Model independent evaluation of the Wilson coefficient of the Weinberg operator in QCD

• Main Authors: Tomohiro Abe, Junji Hisano, Ryo Nagai
• Format: Article
• Language: English
• Published: SpringerOpen 2018-03-01
• Series: Journal of High Energy Physics
• Subjects: Beyond Standard Model; CP violation
• Online Access: http://link.springer.com/article/10.1007/JHEP03(2018)175

Abstract We derive a Wilson coefficient of a CP-violating purely gluonic dimension-6 operator called the Weinberg operator G G G ∼ $$ \left(GG\overset{\sim }{G}\right) $$ generated by a scalar and two fermions at the two-loop level. We do not specify the representation of SU(3) c for the scalar and the fermions, and thus our result can be applied to a variety of models beyond the standard model. We estimate the nucleon EDMs induced by the Weinberg operator in some examples and discuss the importance of measuring EDMs. It is found that future measurements of the EDMs can probe physics at higher energy scale beyond the reach of collider experiments.