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

Abstract

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.

Authors:
 [1];  [2];  [3];  [4];  [5];  [6]
+ Show Author Affiliations
  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)
Publication Date:
Research Org.:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP)
OSTI Identifier:
1156494
Report Number(s):
FERMILAB-PUB-13-540-T
Journal ID: ISSN 1029-8479; arXiv eprint number arXiv:1312.2955
Grant/Contract Number:  
AC02-07CH11359
Resource Type:
Accepted Manuscript
Journal Name:
Journal of High Energy Physics (Online)
Additional Journal Information:
Journal Name: Journal of High Energy Physics (Online); Journal Volume: 2014; Journal Issue: 4; Journal ID: ISSN 1029-8479
Publisher:
Springer Berlin
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; Higgs physics; Beyond Standard Model; CP violation

Citation Formats

Bishara, Fady, Grossman, Yuval, Harnik, Roni, Robinson, Dean J., Shu, Jing, and Zupan, Jure. Probing CP violation in $h\rightarrow\gamma\gamma$ with converted photons. United States: N. p., 2014. Web. doi:10.1007/JHEP04(2014)084.
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Bishara, Fady, Grossman, Yuval, Harnik, Roni, Robinson, Dean J., Shu, Jing, & Zupan, Jure. Probing CP violation in $h\rightarrow\gamma\gamma$ with converted photons. United States. https://doi.org/10.1007/JHEP04(2014)084
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Bishara, Fady, Grossman, Yuval, Harnik, Roni, Robinson, Dean J., Shu, Jing, and Zupan, Jure. Fri . "Probing CP violation in $h\rightarrow\gamma\gamma$ with converted photons". United States. https://doi.org/10.1007/JHEP04(2014)084. https://www.osti.gov/servlets/purl/1156494.
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@article{osti_1156494,
title = {Probing CP violation in $h\rightarrow\gamma\gamma$ with converted photons},
author = {Bishara, Fady and Grossman, Yuval and Harnik, Roni and Robinson, Dean J. and Shu, Jing and Zupan, Jure},
abstractNote = {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.},
doi = {10.1007/JHEP04(2014)084},
journal = {Journal of High Energy Physics (Online)},
number = 4,
volume = 2014,
place = {United States},
year = {Fri Apr 11 00:00:00 EDT 2014},
month = {Fri Apr 11 00:00:00 EDT 2014}
}
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Journal Article:
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Publisher's Version of Record
https://doi.org/10.1007/JHEP04(2014)084
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Works referenced in this record:

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    C P -odd component of the lightest neutral Higgs boson in the MSSM
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    Higgs decay into two photons in a warped extra dimension
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