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Interpreting the electron EDM constraint

Profile image of Aditya ParikhAditya Parikh

2019, Journal of High Energy Physics

https://doi.org/10.1007/JHEP05(2019)059
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48 pages

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Abstract

The ACME collaboration has recently announced a new constraint on the electron EDM, |d e | < 1.1 × 10−29 e cm, from measurements of the ThO molecule. This is a powerful constraint on CP-violating new physics: even new physics generating the EDM at two loops is constrained at the multi-TeV scale. We interpret the bound in the context of different scenarios for new physics: a general order-of-magnitude analysis for both the electron EDM and the CP-odd electron-nucleon coupling; 1-loop SUSY, probing sleptons above 10 TeV; 2-loop SUSY, probing multi-TeV charginos or stops; and finally, new physics that generates the EDM via the charm quark or top quark Yukawa couplings. In the last scenario, new physics generates a “QULE operator” $$ \left({q}_f{\overline{\sigma}}^{\mu \nu }{\overline{u}}_f\right)\kern0.5em \cdotp \kern0.5em \left(\ell {\overline{\sigma}}_{\mu \nu}\overline{e}\right) $$ q f σ ¯ μ ν u ¯ f · ℓ σ ¯ μ ν e ¯ , which in turn generates the EDM through RG evolution. If the Q...

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