/ Phenomenology-HEP arXiv:0704.1429


Light stops in the MSSM parameter space


Gladyshev, A.V. (Moscow, ITEP) ; Kazakov, D.I. (Moscow, ITEP) ; Paucar, M.G. (Dubna, JINR)

Pages: 10

Abstract: 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 m_0. We show that in this case the requirement that the LSP is neutral imposes noticeable constraint on the parameter space excluding low m_0 and m_{1/2} similar to constraint from the Higgs mass limit. In some cases these constraints overlap. This picture takes place in a wide region of \tan\beta. 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.

Keyword(s): Supersymmetry ; long-lived particles

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 Record created 2010-10-29, last modified 2014-01-30



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