Interpreting the electron EDM constraint

Journal Article · 10 May 2019 · Journal of High Energy Physics (Online)

DOI: https://doi.org/10.1007/jhep05(2019)059 · OSTI ID:1611324

Cesarotti, Cari ^[1]; Lu, Qianshu ^[1]; Nakai, Yuichiro ^[2]; Parikh, Aditya ^[1]; Reece, Matthew  ^[1]

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1. Harvard Univ., Cambridge, MA (United States)
2. Rutgers Univ., Piscataway, NJ (United States)

The ACME collaboration has recently announced a new constraint on the electron EDM, |d_e| < 1.1 × 10^-29e 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” ($$q_{ƒ}\overline{σ}^{μν}\overline{u}_{ƒ}$$)·($$ℓ\overline{σ}_{μν}\overline{e}$$), which in turn generates the EDM through RG evolution. If the QULE operator is generated at tree level, this corresponds to a previously studied leptoquark model. For the first time, we also classify scenarios in which the QULE operator is generated at one loop through a box diagram, which include (among others) SUSY and leptoquark models. The electron EDM bound is the leading constraint on a wide variety of theories of CP-violating new physics interacting with the Higgs boson or the top quark. We argue that any future nonzero measurement of an electron EDM will provide a strong motivation for constructing new colliders at the highest feasible energies.

• Research Organization: Rutgers Univ., Piscataway, NJ (United States); Harvard Univ., Cambridge, MA (United States)
• Sponsoring Organization: USDOE Office of Science (SC); National Science Foundation (NSF)
• Grant/Contract Number: SC0010008; SC0013607; DGE1745303; NNX16AI12G
• OSTI ID: 1611324
• Journal Information: Journal of High Energy Physics (Online), Vol. 2019, Issue 5; ISSN 1029-8479
• Publisher: Springer BerlinCopyright Statement
• Country of Publication: United States
• Language: English