A search for prompt lepton-jets in pp collisions at √s = 8TeV with the ATLAS detector Aad, G. Aguilar Saavedra, Juan Antonio Atlas Collaboration, / Hadron-Hadron scattering A search is presented for a new, light boson with a mass of about 1 GeV and decaying promptly to jets of collimated electrons and/or muons (lepton-jets). The analysis is performed with 20.3 fb−1 of data collected by the ATLAS detector at the Large Hadron Collider in proton-proton collisions at a centre-of-mass energy of 8 TeV. Events are required to contain at least two lepton-jets. This study finds no statistically significant deviation from predictions of the Standard Model and places 95% confidence-level upper limits on the contribution of new phenomena beyond the SM, incuding SUSY-portal and Higgs-portal models, on the number of events with lepton-jets. 2024-10-16T10:34:38Z 2024-10-16T10:34:38Z 2016-02-09 journal article Aad, G. & Rodríguez Chala, M. & Atlas Collaboration. J. High Energ. Phys. 2016, 62 (2016). [https://doi.org/10.1007/JHEP02(2016)062] https://hdl.handle.net/10481/96014 10.1007/JHEP02(2016)062 eng http://creativecommons.org/licenses/by/4.0/ open access Atribución 4.0 Internacional Springer