The Lamb shift contribution of very light millicharged particles
arXiv:hep-ph/0703140 · doi:10.1103/PhysRevD.76.091701
Abstract
The leading order vacuum polarization contribution of very light millicharged fermions and scalar (spin-0) particles with charge εe and mass μto the Lamb shift of the hydrogen atom is shown to imply universal, i.e. μ-independent, upper bounds on ε: ε\lsim 10^{-4} for μ\lsim 1 keV in the case of fermions, and for scalars this bound is increased by a factor of 2. This is in contrast to expectations based on the commonly used approximation to the Uehling potential relevant only for conventionally large fermion (and scalar) masses.
10 pages including 3 figures, version to appear in Physical Review D (Rapid Communications)
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