Speaker
Description
We study dark shower signals from a dark QCD sector, with the Z boson being the main portal between the Standard Model and the dark QCD sector. It can be achieved by integrating out heavy electroweak doublet dark quarks or from the mixing between the Z boson and a dark Z' coupling to the dark quarks. The lightest dark hadrons are assumed to be GeV-scale dark pions. The dark pions decays mediated by the Z boson typically have decay lengths in the range of 1 mm to 10 m. We show that the current displaced di-muon resonance searches at CMS and LHCb can be recasted for the dark showers searches from the Z decay and dark pion searches from FCNC B meson decays, probing parameter regions beyond the bounds from the electroweak precision measurements and other indirect constraints. Future reaches at the LHC, including auxiliary detectors (FASER, Codex-b, MATHUSLA) and other experiments will be discussed.
