“Dark” Z implications for parity violation, rare meson decays, and Higgs physics

Hooman Davoudiasl, Hye-Sung Lee, and William J. Marciano
Phys. Rev. D 85, 115019 – Published 25 June 2012

Abstract

General consequences of mass mixing between the ordinary Z boson and a relatively light Zd boson, the “dark” Z, arising from a U(1)d gauge symmetry, associated with a hidden sector such as dark matter, are examined. New effects beyond kinetic mixing are emphasized. ZZd mixing introduces a new source of low energy parity violation well explored by possible future atomic parity violation and planned polarized electron scattering experiments. Rare K(B) meson decays into π(K)+ (=e, μ) and π(K)νν¯ are found to already place tight constraints on the size of ZZd mixing. Those sensitivities can be further improved with future dedicated searches at K and B factories as well as binned studies of existing data. ZZd mixing can also lead to the Higgs decay HZZd, followed by Z1+1 and Zd2+2 or “missing energy,” providing a potential hidden sector discovery channel at the Large Hadron Collider. An illustrative realization of these effects in a 2 Higgs doublet model is presented.

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  • Received 30 March 2012

DOI:https://doi.org/10.1103/PhysRevD.85.115019

© 2012 American Physical Society

Authors & Affiliations

Hooman Davoudiasl*, Hye-Sung Lee, and William J. Marciano

  • Department of Physics, Brookhaven National Laboratory, Upton, New York 11973, USA

  • *hooman@bnl.gov
  • hlee@bnl.gov
  • marciano@bnl.gov

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Issue

Vol. 85, Iss. 11 — 1 June 2012

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