P-even, CP-violating Signals in Scalar-Mediated Processes

Abstract

Most studies of Higgs sector CP violation focus on the detection of CP-violating neutral Higgs-fermion Yukawa couplings, which yield P-odd, CP-violating phenomena. There is some literature on purely bosonic signatures of Higgs sector CP violation, where the simultaneous observation of three processes (suitably chosen) constitutes a signal of P-even CP violation. However, in the examples previously analyzed, some of the processes are strongly suppressed in the approximate Higgs alignment limit (corresponding to the existence of a Standard Model like Higgs boson as suggested by LHC data), in which case the proposed CP-violating signals are difficult to observe in practice. In this paper, we extend the existing literature by examining processes that do not vanish in the Higgs alignment limit and whose simultaneous observation would provide unambiguous evidence for scalar-mediated P-even CP violation. We assess the discovery potential of such signals at various future multi-TeV lepton (and $\gamma \gamma$) colliders. The potential for detecting loop-induced P-even, CP-violating phenomena is also considered.

arXiv comment58 pages, 10 figures, 10 tables. One reference added in version 2. New footnote 15 and a number of additional references added in version 3. Clarifications added at the beginning of Section 4 and some references updated in version 4. A few typographical errors corrected in version 5, which now approximately matches the published version

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