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Search for the direct production of charginos and neutralinos in final states with tau leptons in √s=13 TeV pp collisions with the ATLAS detector

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Article number154
<mark>Journal publication date</mark>22/02/2018
<mark>Journal</mark>European Physical Journal C: Particles and Fields
Issue number2
Volume78
Number of pages33
<mark>State</mark>Published
<mark>Original language</mark>English

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 χ˜+1χ˜−1 pair production and of χ˜±1χ˜02 and χ˜+1χ˜−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 τ˜L state is set to be halfway between the masses of the χ˜±1 and the χ˜01. Chargino masses up to 630 GeV are excluded at 95% confidence level in the scenario of direct production of χ˜+1χ˜−1 for a massless χ˜01. Common χ˜±1 and χ˜02 masses up to 760 GeV are excluded in the case of production of χ˜±1χ˜02 and χ˜+1χ˜−1 assuming a massless χ˜01. Exclusion limits for additional benchmark scenarios with large and small mass-splitting between the χ˜±1 and the χ˜01 are also studied by varying the τ˜L mass between the masses of the χ˜±1 and
the χ˜01.

Bibliographic note

EPJC is an open-access journal funded by SCOAP3 and licensed under CC BY 4.0