Updated Bounds on Milli-Charged Particles

Abstract

We update the bounds on fermions with electric charge $\epsilon e$ and mass $m_{\epsilon }$. For $m_ε\lsim m_e$ we find $10^{-15}\lsimε<1$ is excluded by laboratory experiments, astrophysics and cosmology. For larger masses, the limits are less restrictive and depend on $m_{\epsilon }$. For milli-charged neutrinos, the limits are stronger, especially if the different flavors mix as suggested by current experimental evidence.

15 pages, 1 figure, minor changes, matches version to be published in JHEP

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