Search for anomalous production of prompt same-sign lepton pairs and pair-produced doubly charged Higgs bosons with $\sqrt{s}=8$ TeV $pp$ collisions using the ATLAS detector

Abstract

A low-background inclusive search for new physics in events with same-sign dileptons is presented. The search uses proton-proton collisions corresponding to 20.3 fb${}^{-1}$ of integrated luminosity taken in 2012 at a centre-of-mass energy of 8 TeV with the ATLAS detector at the LHC. Pairs of isolated leptons with the same electric charge and large transverse momenta of the type $e^{\pm }{e}^{\pm },e^{\pm }{\mu }^{\pm }$, and ${\mu }^{\pm }{\mu }^{\pm }$ are selected and their invariant mass distribution is examined. No excess of events above the expected level of Standard Model background is found. The results are used to set upper limits on the cross-sections for processes beyond the Standard Model. Limits are placed as a function of the dilepton invariant mass within a fiducial region corresponding to the signal event selection criteria. Exclusion limits are also derived for a specific model of doubly charged Higgs boson production.

32 pages plus author list + cover pages (54 pages total), 5 figures, 9 tables, published version, All figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/EXOT-2012-25/

References in corpus (26)

• PYTHIA 6.4 Physics and Manual
• Parton distributions for the LHC
• New parton distributions for collider physics
• Event generation with SHERPA 1.1
• Pileup subtraction using jet areas
• Vector boson pair production at the LHC
• Vector boson production at hadron colliders: a fully exclusive QCD calculation at NNLO
• Two-loop soft anomalous dimensions for single top quark associated production with a W- or H-
• MCFM for the Tevatron and the LHC
• NNLL resummation for s-channel single top quark production
• The PDF4LHC Working Group Interim Recommendations
• Simplified Models for a First Characterization of New Physics at the LHC
• Distinguishing seesaw models at LHC with multi-lepton signals
• Electron reconstruction and identification efficiency measurements with the ATLAS detector using the 2011 LHC proton-proton collision data
• t tbar W and t tbar Z Hadroproduction at NLO accuracy in QCD with Parton Shower and Hadronization effects
• A search for a doubly-charged Higgs boson in pp collisions at sqrt(s) = 7 TeV
• Type-III see-saw at LHC
• Prospects for the Zee-Babu Model at the LHC and low energy experiments
• Search for new physics in events with same-sign dileptons and b-tagged jets in pp collisions at sqrt(s) = 7 TeV
• Low Scale Flavor Gauge Symmetries
• Lepton number violation at the LHC with leptoquark and diquark
• Testing neutrino masses in little Higgs models via discovery of doubly charged Higgs at LHC
• Muon reconstruction efficiency and momentum resolution of the ATLAS experiment in proton-proton collisions at $\sqrt{s}$=7 TeV in 2010
• Testing a Neutrino Mass Generation Mechanism at the Large Hadron Collider
• Search for heavy Majorana neutrinos in mu+mu+[mu-mu-]+jets and e+e+[e-e-]+jets events in pp collisions at sqrt(s) = 7 TeV
• Correlative signatures of heavy Majorana neutrinos and doubly-charged Higgs bosons at the Large Hadron Collider

Cited by in corpus (8)

• Multilepton and Lepton Jet Probes of Sub-Weak-Scale Right-Handed Neutrinos
• Derivation of Dark Matter Parity from Lepton Parity
• Probing Doubly Charged Higgs Bosons at the LHC through Photon Initiated Processes
• LHC Phenomenology of Type II Seesaw: Nondegenerate Case
• Real singlet scalar dark matter extension of the Georgi-Machacek model
• Testing Type II Radiative Seesaw Model: from Dark Matter Detection to LHC Signatures
• Investigating the Quantum Properties of Jets and the Search for a Supersymmetric Top Quark Partner with the ATLAS Detector
• Searching for spin-3/2 leptons