. Rev. D2 (1970) 1285: S. Weinberg, Phys. Rev. Lett. 19 (1967) 1264; A. Salam, Elementary Particle Theory, ed. N. Svartholm (Almquist and Wiksells, Stockholm, 1968), 367

    ADS  Google Scholar 

  2. P.W. Higgs, Phys. Lett. 12 (1964) 132; F. Eriglert and R. Brout, Phys. Rev. Lett. 13 (1964) 321; G.S. Guralnik, C.R. Hagen, and T.W.B. Kibble, Phys. Rev. Lett. 13 (1964) 585

    ADS  Google Scholar 

  3. OPAL Collaboration, K. Ackerstaff et al., E. Phys. J. Cl (1998) 425

    Article  Google Scholar 

  4. Y.A. Gol’fand and E.P. Likhtman, JETP Lett. 13 (1971) 323; D.V. Volkov and V.P. Akulov, Phys. Lett. B46 (1973) 109: J. Wess and B. Zumino, Nucl. Phys. B70 (1974) 39; H.E. Haber and Y. Nir, Nucl. Phys B335 (1990) 363

    ADS  Google Scholar 

  5. G. ’t Hooft, in Recent Developments in Gauge Theories, Proceedings of the NATO Advanced Summer Institute, Cargese, 1979. edited by G. ’t Hooft et al. (Plenum, New York, 1980) p. 135–157; L. Susskind, Phys. Rep. 104 (1984) 181

    Google Scholar 

  6. H. P. Nilles. Phys. Rep. 110 (1984) 1; H.E. Haber and G.L. Kane, Phys. Rep. 117 (1985) 75; R. Barbieri et al., Z. Physics at LEP1, CERN 89-08 (1989) Vol. 2, 121; J.M. Frère, G.L. Kane, Nucl. Phys. B223 (1983) 331; J. Ellis et al., Phys. Lett. B123 (1983) 436; J. Ellis et al., Phys. Lett. B127 (1983) 233

    Article  ADS  Google Scholar 

  7. J. F. Gunion, H.E. Haber, G.L. Kane and S. Dawson, The Higgs Hunter’s Guide, Addison-Wesley Publishing Company, Reading, MA, 1990

    Google Scholar 

  8. OPAL Collaboration, K. Ackerstaff et al., Search for Charged Higgs bosons in e+ e collisions at √s = 130 172 GeV, CERN-PPE/97-168, to be published in Phys. Lett. B

  9. A. Djouadi et al., Proceedings e+e collisions at 500 GeV: The Physics Potential, Munich-Annecy Hamburg, ed. P.M. Zerwas, DESY 92-123A

  10. E. Accomando et al., Higgs Physics in Physics at LEP2, Editors: G. Altarelli, T. Sjöstrand and F. Zwirner, CERN 96–01 (1996)

  11. M. Carena, J.R. Espinosa, M. Quirós and C.E.M. Wagner, Phys. Lett. 355B (1995) 209

    ADS  Google Scholar 

  12. CDF Collaboration, F. Abe et al., Phys. Rev. Lett. 74 (1995) 2626; DO Collaboration, S. Abachi et al., Phys. Rev. Lett. 74 (1995) 2632

    Article  ADS  Google Scholar 

  13. OPAL Collaboration, R. Akers et al., Z. Phys. C64 (1994) 1

    ADS  Google Scholar 

  14. OPAL Collaboration, G. Alexander et al., Z. Phys. C73 (1997) 189

    Google Scholar 

  15. OPAL Collaboration, G. Alexander et al., Phys. Lett. B377 (1996) 273

    ADS  Google Scholar 

  16. P. Bock, Determination of exclusion limits for particle production using different decay channels with different efficiencies, mass resolutions and backgrounds, Heidelberg Institute Preprint HD-PY96-05 (1996)

  17. ALEPH Collaboration, D. Buskulic et al., Phys. Lett. B313 (1993) 312; ALEPH Collaboration, R. Barate et al., Phys. Lett. B412 (1997) 173; DELPHI Collaboration, P. Abreu et al., Z. Phys. C67 (1995) 69; DELPHI Collaboration, P. Abreu et al., E. Phys. J. C2 (1998) 1. L3 Collaboration, O. Adriani et al., Z. Phys. C57 (1993) 355; L3 Collaboration, M. Acciarri et al., Phys. Lett. B385 (1996) 454

