VIII International Conference "Models in Quantum Field Theory"

$\mathcal{T}$, $\mathcal{P}$-odd electron-nucleon interaction via a Higgs-boson exchange

Oct 10, 2025, 5:00 PM

20m

Room 1, 1st floor

Session talk Section B: Quantum field theory methods in elementary particle physics Section B: Quantum field theory methods in elementary particle physics

Speaker

Dmitry Chubukov

Description

The search for $\mathcal{T}$- and $\mathcal{P}$-violating interactions, where $\mathcal{T}$ denotes time-reversal symmetry, and $\mathcal{P}$ denotes spatial parity, has been a central focus in fundamental physics for the past 75 years. Despite substantial progress in improving experimental limits on these interactions, theoretical predictions, even within the Standard Model (SM), remain highly uncertain.

This report examines various mechanisms responsible for $\mathcal{T}$- and $\mathcal{P}$-odd interactions. Notably, the electron electric dipole moment ($e$EDM), which violates both $\mathcal{T}$ and $\mathcal{P}$ symmetries, arises in the SM only at the four-loop level at the quark-gluon scale. Taking into account the Glashow-Iliopoulos-Maiani (GIM) mechanism, estimates of $e$EDM range from $10^{-44}$ to $10^{-50}$ $e\text{cm}$ [1–3]. At the hadronic level, the $e$EDM can arise at the one-loop level, with an estimated magnitude around $10^{-39}$$e \text{cm}$ [2].

In atomic systems, $\mathcal{T}$, $\mathcal{P}$-odd effects may also manifest as pseudoscalar-scalar electron-nucleon interactions. In our work, we initially proposed [4], and subsequently developed and evaluated taking into account the GIM mechanism [3], $\mathcal{T}$,~$\mathcal{P}$-odd exchange of the Higgs boson between the electron and the nucleus. The estimate derived in [3], recalculated in terms of an equivalent eEDM, yields a value $10^{-48}$$e \text{cm}$.

The literature contains various other models addressing $\mathcal{T}$- and $\mathcal{P}$-odd electron-nucleon interactions. The largest equivalent EDM reported to date, on the order of $10^{-35}$$e \text{cm}$, has been reported in [5], where the $\mathcal{T}$,~$\mathcal{P}$-odd exchange of $K$ mesons between electrons and nucleons was analyzed at the hadronic scale.

This work was supported by the Russian Science Foundation grant 24-72-10060.

References:

1. Pospelov M. and Ritz A. // Phys. Rev. D 89, 056006 (2014).

2. Yamaguchi Y. and Yamanaka N. // Phys. Rev. D 103, 013001 (2021).

3. Chubukov D.V. and Aleksandrov I.A. // Phys. Rev. D 111, 073011 (2025).

4. Chubukov D.V. and Labzowsky L.N. // Phys. Rev. A 93, 062503 (2016).

5. Ema Y., Gao T., and Pospelov M. // Phys. Rev. Lett. 129, 231801 (2022).

Presentation materials

Chubukov_mqft_2025.pdf