Natural MSSM after the LHC 8 TeV run

2013/07/31 by Kamila Kowalska, Enrico Maria Sessolo · 41 citations
Physics and Astronomy · #Chargino #Cosmology and Gravitation Theories #Dark Matter and Cosmic Phenomena #Electroweak interaction #Gluino #Higgs boson #Large Hadron Collider #Lepton #Minimal Supersymmetric Standard Model #Neutralino #Nuclear physics #Parameter space #Particle physics #Particle physics theoretical and experimental studies #Physics #Supersymmetry #hep-ph

paper · pdf · doi:10.1103/physrevd.88.075001

published in Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D. Particles and fields 88(7) (American Physical Society) · 34 pages, 11 figures. Discussion and plots formerly in the (mQL,mtR) plane now recast in terms of (Msusy,Xt/Msusy). Version published in PRD

arxiv created 2013/09/25 · openalex publication_date 2013/10/01 · arxiv updated 2013/10/09 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05

Abstract

We investigate the impact of direct LHC supersymmetry searches on the parameter space of three natural scenarios in the MSSM. In the first case the spectrum consists of light top squarks, sbottoms, and Higgsino-like neutralinos, while the other particles are assumed to be out of experimental reach. In the second case we consider an additional light gluino. Finally we study a more complex spectrum comprising also light sleptons, a winolike chargino, and a binolike neutralino. We simulate in detail three LHC searches: top squark production at ATLAS with 20.7/fb, CMS 11.7/fb inclusive search for squarks and gluinos with the variable \ensuremathα_T, and CMS 9.2/fb electroweak production with three leptons in the final state. For each point in our scans we calculate the exclusion likelihood due to the individual searches and to their statistical combination. We calculate the fine-tuning measure of the points allowed by the LHC and the implications for the Higgs mass and other phenomenological observables: Higgs signal rates, the relic density, BR(B_s\ensuremath→\ensuremathμ⁺\ensuremathμ^\ensuremath-), BR(B\ensuremath→X_s\ensuremathγ), and the spin-independent neutralino-proton scattering cross section. We find that points with acceptable levels of fine-tuning are for the most part already excluded by the LHC and including the other constraints further reduces the overall naturalness of our scenarios.

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