Abstract
Searches for the production of electroweak supersymmetric particles decaying into final states with exactly two isolated, oppositely-charged leptons (electrons, muons) and missing transverse momentum are performed using 20.3 fb-1 of 2012 proton-proton collision data at s=8 TeV recorded with the general purpose detector ATLAS at the Large Hardon Collider. The negative search results are interpreted in the framework of simplified Supersymmetry models and in various scenarios of the phenomenological Minimal Supersymmetric Standard Model [Search for direct production of charginos, neutralinos and sleptons in final states with two leptons and missing transverse momentum in pp collisions at s=8 TeV with the ATLAS detector, JHEP 05 (2014) 071. arXiv:1403.5294 [hep-ex]].
Highlights
Weak scale Supersymmetry (SUSY) is one of the best motivated extensions of the Standard Model (SM), providing a possible solution to the hierarchy problem and a viable dark matter candidate in the form of the lightest supersymmetric particle (LSP)
The searches presented here target final states with two leptons and missing energy. They can appear inproduction followed by± → ±χ 01 leptons, or decay giving rise to by χ±1 χ∓1 production a pair of ”same followed by χ±1 flavour” → ( ̃±ν or ±ν) → ±νχ01 decay to leptons of same or different flavours and two additional neutrinos contributing to the missing transverse momentum
The three SR-mT2 signal regions are optimised to provide sensitivity to sleptons either through direct production or in chargino decays, while the three SR-WW signal regions are targeting charginoand neutralino-pair production followed by on-shell W decays
Summary
Weak scale Supersymmetry (SUSY) is one of the best motivated extensions of the Standard Model (SM), providing a possible solution to the hierarchy problem and a viable dark matter candidate in the form of the lightest supersymmetric particle (LSP). TeVs, direct production of weak gauginos (charginos, χ± and neutralinos, χ0) as well as sleptons ( ̃ and ν) may be the dominant SUSY process. The searches presented here target final states with two leptons and missing energy. They can appear in ̃ production followed by± → ±χ 01 leptons, or decay giving rise to by χ±1 χ∓1 production a pair of ”same followed by χ±1 flavour” → ( ̃±ν or ±ν) → ±νχ decay to leptons of same or different flavours and two additional neutrinos contributing to the missing transverse momentum. In scenarios with a lightest chargino χ±1 heavier than the LSP, the chargino decays as χ±1 → W±χ01, producing an on- or off-shell W
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