Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1992-09-29
Nucl.Phys.B392:83-110,1993
Physics
High Energy Physics
High Energy Physics - Phenomenology
24 Pages, OUTP-92-10P
Scientific paper
10.1016/0550-3213(93)90198-X
The cosmological significance of the neutralino sector is studied for a class of models in which electroweak symmetry breaking is seeded by a gauge singlet. Extensive use is made of the renormalisation group equations to significantly reduce the parameter space, by deriving analytic expressions for all the supersymmetry-breaking couplings in terms of the universal gaugino mass $m_{1/2}$, the universal scalar mass $m_0$ and the coupling $A$. The composition of the LSP is determined exactly below the W mass, no approximations are made for sfermion masses, and all particle exchanges are considered in calculating the annihilation cross-section; the relic abundance is then obtained by an analytic approximation. We find that in these models, stable neutralinos may make a significant contribution to the dark matter in the universe.
Abel Steven A.
Sarkar Sourav
Whittingham Ian B.
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