Muon anomalous magnetic dipole moment in supersymmetric theories

Abstract

We study the muon anomalous magnetic dipole moment in supersymmetric\ntheories. The impact of the recent Brookhaven E821 experimental measurement on\nboth model-independent and model-dependent supersymmetric parameter spaces is\ndiscussed in detail. We find that values of tan\\beta as low as 3 can be\nobtained while remaining within the E821 one-sigma bound. This requires a light\nsmuon; however, we show that, somewhat surprisingly, no model-independent bound\ncan be placed on the mass of the lightest chargino for any tan\\beta greater\nthan or equal to 3. We also show that the maximum contributions to the\nanomalous magnetic moment are insensitive to CP-violating phases. We provide\nanalyses of the supersymmetric contribution to the muon anomalous magnetic\nmoment in dilaton-dominated supergravity models and gauge-mediated\nsupersymmetry-breaking models. Finally, we discuss how other phenomena, such as\n$B(b\\to s\\gamma)$, relic abundance of the lightest superpartner, and the Higgs\nmass may be correlated with the anomalous magnetic moment, but do not\nsignificantly impact the viability of a supersymmetric explanation, or the mass\nlimits obtainable on smuons and charginos.\n