Probing supergravity models with the $b\to s\gamma$ microscope

Abstract

We present a calculation of the branching ratio $\brbsg$ in two well motivated supersymmetric models: the minimal $SU(5)$ and the no-scale flipped $SU(5)$ supergravity models. We find that the improved CLEO upper bound ($\brbsg<5.4\times10^{-4}$ at 95\% CL) does not yet constrain the minimal $SU(5)$ supergravity model, where $\brbsg_{minimal}=(2.3-3.6)\times10^{-4}$. In the flipped $SU(5)$ model the CLEO bound is constraining, although still not very significantly, even for light charged Higgs masses. An improvement in sensitivity by a factor of two will probe all (more than half) of the parameter space of the minimal (flipped) $SU(5)$ supergravity model. This ``resolution" of the $\bsg$ microscope far surpasses that of present collider experiments. In the flipped model there exists a significant region of parameter space where $\brbsg$ is highly suppressed due to a new phenomenon involving a complicated cancellation against the QCD correction parameter.

9 pages, 3 figures (available upon request as uuencoded file or separate ps files), tex (harvmac), CTP-TAMU-16/93

References in corpus (9)

• Predictions in SU(5) Supergravity Grand Unification with Proton Stability and Relic Density Constraints
• Can $b\to s\gamma$ Close the Supersymmetric Higgs Production Window?
• Implications of $b\to s\gamma$ decay measurements in testing the MSSM Higgs sector
• Cosmological Constraints and SU(5) Supergravity Grand Unification
• Aspects of Radiative Electroweak Symmetry Breaking in Supergravity Models
• Proton Decay and Cosmology Strongly Constrain the Minimal SU(5) Supergravity Model
• Improved LEP lower bound on the lightest SUSY Higgs mass from Radiative Electroweak Breaking and its Experimental Consequences
• Troubles with the Minimal SU(5) Supergravity Model
• Proposed Tests for Minimal SU(5) Supergravity at Fermilab, Gran Sasso, SuperKamiokande, and LEP

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