Article ID Journal Published Year Pages File Type
1850155 Physics Letters B 2016 7 Pages PDF
Abstract

We consider implications of the diphoton excess recently observed at the LHC on the anomalous magnetic dipole moment of the muon (g−2)μ=2aμ(g−2)μ=2aμ, hypothesizing that the possible 750 GeV resonance is a (pseudo)scalar particle ϕ(∼). The ϕ(∼)-γ-γ   interaction implied by the diphoton events might generically contribute to aμaμ via 2-loop Barr-Zee type diagrams in a broad class of models. If ϕ(∼) is an SU(2)LSU(2)L singlet, the new contribution to aμaμ is much smaller than the current anomaly, Δaμ≡aμexp−aμSM≈(30±10)×10−10, since the scalar can complete the Barr-Zee diagrams only through its mixing with the Standard Model Higgs boson. If ϕ(∼) belongs to an SU(2)LSU(2)L doublet in an extended Higgs sector, then by contrast, ΔaμΔaμ can be easily accommodated with the aid of an enhanced Yukawa coupling of ϕ(∼) to the muon such as in the Type-II or -X two Higgs doublet model.

Related Topics
Physical Sciences and Engineering Physics and Astronomy Nuclear and High Energy Physics
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