Sensitivity of EDM experiments in paramagnetic atoms and molecules to hadronic CP violation

Flambaum, V. V.; Pospelov, M.; Ritz, A.; Stadnik, Y. V.

doi:10.1103/physrevd.102.035001

Sensitivity of EDM experiments in paramagnetic atoms and molecules to hadronic CP violation

Journal Article · Tue Aug 04 00:00:00 EDT 2020 · Physical Review. D.

DOI:https://doi.org/10.1103/physrevd.102.035001· OSTI ID:1837586

Flambaum, V. V. ^[1]; Pospelov, M. ^[2]; ^[3]; ^[4]

Univ. of New South Wales, Sydney, NSW (Australia); University of Minnesota
Univ. of Minnesota, Minneapolis, MN (United States); Perimeter Inst. for Theoretical Physics, Waterloo, ON (Canada)
Univ. of Victoria, BC (Canada)
Univ. of New South Wales, Sydney, NSW (Australia); Johannes Gutenberg Univ., Mainz (Germany); Univ. of Tokyo, Chiba (Japan)

Experiments searching for the electric dipole moment (EDM) of the electron d_e utilize atomic/molecular states with one or more uncompensated electron spins, and these paramagnetic systems have recently achieved remarkable sensitivity to d_e. If the source of CP violation resides entirely in the hadronic sector, the two-photon exchange processes between electrons and the nucleus induce CP-odd semileptonic interactions, parametrised by the Wilson coefficient C_SP, and provide the dominant source of EDMs in paramagnetic systems instead of d_e. We evaluate the C_SP coefficients induced by the leading hadronic sources of CP violation, namely nucleon EDMs and CP-odd pion-nucleon couplings, by calculating the nucleon-number-enhanced CP-odd nuclear scalar polarisability, employing chiral perturbation theory at the nucleon level and the Fermi-gas model for the nucleus. This allows us to translate the ACME EDM limits from paramagnetic ThO into novel independent constraints on the QCD theta term |$$\bar θ$$| < 3 × 10^–8, proton EDM |d_p| < 2 × 10^–23 e cm, isoscalar CP-odd pion-nucleon coupling |$$\bar g$$$$^{(1)}_{πNN}$$| < 4 × 10^–10, and color EDMs of quarks |$$\tilde d$$ _u-$$\tilde $$d _d| < 2 × 10^–24 cm. We note that further experimental progress with EDM experiments in paramagnetic systems may allow them to rival the sensitivity of EDM experiments with neutrons and diamagnetic atoms to these quantities.

View Accepted Manuscript (DOE)

Research Organization:: Univ. of Minnesota, Minneapolis, MN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), High Energy Physics (HEP)

Grant/Contract Number:: SC0011842

OSTI ID:: 1837586

Journal Information:: Physical Review. D., Journal Name: Physical Review. D. Journal Issue: 3 Vol. 102; ISSN 2470-0010

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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