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This Letter presents a search for quantum black-hole production using 20.3inverse fb of data collected with the ATLAS detector in pp collisions at theLHC at sqrt(s) = 8 TeV. The quantum black holes are assumed to decay into alepton (electron or muon) and a jet. In either channel, no event with alepton-jet invariant mass of 3.5 TeV or more is observed, consistent with theexpected background. Limits are set on the product of cross sections andbranching fractions for the lepton+jet final states of quantum black holesproduced in a search region for invariant masses above 1 TeV. The combined 95%confidence level upper limit on this product for quantum black holes withthreshold mass above 3.5 TeV is 0.18 fb. This limit constrains the thresholdquantum black-hole mass to be above 5.3 TeV in the model considered.

physical review letters

Search for Quantum Black-Hole Production in High-Invariant-Mass  Lepton+Jet Final States Using Proton-Proton Collisions at sqrt(s) = 8 TeV and  the ATLAS Detector