Hidden Higgs decaying to lepton jets

The Higgs and some of the Standard Model superpartners may have been copiously produced at LEP and the Tevatron without being detected We study a novel scenario of this type in which the Higgs decays predominantly into a light hidden sector either directly or through light SUSY states Subsequent cascades increase the multiplicity of hidden sector particles which, after decaying back into the Standard Model, appear in the detector as clusters of collimated leptons known as lepton jets We identify the relevant collider observables that characterize this scenario, and study a wide range of LEP and Tevation scarches to recover the viable regions in the space of observables. We find that the Higgs decaying to lepton jets can be hidden when the even topology mimics that of hadronic backgrounds Thus, as many of 10(4) leptonic Higgs and SUSY decays may be hiding in the LEP and Tevation data. We present benchmark models with a 100 GeV Higgs that are consistent with all available collider constraints We end with a short discussion of strategies for dedicated searches at LEP, the Tevatron and the LHC, that allow for a discovery of the Higgs or SUSY particles decaying to lepton jets