publication . Article . Other literature type . Preprint . 2015

explaining the proton radius puzzle with disformal scalars

Brax, Philippe; Burrage, Clare;
Open Access
  • Published: 11 Feb 2015 Journal: Physical Review D, volume 91 (issn: 1550-7998, eissn: 1550-2368, Copyright policy)
  • Publisher: American Physical Society (APS)
  • Country: Italy
We analyse the consequences of a disformal interaction between a massless scalar and matter particles in the context of atomic physics. We focus on the displacement of the atomic energy levels that it induces, and in particular the change in the Lamb shift between the 2s and 2p states. We find that the correction to the Lamb shift depends on the mass of the fermion orbiting around the nucleus, implying a larger effect for muonic atoms. Taking the cut-off scale describing the effective scalar field theory close to the QCD scale, we find that the disformal interaction can account for the observed difference in the proton radius of muonic versus electronic Hydrogen...
arXiv: Physics::Atomic Physics
free text keywords: Proton, Physics, Particle physics, Scalar (physics), Scalar field, Scalar (mathematics), Quantum chromodynamics, Scalar field theory, Quantum electrodynamics, Lamb shift, Massless particle, High Energy Physics - Phenomenology, Astrophysics - Cosmology and Nongalactic Astrophysics, High Energy Physics - Theory
Funded by
  • Funder: European Commission (EC)
  • Project Code: 289442
  • Funding stream: FP7 | SP3 | PEOPLE
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