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Title: Corrections beyond the leading order in π{sup 0} → e{sup +}e{sup −} process

We briefly summarize experimental and theoretical results on the rare decay π{sup 0} → e{sup +}e{sup −}. Two-loop QED corrections are reviewed and the bremsstrahlung contribution beyond the soft-photon approximation is analytically calculated. Using the leading logarithm approximation, the possible contribution of QCD corrections is estimated. The complete result can be used to fit the value of the contact interaction coupling χ{sup (r)} to the recent KTeV experiment with the result χ{sup (r)}(M{sub ρ}) = 4.5±1.0.
Authors:
; ;  [1]
  1. Institute of Particle and Nuclear Physics, Faculty of Mathematics and Physics, Charles University, Prague (Czech Republic)
Publication Date:
OSTI Identifier:
22499036
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 1701; Journal Issue: 1; Conference: 11. conference on quark confinement and hadron spectrum, Saint Petersburg (Russian Federation), 8-12 Sep 2014; Other Information: (c) 2016 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; APPROXIMATIONS; BREMSSTRAHLUNG; CORRECTIONS; COUPLING; DECAY; PHOTONS; POSITRON-POSITRON INTERACTIONS; POSITRONS; QUANTUM CHROMODYNAMICS; QUANTUM ELECTRODYNAMICS