    ADS  Google Scholar 

  18. OPAL Collaboration, K. Ahmet et al., Nucl. Inst, and Meth. A305 (1991) 275

    Google Scholar 

  19. S. Anderson et al., Nucl. Inst. and Meth. A403 (1998) 326

    ADS  Google Scholar 

  20. B.E. Anderson et al., IEEE Transactions on Nuclear Science 41 (1994) 845

    Article  ADS  Google Scholar 

  21. OPAL Collaboration, K. Ackerstaff et al., Phys. Lett. B391 (1997) 221. Phys. Lett. B

    ADS  Google Scholar 

  22. OPAL Collaboration, R. Akers et al., Phys. Lett. B327 (1994) 397

    ADS  Google Scholar 

  23. OPAL Collaboration, K. Ackerstaff et al., E. Phys. J. C2 (1998) 213

    Article  ADS  Google Scholar 

  24. OPAL Collaboration, M.Z. Akrawy et al., Phys. Lett. B253 (1991) 511

    ADS  Google Scholar 

  25. N. Brown and W.J. Stirling, Phys. Lett. B252 (1990) 657; S. Bethkc, Z. Kunszt, D. Soper and W.J. Stirling, Nucl. Phys. B370 (1992) 310; S. Catani et al., Phys. Lett. B269 (1991) 432; N. Brown and W.J. Stirling, Z. Phys. C53 (1992) 629

    ADS  Google Scholar 

  26. OPAL Collaboration, K. Ackerstaff et al., Z. Phys. C74 (1997) 1; OPAL Collaboration, R. Akers et al., Z. Phys. C66 (1995) 19

    Google Scholar 

  27. OPAL Collaboration, R. Akers et al., Z. Phys. C65 (1995) 17

    ADS  Google Scholar 

  28. OPAL Collaboration, R. Akers et al., Phys. Lett. B327 (1994) 411

    ADS  Google Scholar 

  29. OPAL Collaboration, G. Alexander et al., Z. Phys. C52 (1991) 175

    ADS  Google Scholar 

  30. HZHA 2.0 generator: P. Janot, in Physics at LEP2, Eds. G. Altarelli, T. Sjöstrand and F. Zwirner, CERN 96-01 (1996), Vol. 2, p. 309

  31. PYTHIA 5.7 and JETSET 7.4 generators: T. Sjöstrand, Comp. Phys. Comm. 82 (1994) 74; T. Sjöstrand, LU TP 95-20 and CERN-TH.7112/93 (revised August 1995)

    Article  ADS  Google Scholar 

  32. EXCALIBUR generator: F.A. Berends, R. Pittau, R, Kleiss, Comp. Phys. Comm. 85 (1995) 437

    Article  ADS  Google Scholar 

  33. The grc4f 1.2 generator: J. Fujimoto et al., Comp. Phys. Comm. 100 (1997) 128

    Article  ADS  Google Scholar 

  34. BHWIDE generator: S. Jadach, W. Placzek, B.F.L. Ward, in Physics at LEP2, edited by G. Altarelli, T. Sjöstrand and F. Zwirner, CERN 96-01, Vol. 2 (1996), p. 286; UTHEP-95-1001

  35. KORALZ 4.0 generator: S. Jadach, B.F.L. Ward, Z. Ws, Comp. Phys. Comm. 79 (1994) 503

    Article  ADS  Google Scholar 

  36. PHOJET 1.05 generator: E. Budinov et al., in Physics at LEP2, edited by G. Altarelli, T. Sjöstrand and F. Zwirner, CERN 96-01, Vol. 2 (1996) p. 216; R. Engel and J. Ranft, Phys. Rev. D54 (1996) 4244

