Lamb shift contribution of very light charged particles
نویسندگان
چکیده
منابع مشابه
The Lamb shift contribution of very light milli–charged fermions
The leading order vacuum polarization contribution of very light milli–charged fermions with charge εe and mass μ to the Lamb shift of the hydrogen atom is shown to imply a universal, i.e. μ–independent, upper bound on ε : ε < ∼ 10 for μ < ∼ 1 keV. This is in contrast to expectations based on the commonly used approximation to the Uehling potential.
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The leading order vacuum polarization contribution of very light millicharged fermions and scalar (spin–0) particles with charge εe and mass μ to the Lamb shift of the hydrogen atom is shown to imply universal, i.e. μ–independent, upper bounds on ε : ε < ∼ 10 for μ < ∼ 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 ba...
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I advance arguments against the view that the Lee-Nauenberg-Kinoshita theorem is relevant in practice to the scattering of charged particles as their mass tends to zero. I also discuss the case of massive coloured particle scattering. Scattering cross-sections for reactions involving, in the initial state, a charged particle of mass m contain (in perturbation theory) ln m terms, which become la...
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The radiative correction to the Lamb shift of order α(Zα)m induced by the light by light scattering insertion in external photons is obtained. The new contribution turns out to be equal to −0.122(2)α(Zα)/(πn)(mr/m) m. Combining this contribution with our previous results we obtain the complete correction of order α(Zα)m induced by all diagrams with closed electron loops. This correction is 37.3...
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ژورنال
عنوان ژورنال: Physical Review D
سال: 2007
ISSN: 1550-7998,1550-2368
DOI: 10.1103/physrevd.76.091701