Abstract
The pMSSM provides a broad perspective on SUSY phenomenology. In this paper we generate two new, very large, sets of pMSSM models with sparticle masses extending up to 4 TeV, where the lightest supersymmetric particle (LSP) is either a neutralino or gravitino. The existence of a gravitino LSP necessitates a detailed study of its cosmological effects and we find that Big Bang Nucleosynthesis places strong constraints on this scenario. Both sets are subjected to a global set of theoretical, observational and experimental constraints resulting in a sample of ∼225k viable models for each LSP type. The characteristics of these two model sets are briefly compared. We confront the neutralino LSP model set with searches for SUSY at the 7 TeV LHC using both the missing (MET) and non-missing E T ATLAS analyses. In the MET case, we employ Monte Carlo estimates of the ratios of the SM backgrounds at 7 and 8 TeV to rescale the 7 TeV data-driven ATLAS backgrounds to 8 TeV. This allows us to determine the pMSSM parameter space coverage for this collision energy. We find that an integrated luminosity of ∼5–20 fb−1 at 8 TeV would yield a substantial increase in this coverage compared to that at 7 TeV and can probe roughly half of the model set. If the pMSSM is not discovered during the 8 TeV run, then our model set will be essentially void of gluinos and lightest first and second generation squarks that are ≲700–800 GeV, which is much less than the analogous mSUGRA bound. Finally, we demonstrate that non-MET SUSY searches continue to play an important role in exploring the pMSSM parameter space. These two pMSSM model sets can be used as the basis for investigations for years to come.
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Notes
Note that the analysis in [102] indicates that no qualitative changes in the constraints occur for the energy range relevant to our model set.
The lower bound on the \(\tilde{\chi}_{1}^{0}\) mass from collider and other data is approximately 7 GeV [34].
Inclusion of the \(t\bar{t} + 2\) jets background is not expected to alter our results. We have checked this explicitly for the case of the jets + MET analysis, and expect that it will hold for the other analyses as well.
Very recently, ATLAS, CMS AND LHCb have presented a combined upper limit on the B s →μ + μ − branching fraction of 4.2×10−9 at the 95 % CL [131]. This new bound would exclude 6035 (7147) models within our neutralino (gravitino) model set.
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Acknowledgements
The authors are grateful to John Conway for providing an updated version of PGS, and for discussions with J. Conley, R. Cotta, T. Eifert, J. Gainer, M.P. Le, and T. Plehn. S.H.’s work was supported in part by the National Science Foundation, grant NSF-PHY-0705682 (the LHC Theory Initiative). This research used the Open Science Grid production infrastructure [135].
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Cahill-Rowley, M.W., Hewett, J.L., Hoeche, S. et al. The new look pMSSM with neutralino and gravitino LSPs. Eur. Phys. J. C 72, 2156 (2012). https://doi.org/10.1140/epjc/s10052-012-2156-1
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DOI: https://doi.org/10.1140/epjc/s10052-012-2156-1