2020/08/31 by Mariana Frank, Ipsita Saha
Computer Science · Physics and Astronomy · #Anomalous magnetic dipole moment #Computational Physics and Python Applications #Dark Matter and Cosmic Phenomena #Electron #Higgs boson #Lepton #Magnetic moment #Muon #Nuclear physics #Observable #Parameter space #Particle physics #Particle physics theoretical and experimental studies #Physics #Physics beyond the Standard Model #Pseudoscalar #Quantum mechanics #Quark #Standard Model (mathematical formulation) #Two-Higgs-doublet model #hep-ph
paper · pdf · doi:10.1103/physrevd.102.115034
published as Phys. Rev. D 102, 115034 (2020) · 25 pages, 7 captioned figures; v2: version published in PRD
openalex publication_date 2020/12/29 · arxiv created 2021/02/17 · arxiv updated 2021/02/18 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We show that inclusion of a single generation of vectorlike leptons in the two-Higgs doublet Models significantly enlarges the allowed parameter space consistent with the muon anomalous magnetic moment, as well as with other theoretical and experimental constraints. While previously (g\ensuremath-2)_\ensuremathμ could only be resolved in type-X scenario by requiring a light pseudoscalar Higgs boson and large tan\ensuremathβ, contributions of vectorlike leptons via two-loop Barr Zee diagrams broaden the allowed parameter space, allowing tan\ensuremathβ as low as 10 and pseudoscalar masses as large as O(1 TeV), while fulfilling the stringent constraints from precision and flavor observable. Similar results are obtained for type-II scenarios, but there the parameter space is more restricted by flavor observables.