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hep-ph/0102122. The hadronic uncertainties may be underestimated (see also F.J. Ynduráin, hep-ph/0102312, and S. Narison, private com- munication
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The recent measurement of the muon anomalous magnetic moment a μ shows a 2.6 σ deviation from the standard model value. We show that it puts strong constraints on the parameter space of the two-Higgs-doublet model (2HDM) II. The dominant contribution of the Higgs bosons comes at the two-loop level, and in order to explain the data it favors a pseudoscalar A with a light mass range and a large tan β . At 95% C.L., the upper limit for m A is 29 (55) (85) GeV for tan β = 30 (45) (60), and tan β is bounded below at 17. This is in sharp contrast to the conclusion one draws from considering one-loop Higgs contributions alone. Finally, we also discuss the role of the Higgs contributions in the minimal supersymmetric standard model.
Physical Review D – American Physical Society (APS)
Published: Dec 1, 2001
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