May 16 – 20, 2022
Europe/Zurich timezone

Prospects for dark boson searches via exotic Higgs decays in Run 3 and high luminosity era of the LHC

May 17, 2022, 7:00 PM
Experimental poster Feeble Interactions BSM Poster Session I


Tamer Elkafrawy (Florida Institute of Technology (US))


We investigate the potential reach of a search for a long-lived dark vector boson, a dark $Z$ or $Z_D$, through exotic decays of the standard model (SM) Higgs boson $h$ into either $Z_DZ_D$ or $ZZ_D$. In addition, we study a decay of $h$ into two dark Higgs bosons $h_Dh_D$. We consider the production of the SM Higgs boson at the large hadron collider (LHC) via gluon-gluon fusion and use production cross sections for Run 3 of the LHC (i.e., 14 TeV) calculated to a combination of next-to-next-to-next-to-leading order with QCD corrections (N$^{3}$LO QCD) and next-to-leading order with electroweak corrections (NLO EW) from the literature. The $Z_D$ production through the Higgs portal is completed via one of two mechanisms, kinetic mixing of $Z_D$ with the SM $Z$ boson and the mixing of $h_D$ with $h$. The branching fractions are calculated to NLO and scanned over the relevant mixing parameters and particle masses in Monte Carlo (MC) simulation using the {\textsc{MadGraph5}}_aMC@NLO v2.7.0 framework. We focus on a final state of multiple dimuon pairs, displaced up to \mbox{7500 mm}, where the muons can be reconstructed without vertex constraint using data from the ATLAS and CMS detectors to be collected in Run~3 of the LHC. Integrated luminosities of 300 and 3000 fb$^{-1}$ for Run 3 and High Luminosity (HL), respectively, of the LHC are used for estimating the expected search sensitivity of the LHC to each decay mode. Finally, we investigate the decay lengths of $Z_D$ and $h_D$ in the detectors as well as kinematics of the displaced dimuons in the final state.

Primary author

Tamer Elkafrawy (Florida Institute of Technology (US))


Marcus Hohlmann (Florida Institute of Technology (US)) Mehdi Rahmani (Florida Institute of Technology (US)) Paul Padley (Rice University (US)) Teruki Kamon (Texas A & M University (US)) Hyunyong Kim (Texas A & M University (US))

Presentation materials