  A search for microscopic black holes has been performed in a same-sign dimuon
final state using 1.3 fb^-1 of proton-proton collision data collected with the
ATLAS detector at a centre of mass energy of 7 TeV at the CERN Large Hadron
Collider. The data are found to be consistent with the expectation from the
Standard Model and the results are used to derive exclusion contours in the
context of a low scale gravity model.
