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

Abstract

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 $$-$$+ 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.

Authors:
 [1];  [2];  [3];  [2]
  1. California Inst. of Technology (CalTech), Pasadena, CA (United States). Lauritsen Lab. for High Energy Physics
  2. Centre National de la Recherche Scientifique (CNRS), Orsay (France). Lab. de Physique Theorique
  3. Argonne National Lab. (ANL), Argonne, IL (United States). High Energy Physics Division; Northwestern Univ., Evanston, IL (United States). Dept. of Physics and Astronomy
Publication Date:
Research Org.:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP); National Science Foundation (NSF)
OSTI Identifier:
1339095
Alternate Identifier(s):
OSTI ID: 1180096
Grant/Contract Number:  
AC02-06CH11357; FG02-92-ER-40701; SC0010143; AC02- 06CH11357
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Physical Review. D, Particles, Fields, Gravitation and Cosmology
Additional Journal Information:
Journal Volume: 90; Journal Issue: 11; Journal ID: ISSN 1550-7998
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS

Citation Formats

Chen, Yi, Falkowski, Adam, Low, Ian, and Vega-Morales, Roberto O. New observables for $CP$ violation in Higgs decays. United States: N. p., 2014. Web. doi:10.1103/PhysRevD.90.113006.
Chen, Yi, Falkowski, Adam, Low, Ian, & Vega-Morales, Roberto O. New observables for $CP$ violation in Higgs decays. United States. https://doi.org/10.1103/PhysRevD.90.113006
Chen, Yi, Falkowski, Adam, Low, Ian, and Vega-Morales, Roberto O. 2014. "New observables for $CP$ violation in Higgs decays". United States. https://doi.org/10.1103/PhysRevD.90.113006. https://www.osti.gov/servlets/purl/1339095.
@article{osti_1339095,
title = {New observables for $CP$ violation in Higgs decays},
author = {Chen, Yi and Falkowski, Adam and Low, Ian and Vega-Morales, Roberto O.},
abstractNote = {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.},
doi = {10.1103/PhysRevD.90.113006},
url = {https://www.osti.gov/biblio/1339095}, journal = {Physical Review. D, Particles, Fields, Gravitation and Cosmology},
issn = {1550-7998},
number = 11,
volume = 90,
place = {United States},
year = {Tue Dec 09 00:00:00 EST 2014},
month = {Tue Dec 09 00:00:00 EST 2014}
}

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Cited by: 39 works
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Works referenced in this record:

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Works referencing / citing this record:

Effective field theory approach to LHC Higgs data
journal, August 2016


Probing $$\textit{CP}$$ CP -violating Higgs and gauge-boson couplings in the Standard Model effective field theory
journal, October 2017


Constraints on CP-violating gauge-Higgs operators
text, January 2015


Distinguishing CP-odd couplings of the Higgs boson to weak boson pairs
text, January 2016