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Published December 1, 2014 | Published + Submitted
Journal Article Open

New Observables for CP Violation in Higgs Decays


Current experimental data on the 125 GeV Higgs boson still allow room for large CP violation. The observables usually considered in this context are triple product asymmetries, which require an input of four visible particles after imposing momentum conservation. We point out a new class of CP-violating effects in Higgs physics without recourse to triple products. They may arise if the process involves an interference of different intermediate particles, which provide distinct "strong phases" in the form of the Breit-Wigner widths in addition to possible "weak phases" that arise from CP violating couplings of the Higgs in the Lagrangian. As an example, we propose a forward-backward asymmetry of the charged lepton in the three-body Higgs decay, h → ℓ^−ℓ^+γ, as a probe for CP-violating Higgs couplings to Zγ and γγ pairs. Other processes exhibiting this type of CP-violation are also discussed.

Additional Information

© 2014 American Physical Society. Received 12 June 2014; published 9 December 2014. A. F. and R. V. M. are supported by the ERC Advanced Grant Higgs@LHC. Y. C. is supported by the Weston Havens Foundation and DOE Grant No. DE-FG02-92-ER-40701. I. L. is supported in part by the U.S. Department of Energy under Contracts No. DE-AC02- 06CH11357 at ANL and No. DE-SC0010143 at NU. Three of the authors (A. F., I. L., and R. V. M.) would also like to thank the participants of the workshop "After the Discovery: Hunting for a Non-Standard Higgs Sector" at Centro de Ciencias de Benasque Pedro Pascual for lively atmosphere and discussions.

Attached Files

Published - PhysRevD.90.113006.pdf

Submitted - 1405.6723v1.pdf


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