Vanishing or non-vanishing rainbow? Reduction formulas of electric dipole moment
نویسندگان
چکیده
In this paper, we derive a simplified formula of electric dipole moments (EDMs) fermion. the Standard Model, it is well-known that non-trivial cancellations between some rainbow-type diagrams induced by $W$ boson exchanges occur in calculation neutron EDM at two-loop level due to gauge symmetry. The fermion self-energy and vertex correction are related through Ward-Takahashi identity, relation causes exact cancellation EDM. We formulas for more general setup introducing form factors so derived can be applicable larger class models. conclude non-zero contributions from with chirality flipping effects internal fermions. also discuss other possible generalization which classes
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ژورنال
عنوان ژورنال: Journal of High Energy Physics
سال: 2021
ISSN: ['1127-2236', '1126-6708', '1029-8479']
DOI: https://doi.org/10.1007/jhep10(2021)237