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Published April 1, 2020 | Published + Submitted
Journal Article Open

CP-violating dark photon interaction


We introduce a scenario for CP-violating (CPV) dark photon interactions in the context of non-abelian kinetic mixing. Assuming an effective field theory that extends the Standard Model (SM) field content with an additional U(1) gauge boson (X) and a SU(2_)L triplet scalar, we show that there exist both CP-conserving and CPV dimension five operators involving these new degrees of freedom and the SM SU(2)_L gauge bosons. The former yields kinetic mixing between the X and the neutral SU(2)_L gauge boson (yielding the dark photon), while the latter induces CPV interactions of the dark photon with the SM particles. We discuss experimental probes of these interactions using searches for permanent electric dipole moments (EDMs) and di-jet correlations in high-energy pp collisions. It is found that the experimental limit on the electron EDM currently gives the strongest restriction on the CPV interaction. In principle, high energy pp collisions provide a complementary probe through azimuthal angular correlations of the two forward tagging jets in vector boson fusion. In practice, observation of the associated CPV asymmetry is likely to be challenging.

Additional Information

© 2020 The Author(s). Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. Funded by SCOAP3. (Received 23 March 2019; revised manuscript received 29 September 2019; accepted 22 March 2020; published 8 April 2020) We would like to thank Junya Nakamura for helpful discussions. X.-G. H. and G. L. are supported in part by the MOST (Grant No. MOST 106-2112-M-002-003-MY3), Key Laboratory for Particle Physics, Astrophysics and Cosmology, Ministry of Education, and Shanghai Key Laboratory for Particle Physics and Cosmology (Grant No. 15DZ2272100), and in part by the NSFC (Grants No. 11575111 and No. 11735010). K. F. and M. R.-M. are supported in part under the U.S. Department of Energy Award No. DE-SC0011095.

Attached Files

Published - PhysRevD.101.075016.pdf

Submitted - 1902.10340.pdf


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