Published April 1, 1985 | Version v1
Journal article Metadata-only

Precision measurement of the total cross section for e+e-→hadrons at a center-of-mass energy of 29 GeV

Creators

  • 1. Department of Physics, University of Colorado, Boulder, Colorado 80309

Description

We report a high-precision measurement of the ratio R of the total cross section for e+e-→hadrons to that for e+e-→μ+μ-, at a center-of-mass energy of 29.0 GeV using the MAC detector. The result is R = 3.96 +- 0.09. This value of R is used to determine a value of the strong coupling constant α/sub s/ of 0.23 +- 0.06, nearly independent of fragmentation models. Two different analysis methods having quite different event-selection criteria have been used and the results are in agreement. Particular attention has been given to the study of systematic errors. New higher-order QED calculations are used for the luminosity determination and the acceptance for hadrons

Additional details

Publishing Information

Journal Title
Phys. Rev., D
Journal Volume
31
Journal Issue
7
Series
Phys. Rev., D.
Journal Page Range
1537-1556
ISSN
0556-2821

INIS

Country of Publication
United States
Country of Input or Organization
United States
INIS RN
16066406
Subject category
S72: PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; S71: CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS;
Resource subtype / Literary indicator
Numerical Data
Descriptors DEI
ANNIHILATION; COUPLING CONSTANTS; ELECTRON-POSITRON INTERACTIONS; EXPERIMENTAL DATA; GEV RANGE 10-100; HADRONS; LUMINOSITY; MECHANICAL FRAGMENTATION; MUONS; PAIR PRODUCTION; PARTICLE PRODUCTION; PEP STORAGE RINGS; QUANTUM CHROMODYNAMICS; QUANTUM ELECTRODYNAMICS; QUARKS; TOTAL CROSS SECTIONS
Descriptors DEC
CROSS SECTIONS; DATA; ELECTRODYNAMICS; ELEMENTARY PARTICLES; ENERGY RANGE; FERMIONS; FIELD THEORIES; GEV RANGE; INFORMATION; INTERACTIONS; LEPTON-LEPTON INTERACTIONS; LEPTONS; NUMERICAL DATA; OPTICAL PROPERTIES; PARTICLE INTERACTIONS; PHYSICAL PROPERTIES; POSTULATED PARTICLES; QUANTUM FIELD THEORY; STORAGE RINGS