Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1996-07-11
Phys.Lett.B388:97-105,1996
Physics
High Energy Physics
High Energy Physics - Phenomenology
22 pages. one Latex file + nine eps figures
Scientific paper
10.1016/0370-2693(96)01130-6
We discuss the lower limit on the mass of the neutralino $\chi$ that can be obtained by combining data from $e^+e^-$ annihilation at LEP and elsewhere with astrophysical and theoretical considerations. Loopholes in the purely experimental analysis of ALEPH data from the Z peak and LEP 1.5, which appear when $\mu<0$ for certain values of the sneutrino mass $m_{\tilde\nu}$ and the ratio $\tan\beta$ of supersymmetric Higgs vacuum expectation values, may be largely or totally excluded by data from lower-energy $e^+e^-$ data, the hypothesis that most of the cosmological dark matter consists of $\chi$ particles, and the assumption that electroweak symmetry breaking is triggered by radiative corrections due to a heavy top quark. The combination of these inputs imposes $m_{\chi} \ge 21.4~\gev$, if soft supersymmetry-breaking masses are assumed to be universal at the grand-unification scale.
Ellis John
Falk Toby
Olive Keith
Schmitt Michael
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