Disentangling CP phases in nearly degenerate resonances: neutralino production via Higgs at a muon collider

Details Disentangling CP phases in nearly degenerate resonances: neutralino production via Higgs at a muon collider Disentangling CP phases in nearly degenerate resonances: neutralino production via Higgs at a muon collider

2007-11-14

arxiv.org/abs/0711.2253v2

JHEP 0801:017,2008

Physics

High Energy Physics

High Energy Physics - Phenomenology

36 pages, 10 figures, minor typos corrected, to appear in JHEP

Scientific paper

10.1088/1126-6708/2008/01/017

In the CP-violating Minimal Supersymmetric Standard Model, we study the pair production of neutralinos at center-of-mass energies around the heavy neutral Higgs boson resonances. For longitudinally polarized muon beams, we analyze CP asymmetries which are sensitive to the interference of the two heavy neutral Higgs bosons. Due to radiatively induced scalar-pseudoscalar transitions, the CP asymmetries can be strongly enhanced when the resonances are nearly degenerate, as in the Higgs decoupling limit. The Higgs couplings to the neutralino sector can then be analyzed in the presence of CP violating phases. We present a detailed numerical analysis of the cross sections, neutralino branching ratios, and the CP observables. We find that radiatively induced CP violation in the Higgs sector leads to sizable CP-asymmetries, which are accessible in future measurements at a muon collider. However, we expect that our proposed method should be applicable to other processes with nearly degenerate scalar resonances, even at hadron colliders.

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