Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1997-07-23
Phys.Lett. B416 (1998) 345-352
Physics
High Energy Physics
High Energy Physics - Phenomenology
14 pages, Latex, 4 eps and 1 ps figure, needs epsfig.sty. Minor changes, new references added. To be published in Phys. Lett.
Scientific paper
10.1016/S0370-2693(97)01259-8
The MSSM predictions at the one-loop level for the weak-magnetic dipole moments of the $\tau$ lepton and the $b$ quark are analysed. The entire supersymmetric parameter space is scannedwith the usual GUT constraint and common squark and slepton mass parameters. The real part of $a^W_\tau$ is dominated by the chargino contribution, being the same order as the SM one or even larger in the high $\tan\beta$ region whereas the imaginary part, due to Higgs boson diagrams, is negligible comparedto the SM value. The real part of$a^W_b$ is controlled mainly by charginos andalso by gluinos, when the mixing in the bottom squark sector is large, to yield, for high $\tan\beta$, a contribution one order of magnitude largerthan the pure electroweak SM value but a factor five smaller than the standard QCD contribution. The imaginary part of $a^W_b$ is the same order as in the SM.
Hollik Wolfgang
Illana Jose Ignacio
Rigolin Stefano
Stöckinger Dominik
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