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A search for prompt lepton-jets in pp collisions at √s=7 TeV with the ATLAS detector

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Georges Aad, Bobby Acharya

Original languageUndefined/Unknown
Article numberN/A
Pages (from-to)299-317
Number of pages19
JournalPhys.Lett. B
Issue number4-5
Published26 Feb 2013

King's Authors


We present a search for a light (mass <2 GeV ) boson predicted by Hidden Valley supersymmetric models that decays into a final state consisting of collimated muons or electrons, denoted “lepton-jets”. The analysis uses 5 fb-1 of √s=7 TeV proton–proton collision data recorded by the ATLAS detector at the Large Hadron Collider to search for the following signatures: single lepton-jets with at least four muons; pairs of lepton-jets, each with two or more muons; and pairs of lepton-jets with two or more electrons. This study finds no statistically significant deviation from the Standard Model prediction and places 95% confidence-level exclusion limits on the production cross section times branching ratio of light bosons for several parameter sets of a Hidden Valley model.

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