2015/06/30 by Seng Pei Liew, Alberto Mariotti, Kentarou Mawatari +2 · 1 citation
Physics and Astronomy · #hep-ph #hep-ex
paper · pdf · doi:10.1016/j.physletb.2015.09.035
9 pages, 7 figures, 1 table; v2: the CMS binned on-Z analyses added, resulting in a small change in the best fit benchmark; v3: some issues clarified, fig.7 added, version to appear in PLB
arxiv created 2015/10/01 · arxiv updated 2015/10/07
We study a possible explanation of a 3.0 σ excess recently reported by the ATLAS Collaboration in events with Z-peaked same-flavour opposite-sign lepton pair, jets and large missing transverse momentum in the context of gauge-mediated SUSY breaking with more than one hidden sector, the so-called goldstini scenario. In a certain parameter space, the gluino two-body decay chain g→ gχ01,2→ gZ G' becomes dominant, where χ01,2 and G' are the Higgsino-like neutralino and the massive pseudo-goldstino, respectively, and gluino pair production can contribute to the signal. We find that a mass spectrum such as m g∼ 1000 GeV, m_χ01,2∼ 800 GeV and m G'∼ 600 GeV demonstrates the rate and the distributions of the excess, without conflicting with the stringent constraints from jets plus missing energy analyses and with the CMS constraint on the identical final state.