Abstract
We analyze the impact of data from the full Run 1 of the LHC at 7 and 8 TeV on the CMSSM with mu > 0 and <0 and the NUHM1 with mu > 0, incorporating the constraints imposed by other experiments such as precision electroweak measurements, flavour measurements, the cosmological density of cold dark matter and the direct search for the scattering of dark matter particles in the LUX experiment. We use the following results from the LHC experiments: ATLAS searches for events with {E!!/}_{T} accompanied by jets with the full 7 and 8 TeV data, the ATLAS and CMS measurements of the mass of the Higgs boson, the CMS searches for heavy neutral Higgs bosons and a combination of the LHCb and CMS measurements of mathrm{BR}(B_s rightarrow mu ^+mu ^-) and mathrm{BR}(B_d rightarrow mu ^+mu ^-). Our results are based on samplings of the parameter spaces of the CMSSM for both mu >0 and mu <0 and of the NUHM1 for mu > 0 with 6.8times 10^6, 6.2times 10^6 and 1.6times 10^7 points, respectively, obtained using the MultiNest tool. The impact of the Higgs-mass constraint is assessed using FeynHiggs 2.10.0, which provides an improved prediction for the masses of the MSSM Higgs bosons in the region of heavy squark masses. It yields in general larger values of M_h than previous versions of FeynHiggs, reducing the pressure on the CMSSM and NUHM1. We find that the global chi ^2 functions for the supersymmetric models vary slowly over most of the parameter spaces allowed by the Higgs-mass and the {E!!/}_{T} searches, with best-fit values that are comparable to the chi ^2/mathrm{dof} for the best Standard Model fit. We provide 95 % CL lower limits on the masses of various sparticles and assess the prospects for observing them during Run 2 of the LHC.
Highlights
In addition to establishing the mechanism for electroweak symmetry breaking, one of the primary objectives of experiments at the LHC has been to search for possible physics beyond the Standard Model (SM), such as new particles that might alleviate the naturalness problem and/or be associated with cosmological dark matter
We find that the global χ 2 function varies relatively little across most of the regions of the (m0, m1/2) planes that are allowed by the E/T, Higgs and dark matter density constraints on the CMSSM and NUHM1 parameter spaces, with a global minimum at large m0 and m1/2, which is similar to the χ 2/dof for the SM
We present the results of our new CMSSM fit using the above new inputs, considering first the case of μ > 0 and the case of μ < 0
Summary
In addition to establishing the mechanism for electroweak symmetry breaking, one of the primary objectives of experiments at the LHC has been to search for possible physics beyond the Standard Model (SM), such as new particles that might alleviate the naturalness problem and/or be associated with cosmological dark matter. Prior to the LHC start-up, the discrepancy between the experimental measurement of (g − 2)μ [34,35] and theoretical calculations (see [36,37] and references therein), favoured relatively light sparticle masses, but these have not appeared in ATLAS and CMS E/T searches, disfavouring small values of the CMSSM or NUHM1 SUSY-breaking mass parameters [5]. In this paper we update our analyses to include the 8-TeV ATLAS 20/fb jets + E/T data set [5], providing a complete study of the implications of the LHC Run 1 for the CMSSM and NUHM1 scenarios.
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