期刊
EUROPEAN PHYSICAL JOURNAL C
卷 76, 期 5, 页码 -出版社
SPRINGER
DOI: 10.1140/epjc/s10052-016-4076-y
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The 2 Higgs Doublet Model of type III has renormalisable Lepton Flavour-Violating couplings, and its one- and two-loop (Barr-Zee) contributions to mu -> e gamma are known. In the decoupling limit, where the mass scale M of the second doublet is much greater than the electroweak scale, the model can be parametrised with an Effective Field Theory (EFT) containing dimension-six operators. The 1/M-2 terms of the exact calculation are reproduced in the EFT, provided that the four-fermion operator basis below the weak scale is enlarged with respect to the SU(2)-invariant Buchmuller-Wyler list. It is found that the dominant two-loop Barr-Zee contributions arise mostly in two-loop matching and running, and that dimension-eight operators might be numerically relevant.
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