• Open Access

Low Q2 weak mixing angle measurements and rare Higgs decays

Hooman Davoudiasl, Hye-Sung Lee, and William J. Marciano
Phys. Rev. D 92, 055005 – Published 2 September 2015

Abstract

A weighted average weak mixing angle θW derived from relatively low Q2 experiments is compared with the standard model prediction obtained from precision measurements. The approximate 1.8 sigma discrepancy is fit with an intermediate mass (1035GeV) “dark” Z boson Zd, corresponding to a U(1)d gauge symmetry of hidden dark matter, which couples to our world via kinetic and ZZd mass mixing. Constraints on such a scenario are obtained from precision electroweak bounds and searches for the rare Higgs decays HZZd4 charged leptons at the LHC. The sensitivity of future anticipated low Q2 measurements of sin2θW(Q2) to intermediate mass Zd is also illustrated. This dark Z scenario can provide interesting concomitant signals in low energy parity violating measurements and rare Higgs decays at the LHC over the next few years.

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  • Received 11 July 2015

DOI:https://doi.org/10.1103/PhysRevD.92.055005

This article is available under the terms of the Creative Commons Attribution 3.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.

Published by the American Physical Society

Authors & Affiliations

Hooman Davoudiasl1, Hye-Sung Lee2, and William J. Marciano1

  • 1Department of Physics, Brookhaven National Laboratory, Upton, New York 11973, USA
  • 2CERN, Theory Division, CH-1211 Geneva 23, Switzerland

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Issue

Vol. 92, Iss. 5 — 1 September 2015

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