Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2001-04-05
Phys.Rev. D64 (2001) 115018
Physics
High Energy Physics
High Energy Physics - Phenomenology
8 pages, RevTex file, 5 figures, published version Phys. Rev. D 54 (2001) 115018
Scientific paper
10.1103/PhysRevD.64.115018
The muon anomalous magnetic moment is investigated in the standard model with two Higgs doublets (S2HDM) motivated from spontaneous CP violation. Thus all the effective Yukawa couplings become complex. As a consequence of the non-zero phase in the couplings, the one loop contribution from the neutral scalar bosons could be positive and negative relying on the CP phases. The interference between one and two loop diagrams can be constructive in a large parameter space of CP-phases. This will result in a significant contribution to muon anomalous magnetic moment even in the flavor conserving process with a heavy neutral scalar boson ($m_h \sim$ 200 GeV) once the effective muon Yukawa coupling is large ($|\xi_\mu|\sim 50$). In general, the one loop contributions from lepton flavor changing scalar interactions become more important. In particular, when all contributions are positive in a reasonable parameter space of CP phases, the recently reported 2.6 sigma experiment vs. theory deviation can be easily explained even for a heavy scalar boson with a relative small Yukawa coupling in the S2HDM.
Wu Yue-Liang
Zhou Yu-Feng
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