Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2004-07-05
Eur.Phys.J. C37 (2004) 495-505
Physics
High Energy Physics
High Energy Physics - Phenomenology
20 pages, 6 figures, minor typos corrected, to appear in Eur. Phys. J. C
Scientific paper
10.1140/epjc/s2004-02014-1
We study the interference of resonant Higgs boson exchange in neutralino production in \mu^+ \mu^- annihilation with longitudinally polarized beams. We use the energy distribution of the decay lepton in the process \neutralino_j \to \ell^\pm \slepton^\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 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.
der Pahlen Federico von
Fraas Hans
Sachse Christoph
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