Experimental constraint on quark electric dipole moments

Abstract

The electric dipole moments (EDMs) of nucleons are sensitive probes of additional $\mathcal{C}\mathcal{P}$ violation sources beyond the standard model to account for the baryon number asymmetry of the universe. As a fundamental quantity of the nucleon structure, tensor charge is also a bridge that relates nucleon EDMs to quark EDMs. With a combination of nucleon EDM measurements and tensor charge extractions, we investigate the experimental constraint on quark EDMs, and its sensitivity to $\mathcal{C}\mathcal{P}$ violation sources from new physics beyond the electroweak scale. We obtain the current limits on quark EDMs as $1.27\times 10^{-24}e\cdot \mathrm{cm}$ for the up quark and $1.17\times 10^{-24}e\cdot \mathrm{cm}$ for the down quark at the scale of $4\mathrm{Ge}{\mathrm{V}}^2$. We also study the impact of future nucleon EDM and tensor charge measurements, and show that upcoming new experiments will improve the constraint on quark EDMs by about three orders of magnitude leading to a much more sensitive probe of new physics models.

8 pages, 3 figures

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• Nucleon Energy Correlators as a Probe of Light-Quark Dipole Operators at the Electron-Ion Collider
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