Bound on the anomalous tbW coupling from two-loop contribution to neutron electric dipole moment

2007/08/10 by Ana A. Avilez-López, A. Avilez-Lopez, H. Novales–Sánchez +3
Mathematics · Physics and Astronomy · #Atomic and Subatomic Physics Research #Atomic physics #Coupling (piping) #Dark Matter and Cosmic Phenomena #Dipole #Electric dipole moment #Loop (graph theory) #Materials science #Mathematics #Moment (physics) #Neutron #Neutron electric dipole moment #Nuclear physics #Physics #Quantum electrodynamics #Quantum mechanics #Quantum, superfluid, helium dynamics #hep-ph

paper · pdf · doi:10.1016/j.physletb.2007.08.012

published as Phys.Lett.B653:241-248,2007 · 13 pages, 3 figures

openalex publication_date 2007/08/10 · arxiv created 2007/08/13 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05

Abstract

The two-loop contribution to the electric dipole moment (EDM) and the chromo electric dipole moment (CEDM) of an arbitrary fermion f induced by the most general renormalizable tbW coupling with complex left- and right-handed components (a_L and a_R) is calculated. The analytical expressions are numerically evaluated and the current experimental constraints on the electron, neutron and mercury atom EDMs are used to obtain a bound on the complex phase Im(a^*_La_R). It is found that the most stringent constraint, Im(a^*_La_R)<2.33 X 10^-2, arises from the neutron EDM.

Citations

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