Scalar scenarios contributing to (g-2)_mu with enhanced Yukawa couplings

Abstract

In this work we address contributions from scalars to (g-2)_\mu. In order to explain the recently measured deviation by the BNL experiment on (g-2)_\mu, it is necessary that these scalars are either light or couple strongly with muons. Here we explore this last possibility. We show that a scalar with mass of the order of 10^2 GeV provides significant contribution to (g-2)_\mu if the Yukawa coupling is about 10^{-1}. We suggest scenarios where this comes about naturally.

Comments: 8 pages, 1 figure, uses macro axodraw.sty, improved text, typos corrected, version to appear in Phys. Rev. D