Speaker
Dr
Alexey Gladyshev
(Joint Institute for Nuclear Research)
Description
Specific regions in the MSSM parameter space are analysed. It is shown that in
the narrow band near the co-annihilation region charged sleptons (staus) may
be long-lived particles. This region is consistent with the WMAP restrictions on
the Dark matter and depends on the value of \tan\beta. Due to a relatively
small mass stau production cross-section at LHC may reach a few % pb. In the
other region top squarks become light and even may be the LSP. This happens
when the triple scalar coupling A becomes very big compared to m0 and
negative. We show that in this case the requirement that the LSP is neutral
imposes noticeable constraint on the parameter space 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 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.
Author
Dr
Alexey Gladyshev
(Joint Institute for Nuclear Research)
Co-authors
Prof.
Dmitry Kazakov
(Joint Institute for Nuclear Research)
Mr
Manuel Paucar
(Joint Institute for Nuclear Research)
