2017/05/12 by Hooman Davoudiasl, Davoudiasl, Hooman
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #High Energy Physics - Phenomenology (hep-ph) #hep-ex #hep-ph
paper · pdf · doi:10.48550/arxiv.1705.04764
Revtex4, 3 pages, one figure. Based on an invited talk of the same title presented by the author at the 22nd International Spin Symposium, September 25-30, 2016, at the University of Illinois Urbana-Champaign
arxiv created 2017/05/12 · arxiv updated 2017/05/16
We outline the phenomenology of the "dark" Z, denoted by Zd, which is a generalization of the "dark" photon hypothesis. Whereas the dark photon interacts with the Standard Model through kinetic mixing, Zd is assumed also to have mass-mixing with the Z boson. In particular, we highlight the possibility of Zd contributions to low Q2 parity violation measurements and rare Higgs decays H→ Z Zd → 4 ℓ, where ℓ is a charged lepton. The parity violation effects of a Zd with an intermediate mass ∼ 10-35 GeV can in principle relieve the mild ∼ 1.8σ tension among various measurements of the weak mixing angle θW. We briefly comment on the prospects for future parity violation experiments at low Q2 to probe this scenario, which could have correlated signals in rare Higgs decays at the LHC.