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Title: Probing CP violation in $$h\rightarrow\gamma\gamma$$ with converted photons

Journal Article · · Journal of High Energy Physics (Online)
 [1];  [2];  [3];  [4];  [5];  [6]
  1. Univ. of Cincinnati, Cincinnati, OH (United States); Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
  2. Cornell Univ., Ithaca, NY (United States)
  3. Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
  4. Chinese Academy of Sciences (CAS), Beijing (China); Univ. of California, Berkeley, CA (United States)
  5. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Univ. of California, Berkeley, CA (United States)
  6. Univ. of Cincinnati, Cincinnati, OH (United States)
+ Show Author Affiliations

We study Higgs diphoton decays, in which both photons undergo nuclear conversion to electron- positron pairs. The kinematic distribution of the two electron-positron pairs may be used to probe the CP violating (CPV) coupling of the Higgs to photons, that may be produced by new physics. Detecting CPV in this manner requires interference between the spin-polarized helicity amplitudes for both conversions. We derive leading order, analytic forms for these amplitudes. In turn, we obtain compact, leading-order expressions for the full process rate. While performing experiments involving photon conversions may be challenging, we use the results of our analysis to construct experimental cuts on certain observables that may enhance sensitivity to CPV. We show that there exist regions of phase space on which sensitivity to CPV is of order unity. As a result, the statistical sensitivity of these cuts are verified numerically, using dedicated Monte-Carlo simulations.

Research Organization:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), High Energy Physics (HEP)
Grant/Contract Number:
AC02-07CH11359
OSTI ID:
1156494
Report Number(s):
FERMILAB-PUB-13-540-T; arXiv eprint number arXiv:1312.2955
Journal Information:
Journal of High Energy Physics (Online), Vol. 2014, Issue 4; ISSN 1029-8479
Publisher:
Springer BerlinCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 39 works
Citation information provided by
Web of Science

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Cited By (11)

Effective field theory approach to LHC Higgs data journal August 2016
C P -odd component of the lightest neutral Higgs boson in the MSSM journal May 2015
Higgs decay into two photons in a warped extra dimension journal May 2014
Determination of the Higgs CP-mixing angle in the tau decay channels at the LHC including the Drell–Yan background journal November 2014
Probing $$\textit{CP}$$ CP -violating Higgs and gauge-boson couplings in the Standard Model effective field theory journal October 2017
Determination of the Higgs CP-mixing angle in the tau decay channels at the LHC including the Drell-Yan background text January 2014
Constraining CP-violating Higgs Sectors at the LHC using gluon fusion text January 2014
Flavor and CP violation in Higgs decays text January 2014
CP violation with a dynamical Higgs text January 2014
Effective field theory approach to LHC Higgs data text January 2015
Better Higgs-CP Tests Through Information Geometry text January 2017

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Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
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Beyond Standard Model
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