The strongest experimental constraints on SU(5)xU(1) supergravity models

Abstract

We consider a class of well motivated string-inspired flipped $SU(5)$ supergravity models which include four supersymmetry breaking scenarios: no-scale, strict no-scale, dilaton, and special dilaton, such that only three parameters are needed to describe all new phenomena $(m_t,\tan \beta ,m_{\tilde{g}})$. We show that the LEP precise measurements of the electroweak parameters in the form of the ${\epsilon }_1$ variable, and the CLEOII allowed range for $\bsg$ are at present the most important experimental constraints on this class of models. For $m_t\gsim155\,(165)\GeV$, the ${\epsilon }_1$ constraint (at 90(95)\%CL) requires the presence of light charginos ($m_{χ^\pm_1}\lsim50-100\GeV$ depending on $m_t$). Since all sparticle masses are proportional to $m_{\tilde{g}}$, $m_{χ^\pm_1}\lsim100\GeV$ implies: $m_{χ^0_1}\lsim55\GeV$, $m_{χ^0_2}\lsim100\GeV$, $m_{\tilde g}\lsim360\GeV$, $m_{\tilde q}\lsim350\,(365)\GeV$, $m_{\tilde e_R}\lsim80\,(125)\GeV$, $m_{\tilde e_L}\lsim120\,(155)\GeV$, and $m_{\tildeν}\lsim100\,(140)\GeV$ in the no-scale (dilaton) flipped $SU(5)$ supergravity model. The $\bsg$ constraint excludes a significant fraction of the otherwise allowed region in the $(m_{{\chi }_1^{\pm }},\tan \beta )$ plane (irrespective of the magnitude of the chargino mass), while future experimental improvements will result in decisive tests of these models. In light of the ${\epsilon }_1$ constraint, we conclude that the outlook for chargino and selectron detection at LEPII and at HERA is quite favorable in this class of models.

CTP-TAMU-40/93, Latex, 13 pages, 10 figures (available as uuencoded 0.963MB file from [email protected])

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