2007/04/11 by A. V. Gladyshev, Gladyshev, A. V., D. I. Kazakov +3
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #hep-ph
paper · pdf · doi:10.48550/arxiv.0704.1429
10 pages, 10 eps figures
arxiv created 2007/04/11 · arxiv updated 2009/12/01
We consider the regions of the MSSM parameter space where the top squarks become light and even may be the LSP. This happens when the triple scalar coupling A becomes very big compared to m0. We show that in this case the requirement that the LSP is neutral imposes noticeable constraint on the parameter space excluding low m0 and m1/2 similar to constraint from the Higgs mass limit. In some cases these constraints overlap. This picture takes place in a wide region of tanβ. In a narrow band close to the border line the stops are long-lived particles and decay into quarks and neutralino (chargino). The cross-section of their production at LHC via gluon fusion mechanism in this region may reach a few pb.