Two-loop corrections to the decay rate of parapositronium

Journal Article · Mon Sep 01 04:00:00 EDT 2003 · Physical Review. A

DOI:https://doi.org/10.1103/PhysRevA.68.032512· OSTI ID:20640174

Adkins, Gregory S; McGovern, Nathan M; Fell, Richard N; Sapirstein, J ^[1]

---

1. Franklin and Marshall College, Lancaster, Pennsylvania 17604, USA (United States)

Order-{alpha}{sup 2} corrections to the decay rate of parapositronium are calculated. A QED scattering calculation of the amplitude for electron-positron annihilation into two photons at threshold is combined with the technique of effective field theory to determine a nonrelativistic QED Hamiltonian, which is then used in a bound-state calculation to determine the decay rate. Our result for the two-loop correction is 5.124 3(33) in units of ({alpha}/{pi}){sup 2} times the lowest-order rate. This is consistent with but more precise than the result 5.1(3) of a previous calculation.

• OSTI ID: 20640174
• Journal Information: Physical Review. A, Journal Name: Physical Review. A Journal Issue: 3 Vol. 68; ISSN 1050-2947; ISSN PLRAAN
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
74 ATOMIC AND MOLECULAR PHYSICS
AMPLITUDES
ANNIHILATION
BOUND STATE
CORRECTIONS
DECAY
ELECTRON-POSITRON INTERACTIONS
HAMILTONIANS
PHOTONS
POSITRONIUM
POSITRONS
QUANTUM ELECTRODYNAMICS
RENORMALIZATION
SCATTERING