Tests of quantum electrodynamics with two-, three-, and four-photon final states from e/sup +/e/sup -/ annihilation at. sqrt. s = 29 GeV
High-precision measurements of electron-positron annihilation into final states of two, three, and four photons are presented. The data were obtained with the MAC detector at the PEP storage ring of the Stanford Linear Accelerator Center, at a center-of-mass energy of 29 GeV. The measured e/sup +/e/sup -/..--> gamma gamma.. differential cross section is used to test the validity of quantum electrodynamics (QED) in this energy range; it agrees well with QED, and the limit on cutoff parameters for the electron propagator is ..lambda..>66 GeV. The measurement of e/sup +/e/sup -/..--> gamma gamma gamma.. is used to test the QED calculations of order ..cap alpha../sup 3/ and to search for anomalies that would indicate the existence of new particles; the agreement with QED is excellent and no anomalies are found. Two events from the reaction e/sup +/e/sup -/..--> gamma gamma gamma gamma.. are found, in agreement with the QED prediction.
- Research Organization:
- Department of Physics, University of Colorado, Boulder, Colorado 80309
- OSTI ID:
- 5858989
- Journal Information:
- Phys. Rev. D; (United States), Vol. 35:1
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ELECTRON-POSITRON INTERACTIONS
ANNIHILATION
QUANTUM ELECTRODYNAMICS
TESTING
ANGULAR DISTRIBUTION
DIFFERENTIAL CROSS SECTIONS
GEV RANGE 10-100
PEP STORAGE RINGS
PHOTONS
PROPAGATOR
RADIATIVE CORRECTIONS
SCINTILLATION COUNTERS
BASIC INTERACTIONS
CORRECTIONS
CROSS SECTIONS
DISTRIBUTION
ELECTRODYNAMICS
ELECTROMAGNETIC INTERACTIONS
ELEMENTARY PARTICLES
ENERGY RANGE
FIELD THEORIES
GEV RANGE
INTERACTIONS
LEPTON-LEPTON INTERACTIONS
MASSLESS PARTICLES
MEASURING INSTRUMENTS
PARTICLE INTERACTIONS
QUANTUM FIELD THEORY
RADIATION DETECTORS
STORAGE RINGS
645101* - High Energy Physics- Particle Interactions & Properties-Experimental- Electromagnetic Interactions & Properties
645400 - High Energy Physics- Field Theory