CP Asymmetry in Charged Higgs Decays to Chargino-Neutralino

Details CP Asymmetry in Charged Higgs Decays to Chargino-Neutralino CP Asymmetry in Charged Higgs Decays to Chargino-Neutralino

2007-07-31

arxiv.org/abs/0708.0026v1

Phys.Rev.D76:076008,2007

Physics

High Energy Physics

High Energy Physics - Phenomenology

23 pages, 8 figures, one table

Scientific paper

10.1103/PhysRevD.76.076008

We analyze the charge-parity (CP) asymmetry in the charged Higgs boson decays to chargino-neutralino pairs, H^- -> chargino_i + neutralino_j. We show first that these modes have a large branching ratio for m_H^- > 600 GeV. We use Cutkosky rules to obtain the analytical formulas needed for the evaluation of the asymmetry under consideration. We then calculate the CP asymmetry in chargino-neutralino decays by including supersymmetric mass bounds, as well as constraints from b -> s gamma, (g-2)_mu, Delta\rho and electric dipole moments. Finally, we discuss observability of the asymmetry at the LHC by calculating the number of required charged Higgs events to observe the asymmetry for each decay channel. We show that the inclusion of constraints considerably reduces the projected CP asymmetry, and that the optimal channel for observing the asymmetry is H^- -> chargino_1 + neutralino_2.

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