Abstract
Three searches for direct top squark pair production are presented. They target different decay modes, each with two leptons (electrons or muons) in the final state. The searches use 20.3 fb−1 of pp collision data at √s = 8 TeV collected by the ATLAS experiment at the Large Hadron Collider. No excesses over Standard Model expectations are observed, and the results are interpreted under the separate assumptions that the light top squark decays to a b -quark and the lightest chargino, or to a t -quark and the lightest neutralino.
Highlights
Supersymmetry (SUSY) is an extension to the Standard Model (SM) that provides a solution to the instability of the scalar SM sector with respect to new high-scale physics by introducing supersymmetric partners of the known fermions and bosons
In the framework of a generic R-parity conserving minimal supersymmetric extension of the SM (MSSM), SUSY particles are produced in pairs and the lightest supersymmetric particle (LSP) is stable, and provides a dark matter candidate
If the transverse momenta of the two reconstructed b-quarks in the event are taken as p1T and p2T, and the lepton transverse momenta are added vectorially to the ETmiss in the event, the resulting mT2(b, b, + + ETmiss)has a very different kinematic limit: for top pair production it is approximately bound by the mass of the top, whilst for the stop decays the bound is strongly correlated to m(t1) − m(χ±1 )
Summary
Supersymmetry (SUSY) is an extension to the Standard Model (SM) that provides a solution to the instability of the scalar SM sector with respect to new high-scale physics by introducing supersymmetric partners of the known fermions and bosons. These particles differ from their SM counterparts by half a unit of spin. Run in generic SUSY searches favour a spectrum containing heavy u, d, s, c These proceedings summarize the results of three different searches for stops in events with two isolated leptons (e, μ) with opposite charge, two b-quarks and significant missing transverse momentum (ETmiss), described in Ref. The last section (Section 4) includes the interpretation of the observed results
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