Search for anomalous production of prompt like-sign lepton pairs at the square root of s = 7 TeV with the ATLAS detector

Dominick Olivito, University of Pennsylvania

Abstract

An inclusive search for anomalous production of two prompt, isolated leptons with the same electric charge is presented. The search is performed in a data sample corresponding to 4.7 fb−1 of integrated luminosity collected in 2011 at [special characters omitted] = 7 TeV with the ATLAS detector at the LHC. Pairs of high- pT leptons (e± e±, e±μ ±, and μ±μ±) are selected, and the dilepton invariant mass distribution is examined for any deviation from the Standard Model expectation. No excess is found, and upper limits on the production of like-sign lepton pairs due to contributions from physics beyond the Standard Model are placed as a function of the dilepton mass within a fiducial region close to the experimental selection criteria. The 95% confidence level upper limits on the cross section of anomalous e±e±, e±μ±, or μ ±μ± production range between 1.7 fb and 64.1 fb depending on the dilepton mass and flavor combination. The same data are interpreted in the context of a search for a narrow doubly-charged resonance, using the doubly-charged Higgs boson as a benchmark model. The masses of doubly-charged Higgs bosons are constrained depending on the branching ratio into these leptonic final states. Assuming pair production, coupling to left-handed fermions, and a branching ratio of 100% for each final state, masses below 409 GeV, 375 GeV, and 398 GeV are excluded for e ±e±, e ±μ±, and μ±μ ±, respectively.

Subject Area

Particle physics

Recommended Citation

Olivito, Dominick, "Search for anomalous production of prompt like-sign lepton pairs at the square root of s = 7 TeV with the ATLAS detector" (2012). Dissertations available from ProQuest. AAI3551535.
https://repository.upenn.edu/dissertations/AAI3551535

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