No-Scale Scenarios in the Light of New Measurement of Muon Anomalous Magnetic Moment

الأصل · EN

Supersymmetric contribution to the muon anomalous magnetic moment aμis discussed in the no-scale-type supersymmetry breaking scenarios. Taking the correlation between the supersymmetric contributions to aμand Br(b→ sγ), it is shown that the precise measurements of these quantities serve an important constraint on the relative sign of the gaugino masses; combining the 2.6-σdeviation in aμfrom the standard-model prediction measured by the E821 experiment and Br(b→ sγ) measured by CLEO, the sign of the product M₂M₃ is strongly preferred to be positive, where M₂ and M₃ are SU(2)ₗ and SU(3)C gaugino mass parameters, respectively. In particular, no-scale-type models with universal gaugino masses are in accord with the two constraints and also with the Higgs mass bound. In addition, it is also shown that future improvements in the measurements of aμand Br(b→ sγ) may provide serious test of the cases with M₂M₃<0.