An inclusive search for anomalous production of two prompt, isolated muons with the same electric charge is presented. The search is performed in a data sample corresponding to 1. 6 fb^−1 of integrated luminosity collected in 2011 at s=7 TeV with the ATLAS detector at the LHC. Muon pairs are selected by requiring two isolated muons of the same electric charge with pT>20 GeV and |𝜂|<2. 5. Minimal requirements are placed on the rest of the event activity. The distribution of the invariant mass of the muon pair 𝑚 (𝜇𝜇) is found to agree well with the background expectation. Upper limits on the cross section for anomalous production of two muons with the same electric charge are placed as a function of 𝑚 (𝜇𝜇) within a fiducial region defined by the event selection. The fiducial cross-section limit constrains the like-sign top-quark pair-production cross section to be below 3. 7 pb at 95% confidence level. The data are also analyzed to search for a narrow like-sign dimuon resonance as predicted for e. g. doubly charged Higgs bosons (H^++). Assuming pair production of H^++ bosons and a branching ratio to muons of 100% (33%), this analysis excludes masses below 355 (244) GeV and 251 (209) GeV for H^++ bosons coupling to left-handed and right-handed fermions, respectively.
Aad et al. (Fri,) studied this question.
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