A search for the direct production of charginos and neutralinos in final states with at least two hadronically decaying tau leptons is presented. The analysis uses a dataset of pp collisions corresponding to an integrated luminosity of 36.1 fb−1, recorded with the ATLAS detector at the Large Hadron Collider at a centre-of-mass energy of 13 TeV. No significant deviation from the expected Standard Model background is observed. Limits are derived in scenarios of χ̃ +1χ̃ −1 pair production and of χ̃ ±1χ̃ 02 and χ̃ +1χ̃ −1 production in simplified models where the neutralinos and charginos decay solely via intermediate left-handed staus and tau sneutrinos, and the mass of the τ̃L state is set to be halfway between the masses of the χ̃ ±1 and the χ̃ 01. Chargino masses up to 630 GeV are excluded at 95% confidence level in the scenario of direct production of χ̃ +1χ̃ −1 for a massless χ̃ 01. Common χ̃ ±1 and χ̃ 02 masses up to 760 GeV are excluded in the case of production of χ̃ ±1χ̃ 02 and χ̃ +1χ̃ −1 assuming a massless χ̃ 01. Exclusion limits for additional benchmark scenarios with large and small mass-splitting between the χ̃ ±1 and the χ̃ 01 are also studied by varying the τ̃L mass between the masses of the χ̃ ±1 and the χ̃ 01.
|Original language||English (US)|
|State||Published - Aug 25 2017|
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