Large two-loop contributions to g - 2 from a generic pseudoscalar boson

D. Chang, W. F. Chang, C. H. Chou, W. Y. Keung

Research output: Contribution to journalArticlepeer-review

87 Citations (Scopus)


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 contributions as large as the electroweak contribution which is measurable in the next round of g - 2 experiments. Through the contribution we calculate 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.

Original languageEnglish
Article number091301
Pages (from-to)913011-913014
Number of pages4
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Issue number9
Publication statusPublished - 2001

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)


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