Large Two-Loop Contributions to g-2 from a Generic Pseudoscalar Boson

Details Large Two-Loop Contributions to g-2 from a Generic Pseudoscalar Boson Large Two-Loop Contributions to g-2 from a Generic Pseudoscalar Boson

2000-09-26

arxiv.org/abs/hep-ph/0009292v3

Phys.Rev.D63:091301,2001

Physics

High Energy Physics

High Energy Physics - Phenomenology

added analysis based on E821 result g-2 result (Feb. 2001)

Scientific paper

10.1103/PhysRevD.63.091301

We calculate the dominant contributions to the muon $g-2$ 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 contribution as large as the electroweak contribution which is measurable in the next round of $g-2$ experiment. Through the contribution we calculated here, the anticipated improved data in the recent future on the muon $g-2$ can put the best limit on the possible existence of a light pseudoscalar boson in physics beyond the standard model.

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