Published December 1979 | Version v1
Journal article Metadata-only

Tests of quantum chromodynamics and a direct measurement of the strong coupling constant αsub(s) AT √s = 30 GeV

Creators

  • 1. Chinese Academy of Science, Peking. Inst. of High Energy Physics
  • 2. Nationaal Instituut voor Kernfysica en Hoge-Energiefysica (NIKHEF), Amsterdam (Netherlands). Sectie H
  • 3. Massachusetts Inst. of Tech., Cambridge (USA). Lab. for Nuclear Science
  • 4. Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany, F.R.)
  • 5. Technische Hochschule Aachen (Germany, F.R.). Lehrstuhl fuer Experimentalphysik 3B und 3. Physikalisches Inst.

Description

We report the measurement of the reaction e+ + e- → hadronic jets at a center-of-mass energy √s = 30 GeV using the MARK-J detector at PETRA. By measuring the energy and angular distribution of both neutrals and charged particles we were able to isolate unambiguously the three-jet events in a kinematic region where the backgrounds from q anti q and phase space contributions and other processes are small. Various comparisons of the data with quantum chromodynamics were made. The relative yield of three-jet events and the shape distribution of the events enable us to determine αsub(s) = 0.23 +- 0.02 (statistical error) with a systematic error of +- 0.04. (orig.)

Additional details

Publishing Information

Journal Title
Phys. Lett., B
Journal Volume
89
Journal Issue
1
Series
Phys. Lett., B.
Journal Page Range
139-144
ISSN
0370-2693

INIS

Country of Publication
Netherlands
Country of Input or Organization
Netherlands
INIS RN
11519758
Subject category
S72: PHYSICS OF ELEMENTARY PARTICLES AND FIELDS;
Resource subtype / Literary indicator
Numerical Data
Descriptors DEI
ANGULAR DISTRIBUTION; ANNIHILATION; CHARGED PARTICLES; COUPLING CONSTANTS; ELECTRON-POSITRON INTERACTIONS; ENERGY SPECTRA; EXPERIMENTAL DATA; GEV RANGE 10-100; GRAPHS; HADRONS; ISOLATED VALUES; JET MODEL; NEUTRAL PARTICLES; QUANTUM CHROMODYNAMICS
Descriptors DEC
DATA; DATA FORMS; DISTRIBUTION; ELEMENTARY PARTICLES; ENERGY RANGE; FIELD THEORIES; GEV RANGE; INFORMATION; INTERACTIONS; LEPTON-LEPTON INTERACTIONS; MATHEMATICAL MODELS; NUMERICAL DATA; PARTICLE INTERACTIONS; PARTICLE MODELS; QUANTUM FIELD THEORY; SPECTRA