Upper bounds on the mass of the lightest neutralino

Details Upper bounds on the mass of the lightest neutralino Upper bounds on the mass of the lightest neutralino

2003-03-31

arxiv.org/abs/hep-ph/0303262v2

Phys.Rev.D67:115009,2003

Physics

High Energy Physics

High Energy Physics - Phenomenology

13 pages, 4 figures, LaTex; added a reference and changed the title and abstract to plural. Version published in PRD

Scientific paper

10.1103/PhysRevD.67.115009

We derive the general upper bounds on the mass of the lightest neutralino, as a function of the gluino mass, in different supersymmetry breaking models with minimal particle content and the standard model gauge group. This includes models with gravity mediated supersymmetry breaking (SUGRA), as well as models with anomaly mediated supersymmetry breaking (AMSB). We include the next-to-leading order corrections in our evaluation of these bounds. We then expand the mass matrix in powers of M_Z/mu, and find the upper bound on the mass of the lightest neutralino from this expansion. By scanning over all of the parameter space, we find that the bound we have obtained can be saturated. We compare the general upper bound on the lightest neutralino mass to the upper bound that is obtained when the radiative electroweak symmetry breaking scenario is assumed.

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