Probing the CP nature of the Higgs bosons by \(t\overline{t}\) productionat photon linear colliders

  • E. Asakawa
  • K. Hagiwara
theoretical physics

Abstract.

We study the effects of heavy Higgs bosons on the \(t\overline{t}\) production process at photon linear colliders. The interference patterns between the resonant Higgs production amplitudes and the continuum QED amplitudes are examined. The patterns tell us not only the CP nature of the Higgs bosons but also the phase of the \(\gamma\gamma\)-Higgs vertex which gives new information about the Higgs couplings to new charged particles. We point out that it is necessary to use circularly polarized photon beams to produce efficiently heavy Higgs bosons whose masses exceed the electron beam energy, and show that the above interference patterns of the production amplitudes can be studied by observing t and \(\overline{t}\) decay angular distributions. Analytic expressions for the helicity amplitudes for the sequential process \(\gamma\gamma \rightarrow t \overline{t} \rightarrow (bW^ + ) (\overline{b}W^-) \rightarrow (b f_1 \overline{f}_2) (\overline{b} f_3 \overline{f}_4)\) are presented in terms of the generic \(\gamma\gamma \rightarrow t \overline{t}\) production amplitudes.

Keywords

Charged Particle Higgs Boson Angular Distribution Beam Energy Interference Pattern 

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. 1.
    K. Abe [ACFA Linear Collider Working Group Collaboration], Particle Physics Experiments at JLC, hep-ph/0109166Google Scholar
  2. 2.
    J. Aguilar-Saavedra [ECFA/DESY LC Physics Working Group Collaboration], Physics at an \(e^+ e^-\) Linear Collider, hep-ph/0106315Google Scholar
  3. 3.
    T. Abe [American Linear Collider Working Group Collaboration], in Proceedings of the APS/DPF/DPB Summer Study on the Future of Particle Physics (Snowmass 2001) edited by R. Davidson, C. Quigg, SLAC-R-570 Resource book for Snowmass 2001, 30 June-21 July 2001, Snowmass, ColoradoGoogle Scholar
  4. 4.
    I.F. Ginzburg, G.L. Kotkin, S.L. Panfil, V.G. Selbo, V.I. Telnov, Nucl. Instrum. Meth. A 219, 5 (1984)CrossRefGoogle Scholar
  5. 5.
    M.M. Muhlleitner, M. Kramer, M. Spira, P.M. Zerwas, Phys. Lett. B 508, 311 (2001)CrossRefGoogle Scholar
  6. 6.
    G.V. Jikia, Nucl. Phys. B 405, 24 (1993)CrossRefGoogle Scholar
  7. 7.
    B. Grazadkowski, J.F. Ginion, Phys. Lett. B 294, 361 (1992)CrossRefGoogle Scholar
  8. 8.
    K. Hagiwara, Nucl. Instrum. Meth. A 472, 12 (2001)CrossRefGoogle Scholar
  9. 9.
    E. Asakawa, J. Kamoshita, A. Sugamoto, I. Watanabe, Eur. Phys. J. C 14, 335 (2000)Google Scholar
  10. 10.
    E. Asakawa, S.Y. Choi, K. Hagiwara, J.S. Lee, Phys. Rev. D 62, 115005 (2000)CrossRefGoogle Scholar
  11. 11.
    R.M. Godbole, S.D. Rindani, R.K. Singh, Phys. Rev. D 67, 095009 (2003)CrossRefGoogle Scholar
  12. 12.
    P. Niezurawski, A.F. Zarnecki, M. Krawczyk, JHEP 0211, 034 (2002)CrossRefGoogle Scholar
  13. 13.
    K. Hagiwara, D. Zeppenfeld, Nucl. Phys. B 274, 1 (1986)CrossRefGoogle Scholar
  14. 14.
    J.F. Gunion, H.E. Haber, G. Kane, S. Dawson, Higgs hunter’s guide (Addison-Wesley Publishing Company 1990), and references thereinGoogle Scholar
  15. 15.
    E. Asakawa, K. Hagiwara, in preparationGoogle Scholar
  16. 16.
    K. Hagiwara, H. Murayama, I. Watanabe, Nucl. Phys. B 367, 257 (1991)CrossRefGoogle Scholar
  17. 17.
    M. Jeżabek, J.H. Kühn, Nucl. Phys. B 320, 20 (1989)CrossRefGoogle Scholar
  18. 18.
    M. Diehl, O. Nachtman, Z. Phys. C 62, 397 (1994)Google Scholar
  19. 19.
    A. Djouadi, J. Kalinowski, M. Spira, Comm. Phys. Commun. Res. 108, 56 (1998)MATHGoogle Scholar
  20. 20.
    H. Murayama, I. Watanabe, K. Hagiwara, HELAS: HELicity Amplitude Subroutines for Feynman Diagram Evaluations, KEK Report 91-11 (1992)Google Scholar

Copyright information

© Springer-Verlag Berlin/Heidelberg 2003

Authors and Affiliations

  • E. Asakawa
    • 1
    • 2
  • K. Hagiwara
    • 2
  1. 1.University of TokyoTokyoJapan
  2. 2.Theory Group KEKIbarakiJapan

Personalised recommendations