  37. J.A.M. Vermaseren, Nucl. Phys. B229 (1983) 347

    Article  ADS  Google Scholar 

  38. J. Allison et al., Nucl. Inst. and Meth. A317 (1992) 47

    ADS  Google Scholar 

  39. OPAL Collaboration, G. Alexander et al., Z. Phys. C52 (1991) 175

    ADS  Google Scholar 

  40. OPAL Collaboration, G. Alexander et al., Phys. Lett. B376 (1996) 232

    ADS  Google Scholar 

  41. G. Parisi, Phys. Lett. B74 (1978) 65; J.F. Donoghue, F.E. Low and S.Y. Pi, Phys. Rev. D20 (1979) 2759

    ADS  MathSciNet  Google Scholar 

  42. OPAL Collaboration, R. Akers, Z. Phys. C61 (1994) 209; DELPHI Collaboration, P. Abreau, Phys. Lett. B347 (1995) 447

    ADS  Google Scholar 

  43. G. Marchesini et al., Comp. Phys. Comm. 67 (1992) 465

    Article  ADS  Google Scholar 

  44. R.D. Cousins, V.L. Highland, Nucl. Inst. and Meth. A320 (1992) 331

    ADS  Google Scholar 

  45. R.M. Barnett et al., Phys. Rev. D54 (1996) 1, and 1997 off-year partial update for the 1998 edition available on the PDG WWW pages (URL: http://pdg.lbl.gov/)

    ADS  MathSciNet  Google Scholar 

  46. D. Bardin et al., CERN-TH 6443/92 (May 1992); Phys. Lett. B255 (1991) 290; Nucl. Phys. B351 (1991) 1; Z. Phys. C44 (1989) 493; We usezITTEr version 5.0 with default parameters, and with the following input parameters: mz = 91.187GeV, mt = (175±5) GeV, α(mz) = 1/128.896, αs(mz) = 0.118 ±0.003(experimental error) ±0.003(higher order correction). The prediction for the leptonic branching ratio of the Z0 was found not to change significantly when the Higgs mass was varied between 0 < mh < 50 GeV

    Google Scholar 

  47. OPAL Collaboration, P.D. Acton et al., Phys. Lett. B268 (1991) 122

    ADS  Google Scholar 

  48. A. Djouadi, J. Kalinowski and M. Spira, HDECAY: a Program for Higgs Boson Decays in the Standard Model and its Supersymmetric Extension, Preprint DESY-97- 079, April 1997

  49. E. Accomando et al., Event Generators for Discovery Physics, hep-ph/9602203, Feb. 1996, and in “Physics at LEP2”, eds. G. Altarelli, T. Sjöstrand and F. Zwirner, CERN 96-01, Vol. 2 (1996) 299

  50. F.A. Berends and R. Kleiss, Nucl. Phys. 178 (1981) 141

    Article  ADS  Google Scholar 

  51. OPAL Collaboration, K. Ackerstaff et al., Z. Phys. C75 (1997) 409

    Google Scholar 

  52. J.M. Frère, D.R.T. Jones and S. Raby, Nucl. Phys. B222 (1983) 11; L. Alvarez-Gaumé, J. Polchinski and M. Wise, Nucl. Phys. B221 (1983) 495; J.P. Derendinger and C.A. Savoy, Nucl. Phys. B237 (1984) 307; C. Kounnas, A.B. Lahanas, D.V. Nanopoulos and M. Quirós, Nucl. Phys. B236 (1986) 438

    Article  ADS  Google Scholar 

  53. J.A. Casas, A. Lleyda and C. Muñoz, Nucl. Phys. B471 (1996) 3

    Article  ADS  Google Scholar 

  54. A. Kusenko, P. Langacker and G. Segre, Phys. Rev. D54 (1996) 5824

    ADS  Google Scholar 

  55. R. Hempfling, Phys. Lett. B296 (1992) 121; J. Rosiek and A. Sopczak, Phys. Lett. B341 (1995) 419

    ADS  Google Scholar 

Download references

Author information

Authors and Affiliations

Authors

Rights and permissions

Reprints and permissions

About this article

Cite this article

Ackerstaff, K., Alexander, G., Allison, J. et al. A search for neutral Higgs bosons in the MSSM and models with two scalar field doublets. Eur. Phys. J. C 5, 19–40 (1998). https://doi.org/10.1007/s100529800931

Download citation

  • Received:

  • Issue Date:

  • DOI: https://doi.org/10.1007/s100529800931

Keywords

Navigation