2008/01/22 by A. Bottino, N. Fornengo, G. Polesello +1 · 3 citations
Physics and Astronomy · #Black Holes and Theoretical Physics #Cosmology and Gravitation Theories #Particle physics theoretical and experimental studies #astro-ph #hep-ph
paper · pdf · doi:10.1103/physrevd.77.115026
published as Phys.Rev.D77:115026,2008 · 21 pages, 17 figures
arxiv created 2008/01/22 · openalex publication_date 2008/06/27 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
We study how the properties of the four neutralino states, \ensuremathχi (i=1, 2, 3, 4), can be investigated at the Large Hadron Collider (LHC), in the case when the lightest one, \ensuremathχ1, has a mass m_\ensuremathχ\ensuremath\lesssim50 GeV and is stable. This situation arises naturally in supersymmetric models where gaugino masses are not unified at a grand unified (GUT) scale and R-parity is conserved. The main features of these neutralino states are established by analytical and numerical analyses, and two scenarios are singled out on the basis of the cosmological properties required for the relic neutralinos. Signals expected at LHC are discussed through the main chain processes started by a squark, produced in the initial proton-proton scattering. We motivate the selection of some suitable benchmarks, in light of the spectroscopical properties (mass spectrum and transitions) of the four neutralino states. Branching ratios and the expected total number of events are derived in the various benchmarks, and their relevance for experimental determination of neutralino properties is finally discussed.