Abstract
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 pair production and of and production in simplified models where the neutralinos and charginos decay solely via intermediate left-handed staus and tau sneutrinos, and the mass of the tilde{tau }_{mathrm L} state is set to be halfway between the masses of the and the . Chargino masses up to 630 GeV are excluded at 95% confidence level in the scenario of direct production of for a massless . Common and masses up to 760 GeV are excluded in the case of production of and assuming a massless . Exclusion limits for additional benchmark scenarios with large and small mass-splitting between the and the are also studied by varying the tilde{tau }_{mathrm L} mass between the masses of the and the .
Highlights
Supersymmetry (SUSY) [1,2,3,4,5,6,7] postulates the existence of a superpartner, referred to as a sparticle, whose spin differs by one half unit from each corresponding Standard Model (SM) partner
The mT2 distribution is shown in Fig. 6 for data, expected SM backgrounds, and the SUSY reference points defined in Sect
Chargino masses up to 630 GeV are excluded for a massless lightest neutralino in the scenario of direct production of chargino pairs
Summary
Supersymmetry (SUSY) [1,2,3,4,5,6,7] postulates the existence of a superpartner, referred to as a sparticle, whose spin differs by one half unit from each corresponding Standard Model (SM) partner. Final states with tau leptons originating from stau decays are of particular interest for SUSY searches. The models are designed to enhance the probability of experimental observation In both models, the lightest neutralino is the LSP and purely bino, the stau and tau sneutrino are assumed to be mass-degenerate, and the τ1 is assumed to be purely τL. Diboson events with W W or Z Z decaying into τ τ νν final states contain two tau leptons and large ETmiss from the neutrinos. In a previous similar search by the ATLAS Collaboration using the 8 TeV Run-1 dataset [29], χ1± masses up to 345 GeV were excluded in the scenario at of. The combined LEP limits on the stau and chargino masses are mτ > 87–93 GeV (depending on mχ10 ) and mχ1± > 103.5 GeV [32,33,34,35,36], respectively
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