Search for the direct production of charginos and neutralinos in $\sqrt{s}$ = 13 TeV $pp$ collisions with the ATLAS detector

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 Standard Model background expectation is observed. Limits are derived in scenarios of ${\tilde{\chi }}_1^{+}{\tilde{\chi }}_1^{-}$ pair production and of ${\tilde{\chi }}_1^{\pm }{\tilde{\chi }}_2^0$ and ${\tilde{\chi }}_1^{+}{\tilde{\chi }}_1^{-}$ production in simplified models where the neutralinos and charginos decay solely via intermediate left-handed staus and tau sneutrinos, and the mass of the ${\tilde{\tau }}_{\mathrm{L}}$ state is set to be halfway between the masses of the ${\tilde{\chi }}_1^{\pm }$ and the ${\tilde{\chi }}_1^0$. Chargino masses up to 630 GeV are excluded at 95% confidence level in the scenario of direct production of ${\tilde{\chi }}_1^{+}{\tilde{\chi }}_1^{-}$ for a massless ${\tilde{\chi }}_1^0$. Common ${\tilde{\chi }}_1^{\pm }$, ${\tilde{\chi }}_2^0$ masses up to 760 GeV are excluded in the case of production of ${\tilde{\chi }}_1^{\pm }{\tilde{\chi }}_2^0$ and ${\tilde{\chi }}_1^{+}{\tilde{\chi }}_1^{-}$ assuming a massless ${\tilde{\chi }}_1^0$. Exclusion limits for additional benchmark scenarios with large and small mass-splitting between the ${\tilde{\chi }}_1^{\pm }$ and the ${\tilde{\chi }}_1^0$ are also studied by varying the ${\tilde{\tau }}_{\mathrm{L}}$ mass between the masses of the ${\tilde{\chi }}_1^{\pm }$ and the ${\tilde{\chi }}_1^0$.

47 pages in total, author list starting page 31, 8 figures, 9 tables, published in EPJC, All figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/SUSY-2016-23/

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