Journal ArticleDOI
Recent Experimental Advances in Positronium Research
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TLDR
Positronium is a two-body, leptonic, particle-antiparticle system which possesses self-annihilation channels not directly present in any system studied to date as discussed by the authors.Abstract:
Positronium is a two-body, leptonic, particle-antiparticle system which possesses self-annihilation channels not directly present in any system studied to date. These features make it ideal for the study of the relativistic, two-body problem in quantum electrodynamics. This review will focus on recent experimental advances in fundamental positronium research. In addition, a less detailed discussion of recent theoretical advances is outlined. The review also contains a fairly detailed historial introduction and a section discussing uses of positronium in research not related to tests of quantum electrodynamics.read more
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Journal ArticleDOI
Effective lagrangians for bound state problems in QED, QCD, and other field theories
William E. Caswell,G. P. Lepage +1 more
TL;DR: A renormalization group strategy for the study of bound states in field theory is developed in this paper, which is completely different from conventional analyses, based upon the Bethe-Salpeter equation, and it is far simpler
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Generating positrons with femtosecond-laser pulses
C. Gahn,George D. Tsakiris,Georg Pretzler,Klaus-Juergen Witte,C Delfin,Claes-Göran Wahlström,Dietrich Habs +6 more
TL;DR: In this article, femtosecond table-top laser system was used to convert low-energy photons into antiparticles, namely positrons, and the average intensity of this source of positrons was estimated to be equivalent to 2×108
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Experimental progress in positronium laser physics
TL;DR: The field of experimental positronium physics has advanced significantly in the last few decades, with new areas of research driven by the development of techniques for trapping and manipulating positrons using Surko-type buffer gas traps as discussed by the authors.
Journal ArticleDOI
Positronium cooling in porous silica measured via Doppler spectroscopy
David Cassidy,Paolo Crivelli,T. H. Hisakado,Laszlo Liszkay,V. E. Meligne,P. Perez,Harry W. K. Tom,Allen P. Mills +7 more
TL;DR: In this paper, the authors measured the kinetic energy of positronium (Ps) atoms emitted into a vacuum from a porous silica film subsequent to positron bombardment, via the Doppler spread of the linewidth of the Ps ${1}^{3}S$-${2}^{ 3}P$ transition.
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Recoil effects in the hyperfine structure of QED bound states
TL;DR: In this paper, the authors give a general discussion of the derivation from field theory of a formalism for the perturbative solution of the relativistic two-body problem, which is obtained by fixing the loop energy in the four-dimensional formalism at a point which is independent of the loop momentum and is symmetric in the two particle variables.