# Explanation of the ATLAS Z-peaked excess by squark pair production in the NMSSM

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Journal of High Energy Physics

, 2015:178

First Online: 27 October 2015Received: 05 August 2015Revised: 24 September 2015Accepted: 08 October 2015 Abstract

The ATLAS collaboration recently reported a 3σ excess in the leptonic-Z + jets + ET 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 + ET 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.

KeywordsSupersymmetry Phenomenology ArXiv ePrint: 1507.08471

Autor: Junjie Cao - Liangliang Shang - Jin Min Yang - Yang Zhang