Abstract
We calculate the dominant contributions to the muon at the two-loop level due to a generic pseudoscalar boson that may exist in any exotic Higgs sector in most extensions of the standard model. The leading effect comes from diagrams of the Barr-Zee type. A sufficiently light pseudoscalar Higgs boson can give rise to contributions as large as the electroweak contribution which is measurable in the next round of experiments. Through the contribution we calculate here, the anticipated improved data in the recent future on the muon can put the best limit on the possible existence of a light pseudoscalar boson in physics beyond the standard model.
- Received 11 October 2000
DOI:https://doi.org/10.1103/PhysRevD.63.091301
©2001 American Physical Society