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Constraining SUSY Scenarios Using Simplified Models

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Book cover Constraining Supersymmetric Models

Part of the book series: Springer Theses ((Springer Theses))

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Abstract

The experimental results of direct SUSY searches are typically presented as limits in simplified versions of the full SUSY models, with only a few parameters. The reinterpretation of the results in the context of other models is in principle possible, however time-consuming and computationally very intensive. This chapter presents a new computer tool, called Fastlim, which facilitates and speeds up the calculation of limits on the parameter space of new physics models form direct LHC searches. We explain in detail how the program works. Further we present a first application of Fastlim, where we study the constraints from LHC searches for SUSY particles on the parameter space of natural SUSY models, a class of SUSY models where the particles closely tied to the Higgs boson mass are relatively light, while the rest of the particle spectrum is assumed to be beyond the reach of the LHC.

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Notes

  1. 1.

    There is a program, called ATOM [22], which takes an event file as input and evaluates the efficiencies, for a set of well-validated analyses, taking detector effects into account. A similar program is CheckMate [23]. For our work we make use of the ATOM framework, as we will explain below.

  2. 2.

    In certain cases, topologies with more than three SUSY particles may be approximated by two or three dimensional topologies, as will be described in Sect. 8.3.3.

  3. 3.

    Here we make use of the code PySLHA [24] to extract the masses and branching ratios from the SLHA file.

  4. 4.

    We do not consider the SUSY particle decays into three or more SUSY particles.

  5. 5.

    A possibility to take deviations in Higgs branching ratios from the SM values into account can be included in future Fastlim releases.

  6. 6.

    This is in principle possible, however many SUSY models require a large splitting in the stop sector in order to predict a realistic value for the Higgs boson mass.

  7. 7.

    In the cases where no cut-flow tables were available, we validated our implementations by checking two independent implementations or by comparing to the simplified model exclusion plots.

  8. 8.

    Throughout this section we set: \(M_1=M_2=M_{{Q,D,U}_{12}}=M_{D_3}=3000\,\text { GeV},\,\,X_b=X_t\).

  9. 9.

    Here (and more generally in the discussion of the plots in this section) the exclusion refers to the \(95\,\%\) CL exclusion given by the analysis that is most sensitive in that region.

  10. 10.

    Radiative electroweak symmetry breaking was briefly discussed in Sect. 2.2.10. In this formula the running of the soft masses is neglected.

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  1. University of Amsterdam, Amsterdam, The Netherlands

    Lisa Zeune

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  1. Lisa Zeune
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Zeune, L. (2016). Constraining SUSY Scenarios Using Simplified Models. In: Constraining Supersymmetric Models . Springer Theses. Springer, Cham. https://doi.org/10.1007/978-3-319-22228-8_8

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