Search for an excess of events with an identical flavour lepton pair and significant missing transverse momentum in sqrt{s} = 7 TeV proton-proton collisions with the ATLAS detector

Abstract

Results are presented of a search for supersymmetric particles decaying into final states with significant missing transverse momentum and exactly two identical flavour leptons (e or mu) of opposite charge in sqrt{s}=7 TeV collisions at the Large Hadron Collider. This channel is particularly sensitive to supersymmetric particle cascade decays producing flavour correlated lepton pairs. Flavour uncorrelated backgrounds are subtracted using a sample of opposite flavour lepton pair events. Observation of an excess beyond Standard Model expectations following this subtraction procedure would offer one of the best routes to measuring the masses of supersymmetric particles. In a data sample corresponding to an integrated luminosity of 35 pb-1 no such excess is observed. Model-independent limits are set on the contribution to these final states from new physics and are used to exclude regions of a phenomenological supersymmetric parameter space.

6 pages plus author list (19 pages total), 3 figures, 1 table, submitted to EPJC

References in corpus (19)

• PYTHIA 6.4 Physics and Manual
• PYTHIA 6.2 Physics and Manual
• The anti-k_t jet clustering algorithm
• HERWIG 6.5: an event generator for Hadron Emission Reactions With Interfering Gluons (including supersymmetric processes)
• ALPGEN, a generator for hard multiparton processes in hadronic collisions
• Matching NLO QCD computations and parton shower simulations
• The ATLAS Simulation Infrastructure
• Implications of CTEQ global analysis for collider observables
• Single-top hadroproduction in association with a W boson
• Matching NLO QCD and parton showers in heavy flavour production
• Multiparton Interactions in Photoproduction at HERA
• Squark and Gluino Production at Hadron Colliders
• Precision SUSY Measurements at LHC
• Parton Distributions for LO Generators
• Single-top production in MC@NLO
• On measuring the masses of pair-produced semi-invisibly decaying particles at hadron colliders
• Measurement of the W -> lnu and Z/gamma* -> ll production cross sections in proton-proton collisions at sqrt(s) = 7 TeV with the ATLAS detector
• Supersymmetric particle mass measurement with the boost-corrected contransverse mass
• Supersymmetric particle mass measurement with invariant mass correlations

Cited by in corpus (20)

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• Constrained Supersymmetry after two years of LHC data: a global view with Fittino
• Search for supersymmetry in final states with jets, missing transverse momentum and one isolated lepton in sqrt{s} = 7 TeV pp collisions using 1 fb-1 of ATLAS data
• Inclusive search for supersymmetry using the razor variables in pp collisions at sqrt(s) = 7 TeV
• Inclusive search for squarks and gluinos in pp collisions at sqrt(s) = 7 TeV
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• Search for supersymmetry in pp collisions at sqrt(s)=7 TeV in events with a single lepton, jets, and missing transverse momentum
• Light NMSSM Higgs bosons in SUSY cascade decays at the LHC
• Search for supersymmetry with razor variables in pp collisions at sqrt(s) = 7 TeV
• Natural NMSSM confronting with the LHC7-8
• Study of LHC Searches for a Lepton and Many Jets
• Lepton flavour violation: physics potential of a Linear Collider
• On cascade decays of squarks at the LHC in NLO QCD
• Improving estimates of the number of fake leptons and other mis-reconstructed objects in hadron collider events: BoB's your UNCLE. (Previously "The Matrix Method Reloaded")
• SUSY searches at ATLAS
• Search for anomalous production of multiple leptons in association with W and Z bosons at CDF
• Entangled System of Squarks from the Third Generation at the Large Hadron Collider
• RGE Effects on neutrino masses in partial split supersymmetry