Interference of Higgs boson resonances in μ^ + μ^- totilde{χ}^0_itilde{χ}^0_j with longitudinal beam polarization
Abstract
We study the interference of resonant Higgs boson exchange in neutralino production in μ^ + μ^- annihilation with longitudinally polarized beams. We use the energy distribution of the decay lepton in the process tilde{χ}^0_j to ell^{±} tilde{ell}^mp to determine the polarization of the neutralinos. In the CP-conserving minimal supersymmetric standard model a non-vanishing asymmetry in the lepton energy spectrum is caused by the interference of Higgs boson exchange channels with different CP-eigenvalues. The contribution of this interference is large if the heavy neutral bosons H and A are nearly degenerate. We show that the asymmetry can be used to determine the couplings of the neutral Higgs bosons to the neutralinos. In particular, the asymmetry allows one to determine the relative phase of the couplings. We find large asymmetries and cross sections for a set of reference scenarios with nearly degenerate neutral Higgs bosons.
- Publication:
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European Physical Journal C
- Pub Date:
- November 2004
- DOI:
- 10.1140/epjc/s2004-02014-1
- arXiv:
- arXiv:hep-ph/0407057
- Bibcode:
- 2004EPJC...37..495F
- Keywords:
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- High Energy Physics - Phenomenology
- E-Print:
- 20 pages, 6 figures, minor typos corrected, to appear in Eur. Phys. J. C