Probing CP violation in h → γγ with converted photons
- Fady BisharaDepartment of Physics, University of Cincinnati, 345 Clifton Ct., Cincinnati, OH 45221, U.S.A.
- Yuval Grossman(Department of Physics, LEPP, Cornell University, 109 Clark Hall, Ithaca, NY 14853, U.S.A.)
- Roni Harnik(Theoretical Physics Department, Fermilab, P.O. Box 500, Batavia, IL 60510, U.S.A.)
- Dean J. Robinson(State Key Laboratory of Theoretical Physics and, Kavli Institute for Theoretical Physics China (KITPC), Institute of Theoretical Physics, Chinese Academy of Sciences, Beijing 100190, P.R. China)
- Jing Shu(Ernest Orlando Lawrence Berkeley National Laboratory, University of California, 1 Cyclotron Road, Berkeley, CA 94720, U.S.A.)
- Jure Zupan(Department of Physics, University of Cincinnati, 345 Clifton Ct., Cincinnati, OH 45221, U.S.A.)
DOIAbstract
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 CP...
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