A search for prompt lepton-jets in $pp$ collisions at $\sqrt{s}=7$ TeV with the ATLAS detector

(2013) Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics — Vol. 719, p. 299 (2013)

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Abstract
We present a search for a light (mass <2GeV) 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 5fb^-^1 of s=7TeV proton-proton collision data marc: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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Tanasijczuk, A. J., ATLAS, & et al. (2013). A search for prompt lepton-jets in $pp$ collisions at $\sqrt{s}=7$ TeV with the ATLAS detector. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 719, 299. https://doi.org/10.1016/j.physletb.2013.01.034 (Original work published 2013)