Millicharged cosmic rays and low recoil detectors

@article{Harnik2020MillichargedCR,
  title={Millicharged cosmic rays and low recoil detectors},
  author={Roni Harnik and Ryan Plestid and Maxim Pospelov and Harikrishnan Ramani},
  journal={arXiv: High Energy Physics - Phenomenology},
  year={2020}
}
We consider the production of a "fast flux" of hypothetical millicharged particles (mCPs) in the interstellar medium (ISM). We consider two possible sources induced by cosmic rays: (a) $pp\rightarrow$(meson)$\rightarrow$(mCP) which adds to atmospheric production of mCPs, and (b) cosmic-ray up-scattering on a millicharged component of dark matter. We notice that the galactic magnetic fields retain mCPs for a long time, leading to an enhancement of the fast flux by many orders of magnitude. In… 
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