Constraining CP violating nucleon-nucleon long range interactions in diatomic eEDM searches

Abstract

The searches for CP violating effects in diatomic molecules, such as ${\text{HfF}}^{+}$ and ThO, are typically interpreted as a probe of the electron's electric dipole moment ($e\text{EDM}$), a new electron-nucleon interaction, and a new electron-electron interaction. However, in the case of a nonvanishing nuclear spin, a new CP violating nucleon-nucleon long range force will also affect the measurement. Here, we use the ${\text{HfF}}^{+}$ $e\text{EDM}$ search and derive a new bound on this hypothetical interaction, which is the most stringent from terrestrial experiments in the 1 eV-10 keV mass range. These multiple new physics sources motivate independent searches in different molecular species for CP violation at low energy that result in model independent bounds, which are insensitive to cancellation among them.

arXiv comment9 pages, 4 figures; v2: updated bound, added citation, conclusions unchanged, matched to published version

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• Spin-dependent exotic interactions
• Leading bounds on micro- to picometer fifth forces from neutron star cooling
• Axion Window on New Macroscopic Forces