New observables for $CP$ violation in Higgs decays

Chen, Yi; Falkowski, Adam; Low, Ian; Vega-Morales, Roberto O.

doi:10.1103/PhysRevD.90.113006

Title: New observables for $CP$ violation in Higgs decays

Journal Article · Tue Dec 09 00:00:00 EST 2014 · Physical Review. D, Particles, Fields, Gravitation and Cosmology

DOI:https://doi.org/10.1103/PhysRevD.90.113006· OSTI ID:1339095

Chen, Yi ^[1]; Falkowski, Adam ^[2]; Low, Ian ^[3]; Vega-Morales, Roberto O. ^[2]

California Inst. of Technology (CalTech), Pasadena, CA (United States). Lauritsen Lab. for High Energy Physics
Centre National de la Recherche Scientifique (CNRS), Orsay (France). Lab. de Physique Theorique
Argonne National Lab. (ANL), Argonne, IL (United States). High Energy Physics Division; Northwestern Univ., Evanston, IL (United States). Dept. of Physics and Astronomy

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. Here, we point out a new class of $CP$ -violating observables in Higgs physics which require only three reconstructed momenta. They may arise if the process involves an interference of amplitudes with 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. In conclusion, we also discuss other processes exhibiting this type of $CP$ violation.

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Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), High Energy Physics (HEP); National Science Foundation (NSF)

Grant/Contract Number:: AC02-06CH11357; FG02-92-ER-40701; SC0010143; AC02- 06CH11357

OSTI ID:: 1339095

Alternate ID(s):: OSTI ID: 1180096

Journal Information:: Physical Review. D, Particles, Fields, Gravitation and Cosmology, Vol. 90, Issue 11; ISSN 1550-7998

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 39 works

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