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Correlated event excesses in LHC SUSY searches at 7 & 8 TeV: new physics or conspiring noise?

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Abstract

We examine the ATLAS and CMS 7 & 8 TeV multijet supersymmetry (SUSY) searches requiring the incidence of a single lepton in the framework of the supersymmetric grand unified model No-Scale Flipped SU(5) with extra vector-like flippon multiplets derived from F-Theory, or \(\mathcal{F}\mbox{--} \mathit{SU}(5)\) for short. Investigated are five multijet + lepton SUSY searches: 4.7 fb−1 ATLAS 7 TeV gluino and light stop searches, as well as 13 fb−1 ATLAS and 9.7 fb−1 CMS 8 TeV light stop searches. Most significantly, all five leptonic SUSY searches represent statistically independent data samples. Findings show that all five orthogonal sets of leptonic LHC observations give a lower bound to the gaugino mass scale at M 1/2≥680 GeV, with all the current best fits correlating within a narrow region. Furthermore, eight statistically independent LHC SUSY search regions (leptonic + all-hadronic) accessible to the No-Scale \(\mathcal{F}\mbox{--} \mathit{SU}(5)\) model space intersect with all the currently operating beyond the Standard Model experiments within the range of M 1/2=680–850 GeV, with the upper bound established by the lower experimental limit of the anomalous magnetic moment (g μ −2)/2 of the muon. We emphasize that this region of the \(\mathcal{F}\mbox{--} \mathit{SU}(5)\) model space may not be fully probed by leptonic SUSY searches at the LHC until the 13 TeV LHC energizes in 2015. Additionally, we describe an efficient technique for the effective statistical disentanglement of searches sensitive to mutually overlapping event spaces.

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Acknowledgements

This research was supported in part by the DOE grant DE-FG03-95-Er-40917 (TL and DVN), by the Natural Science Foundation of China under grant numbers 10821504, 11075194, 11135003, and 11275246 (TL), and by the Mitchell-Heep Chair in High Energy Physics (JAM). We also thank Sam Houston State University for providing high performance computing resources.

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Authors and Affiliations

  1. State Key Laboratory of Theoretical Physics and Kavli Institute for Theoretical Physics China (KITPC), Institute of Theoretical Physics, Chinese Academy of Sciences, Beijing, 100190, P.R. China

    Tianjun Li

  2. George P. and Cynthia W. Mitchell Institute for Fundamental Physics and Astronomy, Texas A&M University, College Station, TX, 77843, USA

    Tianjun Li, James A. Maxin & Dimitri V. Nanopoulos

  3. Department of Physics and Astronomy, Ball State University, Muncie, IN, 47306, USA

    James A. Maxin

  4. Astroparticle Physics Group, Houston Advanced Research Center (HARC), Mitchell Campus, Woodlands, TX, 77381, USA

    Dimitri V. Nanopoulos

  5. Division of Natural Sciences, Academy of Athens, 28 Panepistimiou Avenue, Athens, 10679, Greece

    Dimitri V. Nanopoulos

  6. Department of Physics, Sam Houston State University, Huntsville, TX, 77341, USA

    Joel W. Walker

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  1. Tianjun Li
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  2. James A. Maxin
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Correspondence to James A. Maxin.

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Li, T., Maxin, J.A., Nanopoulos, D.V. et al. Correlated event excesses in LHC SUSY searches at 7 & 8 TeV: new physics or conspiring noise?. Eur. Phys. J. C 73, 2556 (2013). https://doi.org/10.1140/epjc/s10052-013-2556-x

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