Results on photon-mediated dark-matter–nucleus interactions from the PICO-60 <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">C</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub><mml:msub><mml:mrow><mml:mi mathvariant="normal">F</mml:mi></mml:mrow><mml:mrow><mml:mn>8</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math> bubble chamber

Many compelling models predict dark matter coupling to the electromagnetic current through higher multipole interactions, while remaining electrically neutral. Different couplings have been studied, among them anapole moment, electric and magnetic dipole moments, millicharge. This study sets limits on for these photon-mediated interactions using non-relativistic contact operators in an effective field theory framework. Using data from PICO-60 bubble chamber leading masses between 2.7 GeV/c$^2$ 24 are reported of matter-nucleus interactions. The detector was filled with 52 kg C$_3$F$_8$ operating at thermodynamic thresholds 2.45 keV 3.29 keV, reaching exposures 1404 kg-day 1167 kg-day, respectively.