The Lamb shift contribution of very light millicharged particles

Details The Lamb shift contribution of very light millicharged particles The Lamb shift contribution of very light millicharged particles

2007-03-13

arxiv.org/abs/hep-ph/0703140v3

Phys.Rev.D76:091701,2007

Physics

High Energy Physics

High Energy Physics - Phenomenology

10 pages including 3 figures, version to appear in Physical Review D (Rapid Communications)

Scientific paper

10.1103/PhysRevD.76.091701

The leading order vacuum polarization contribution of very light millicharged fermions and scalar (spin-0) particles with charge \epsilon e and mass \mu to the Lamb shift of the hydrogen atom is shown to imply universal, i.e. \mu-independent, upper bounds on \epsilon: \epsilon \lsim 10^{-4} for \mu \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.

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