Large two-loop contributions tog−2from a generic pseudoscalar boson

Darwin Chang, We-Fu Chang, Chung-Hsien Chou, Wai-Yee Keung
2001 Physical Review D, Particles and fields  
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
more » ... ed 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.
doi:10.1103/physrevd.63.091301 fatcat:ugx4x3i65jfzpmznuxaynhl3pu