Search for displaced muonic lepton jets from light Higgs boson decay in proton-proton collisions at √s = 7 TeV with the ATLAS detector . Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics Volume 721, Issue 1, 2013, Pages

A search is performed for collimated muon pairs displaced from the primary vertex produced in the decay of long-lived neutral particles in proton-proton collisions at √s = 7 TeV centre-of-mass energy, with the ATLAS detector at the LHC. In a 1.9 fb-1event sample collected during 2011, the observed data are consistent with the Standard Model background expectations. Limits on the product of the production cross section and the branching ratio of a Higgs boson decaying to hidden-sector neutral long-lived particles are derived as a function of the particles mean lifetime.