Atoms in flight and the remarkable connections between atomic and hadronic physics
Atomic physics and hadron physics are both based on Yang Mills gauge theory; in fact, quantum electrodynamics can be regarded as the zero-color limit of quantum chromodynamics. I review a number of areas where the techniques of atomic physics provide important insight into the theory of hadrons in QCD. For example, the Dirac-Coulomb equation, which predicts the spectroscopy and structure of hydrogenic atoms, has an analog in hadron physics in the form of light-front relativistic equations of motion which give a remarkable first approximation to the spectroscopy, dynamics, and structure of light hadrons. The renormalization scale for the running coupling, which is unambiguously set in QED, leads to a method for setting the renormalization scale in QCD. The production of atoms in flight provides a method for computing the formation of hadrons at the amplitude level. Conversely, many techniques which have been developed for hadron physics, such as scaling laws, evolution equations, and light-front quantization have equal utility for atomic physics, especially in the relativistic domain. I also present a new perspective for understanding the contributions to the cosmological constant from QED and QCD.
KeywordsQuantum electrodynamics Atomic physics Hadron physics Light-front
Unable to display preview. Download preview PDF.
- 8.Brodsky, S.J., Collins, J.C., Ellis, S.D., Gunion, J.F., Mueller, A.H.: Intrinsic Chevrolets at the SSC. DOE/ER/40048-21 P4, C84/06/23. p. 10. In: Proc. Of Conference: C84-06-23 (1984) (Snowmass Summer Study 1984:0227)Google Scholar
- 11.Brodsky, S.J., de Teramond, G.F.: Light-front holography and QCD hadronization at the amplitude level. SLAC-PUB-13504. Jan 2009. p. 5. In: Proceedings of the 18th International Conference On Particles And Nuclei (PANIC 08). Eilat, Israel, 9–14 Nov 2008 arXiv:0901.0770 [hep-ph] (2009)