The latest LHC Run 1 search for contact interactions and large extra dimensions with dielectrons and dimuons is now published in Eur. Phys. J. C, see EPJC 74 (2014) 3134 or http://arxiv.org/abs/1407.2410. The data sample corresponds to about 20 inverse femtobarns of proton-proton collisions collected by the ATLAS detector in 2012 at a collision energy of 8 TeV. Prof. Willocq and Graduate Student Varol have led the analysis of the dimuon channel. Varol completed her dissertation on this topic and earned her Ph.D. degree in 2014.

See the dimuon mass distribution (first figure on the right) with colored curves showing the expected distributions in the presence of new phenomena from contact interactions or large extra dimensions.

A novel aspect of this search is the inclusion of the muon angular distribution (second figure on the right) for the first time at the LHC, in addition to the dimuon mass distribution, as an independent observable sensitive to new phenomena in the dimuon final state.

For more information, see https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/EXOT-2013-19/.