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Precise predictions for Higgs production in neutralino decays in the complex MSSM. (English) Zbl 1269.81212

Summary: Complete one-loop results are obtained for the class of processes \( \tilde{\chi}_i^0 \to \tilde{\chi}_j^0{h_a} \) in the MSSM where all parameters entering this process beyond lowest order are allowed to have arbitrary \( \mathcal{C}\mathcal{P} \)-violating phases. An on-shell renormalisation scheme is worked out for the chargino-neutralino sector that properly takes account of imaginary parts arising from complex parameters and from absorptive parts of loop integrals. The genuine vertex contributions to the neutralino decay amplitudes are combined with two-loop propagator-type corrections for the outgoing Higgs boson. In this way the currently most precise prediction for this class of processes is obtained. The numerical impact of the genuine vertex corrections is studied for several examples of \( \mathcal{C}\mathcal{P} \)-conserving and \( \mathcal{C}\mathcal{P} \)-violating scenarios. We find that significant effects on the decay widths and branching ratios are possible even in the \( \mathcal{C}\mathcal{P} \)-conserving MSSM. In the \( \mathcal{C}\mathcal{P} \)-violating CPX benchmark scenario the corrections to the decay width are found to be particularly large, namely, of order 45% for a Higgs mass of 40 GeV. This parameter region of the CPX scenario where a very light Higgs boson is unexcluded by present data is analysed in detail. We find that in this parameter region, which will be difficult to cover by standard Higgs search channels at the LHC, the branching ratio for the decay \( \tilde{\chi}_2^0 \to \tilde{\chi}_1^0{h_1} \) is large. This may offer good prospects to detect such a light Higgs boson in cascade decays of supersymmetric particles.

MSC:

81V22 Unified quantum theories
81T60 Supersymmetric field theories in quantum mechanics
81T15 Perturbative methods of renormalization applied to problems in quantum field theory
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