Light stops in the MSSM parameter space

Understand

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.