Predictive signatures of supersymmetry: Measuring the dark matter mass and gluino mass with early LHC data

2011/02/13 by Daniel Feldman, Katherine Freese, Pran Nath +3 · 37 citations
Physics and Astronomy · #Black Holes and Theoretical Physics #CMB cold spot #Cosmic microwave background #Cosmology and Gravitation Theories #Dark matter #Gauge (firearms) #Gaugino #Gluino #Higgs boson #Large Hadron Collider #Neutralino #Nuclear physics #Particle physics #Particle physics theoretical and experimental studies #Physics #Standard Model (mathematical formulation) #Supersymmetry #astro-ph.HE #hep-ph

paper · pdf · doi:10.1103/physrevd.84.015007

published in Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D. Particles and fields 84(1) (American Physical Society)

arxiv created 2011/02/13 · openalex publication_date 2011/07/13 · arxiv updated 2011/07/28 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05

Abstract

We present a focused study of a predictive unified model whose measurable consequences are immediately relevant to early discovery prospects of supersymmetry at the LHC. ATLAS and CMS have released their analysis with 35 pb^\ensuremath-1 of data and the model class we discuss is consistent with this data. It is shown that with an increase in luminosity, the LSP dark matter mass and the gluino mass can be inferred from simple observables such as kinematic edges in leptonic channels and peak values in effective mass distributions. Specifically, we consider cases in which the neutralino is of low mass and where the relic density consistent with WMAP observations arises via the exchange of Higgs bosons in unified supergravity models. The magnitudes of the gaugino masses are sharply limited to focused regions of the parameter space, and, in particular, the dark matter mass lies in the range \ensuremath∼(50--65) GeV with an upper bound on the gluino mass of 575 GeV, with a typical mass of 450 GeV. We find that all model points in this paradigm are discoverable at the LHC at √(s)=7 TeV. We determine lower bounds on the entire sparticle spectrum in this model based on existing experimental constraints. In addition, we find the spin-independent cross section for neutralino scattering on nucleons to be generally in the range of \ensuremathσ_\stackrel\texttildelow\ensuremathχ₁⁰p^SI=10^\ensuremath-46\ifmmode±\else\textpm\fi1 cm² with much higher cross sections also possible. Thus, direct detection experiments such as CDMS and XENON already constrain some of the allowed parameter space of the low mass gaugino models and further data will provide important cross-checks of the model assumptions in the near future.

Citations

• Search for Supersymmetry inpp¯Collisions ats=1.96 TeVUsing the Trilepton Signature for Chargino-Neutralino Production
• Supersymmetric Higgs and radiative electroweak breaking
• Trilepton signal of grand unified models at the Tevatron
• Decoding the mechanism for the origin of dark matter in the early universe using LHC data
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• Supersymmetry without prejudice
• Supergravity and superstring signatures of the one-parameter model at LHC
• SDECAY: a Fortran code for the decays of the supersymmetric particles in the MSSM
• NLSP gluino search at the Tevatron and early LHC
• Regularization dependence of running couplings in softly broken supersymmetry
• How to Look for Supersymmetry under the LHC Lamppost
• Nearly degenerate gauginos and dark matter at the LHC
• Three‐YearWilkinson Microwave Anisotropy Probe(WMAP) Observations: Implications for Cosmology
• Review of Particle Physics
• Search for the Standard Model Higgs boson at LEP

Cited by

• Higgs boson mass, proton decay, naturalness, and constraints of the LHC and Planck data