Likelihood analysis of the pMSSM11 in light of LHC 13-TeV data |
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| Authors: | E Bagnaschi K Sakurai M Borsato O Buchmueller M Citron J C Costa A De Roeck M J Dolan J R Ellis H Flächer S Heinemeyer M Lucio D Martínez Santos K A Olive A Richards V C Spanos I Suárez Fernández G Weiglein |
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| Institution: | 1.DESY,Hamburg,Germany;2.Faculty of Physics, Institute of Theoretical Physics,University of Warsaw,Warsaw,Poland;3.Instituto Galego de Física de Altas Enerxías,Universidade de Santiago de Compostela,Santiago de Compostela,Spain;4.High Energy Physics Group, Blackett Laboratory,Imperial College,London,UK;5.Experimental Physics Department,CERN,Geneva 23,Switzerland;6.Antwerp University,Wilrijk,Belgium;7.ARC Centre of Excellence for Particle Physics at the Terascale, School of Physics,University of Melbourne,Melbourne,Australia;8.Theoretical Particle Physics and Cosmology Group, Department of Physics,King’s College London,London,UK;9.National Institute of Chemical Physics and Biophysics,Tallinn,Estonia;10.Theoretical Physics Department,CERN,Geneva 23,Switzerland;11.H.H. Wills Physics Laboratory,University of Bristol,Bristol,UK;12.Campus of International Excellence UAM+CSIC, Cantoblanco,Madrid,Spain;13.Instituto de Física Teórica UAM-CSIC,Madrid,Spain;14.Instituto de Física de Cantabria (CSIC-UC),Santander,Spain;15.William I. Fine Theoretical Physics Institute, School of Physics and Astronomy,University of Minnesota,Minneapolis,USA;16.Section of Nuclear and Particle Physics, Department of Physics,National and Kapodistrian University of Athens,Athens,Greece |
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| Abstract: | We use MasterCode to perform a frequentist analysis of the constraints on a phenomenological MSSM model with 11 parameters, the pMSSM11, including constraints from \(\sim 36\)/fb of LHC data at 13 TeV and PICO, XENON1T and PandaX-II searches for dark matter scattering, as well as previous accelerator and astrophysical measurements, presenting fits both with and without the \((g-2)_\mu \) constraint. The pMSSM11 is specified by the following parameters: 3 gaugino masses \(M_{1,2,3}\), a common mass for the first-and second-generation squarks \(m_{\tilde{q}}\) and a distinct third-generation squark mass \(m_{\tilde{q}_3}\), a common mass for the first-and second-generation sleptons \(m_{\tilde{\ell }}\) and a distinct third-generation slepton mass \(m_{\tilde{\tau }}\), a common trilinear mixing parameter A, the Higgs mixing parameter \(\mu \), the pseudoscalar Higgs mass \(M_A\) and \(\tan \beta \). In the fit including \((g-2)_\mu \), a Bino-like \(\tilde{\chi }^0_{1}\) is preferred, whereas a Higgsino-like \(\tilde{\chi }^0_{1}\) is mildly favoured when the \((g-2)_\mu \) constraint is dropped. We identify the mechanisms that operate in different regions of the pMSSM11 parameter space to bring the relic density of the lightest neutralino, \(\tilde{\chi }^0_{1}\), into the range indicated by cosmological data. In the fit including \((g-2)_\mu \), coannihilations with \(\tilde{\chi }^0_{2}\) and the Wino-like \(\tilde{\chi }^\pm _{1}\) or with nearly-degenerate first- and second-generation sleptons are active, whereas coannihilations with the \(\tilde{\chi }^0_{2}\) and the Higgsino-like \(\tilde{\chi }^\pm _{1}\) or with first- and second-generation squarks may be important when the \((g-2)_\mu \) constraint is dropped. In the two cases, we present \(\chi ^2\) functions in two-dimensional mass planes as well as their one-dimensional profile projections and best-fit spectra. Prospects remain for discovering strongly-interacting sparticles at the LHC, in both the scenarios with and without the \((g-2)_\mu \) constraint, as well as for discovering electroweakly-interacting sparticles at a future linear \(e^+ e^-\) collider such as the ILC or CLIC. |
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