Abstract
Recently the ATLAS collaboration reported a 3 excess in the leptonic- Z +jets+E miss channel. This may be interpreted in the Next-to-Minimal Supersymmetric Standard Model (NMSSM) by gluino pair production with the decay chain ~! q q ~ 0 ! q qZ ~ 0 , where ~ 0 and ~ 0 denote the lightest and the next-to-lightest neutralinos with singlino and bino as their dominant components respectively. After exploring the relevant parameter space of the NMSSM by considering the constraints from the ATLAS searches for jets +E miss signals, we conclude that the NMSSM is able to explain the excess at 1 level with the number of the signal events reaching its measured central value in optimal cases, and the best explanation comes from a compressed spectrum such as m~ g' 650GeV, m ~ 0 ' 565GeV and m ~ 0 ' 465GeV. We also check the consistency of the ATLAS results with the null result of the CMS on-Z search. We nd that under the CMS limits at 95% C.L., the event number of the ATLAS on-Z signal can still reach 11 in our scenario, which is about 1:2 away from the measured central value.
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