Abstract
Recently the ATLAS experiment has reported 3.0 σ excess in an on-Z signal region in searches for supersymmetric particles. We find that the next-to-minimal supersymmetric standard model can explain this excess by the production of gluinos which mainly decay via g ˜ → g χ ˜ 2 , 3 0 → g Z χ ˜ 1 0 $$ \tilde{g}\to g{\tilde{\chi}}_{2,3}^0\to gZ{\tilde{\chi}}_1^0 $$ where χ ˜ 2 , 3 0 $$ {\tilde{\chi}}_{2,3}^0 $$ and χ ˜ 1 0 $$ {\tilde{\chi}}_1^0 $$ are the Higgsino and the singlino-like neutralinos, respectively. We show that the observed dark matter density is explained by the thermal relic density of the singlino-like neutralino, simultaneously. We also discuss the searches for the Higgs sector of this scenario at the Large Hadron Collider.