Abstract
The ATLAS collaboration recently reported a 3σ excess in the leptonic-Z + jets + E miss T channel. We intend to interpret this excess by squark pair production in the Next-to-Minimal Supersymmetric Standard Model (NMSSM). The decay chain we employ is \( \tilde{q}\to q{\tilde{\chi}}_2^0\to q{\tilde{\chi}}_1^0Z \), where \( {\tilde{\chi}}_1^0 \) and \( {\tilde{\chi}}_2^0 \) denote the lightest and the next-to-lightest neutralinos with singlino and bino as their dominant components respectively. Our simulations indicate that after considering the constraints from the ATLAS searches for jets + E miss T signal the central value of the excess can be obtained for \( {m}_{\tilde{q}}\lesssim 1.2\mathrm{T}\mathrm{e}\mathrm{V} \), and if the constraint from the CMS on-Z search is further considered, more than 10 signal events are still attainable for \( {m}_{\tilde{q}}\lesssim 750\mathrm{GeV} \). Compared with the interpretation by gluino pair production, the squark explanation allows for a significantly wider range of \( {m}_{\tilde{q}} \) as well as a less compressed SUSY mass spectrum. We also show that the squark explanation will be readily tested at the initial stage of the 14 TeV LHC.
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Cao, J., Shang, L., Yang, J.M. et al. Explanation of the ATLAS Z-peaked excess by squark pair production in the NMSSM. J. High Energ. Phys. 2015, 178 (2015). https://doi.org/10.1007/JHEP10(2015)178
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DOI: https://doi.org/10.1007/JHEP10(2015)178