Precision measurement of the total cross section for e/sup +/e/sup -/. -->. hadrons at a center-of-mass energy of 29 GeV

Journal Article · Mon Apr 01 00:00:00 EST 1985 · Phys. Rev. D; (United States)

DOI:https://doi.org/10.1103/PhysRevD.31.1537· OSTI ID:5922883

Fernandez, E; Ford, W T; Qi, N; Read, Jr, A L; Smith, J G; Camporesi, T; De Sangro, R; Marini, A; Peruzzi, I; Piccolo, M; Ronga, F; Blume, H T; Hurst, R B; Sleeman, J C; Venuti, J P; Wald, H B; Weinstein, R; Band, H R; Gettner, M W; Goderre, G P ; Gottschalk, B; Meyer, O A; Moromisato, J H; Shambroom, W D; von Goeler, E; Ash, W W; Chadwick, G B; Clearwater, S H; Coombes, R W; Kaye, H S; Lau, K H; Leedy, R E; Lynch, H L; Messner, R L; Michalowski, S J; Muller, F; Moss, L J; Nelson, H N; Rich, K; Ritson, D M; Rosenberg, L J; Wiser, D E; Zdarko, R W; Groom, D E; Lee, H; Loh, E C; Delfino, M C; Heltsley, B K; Johnson, J R; Lavine, T L; Maruyama, T; Prepost, R

We report a high-precision measurement of the ratio R of the total cross section for e/sup +/e/sup -/..-->..hadrons to that for e/sup +/e/sup -/..--> mu../sup +/..mu../sup -/, 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 ..cap alpha../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.

• Research Organization: Department of Physics, University of Colorado, Boulder, Colorado 80309
• OSTI ID: 5922883
• Journal Information: Phys. Rev. D; (United States), Vol. 31:7
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ELECTRON-POSITRON INTERACTIONS
ANNIHILATION
HADRONS
PARTICLE PRODUCTION
COUPLING CONSTANTS
EXPERIMENTAL DATA
FRAGMENTATION
GEV RANGE 10-100
LUMINOSITY
MUONS
PAIR PRODUCTION
PEP STORAGE RINGS
QUANTUM CHROMODYNAMICS
QUANTUM ELECTRODYNAMICS
QUARKS
TOTAL CROSS SECTIONS
BASIC INTERACTIONS
CROSS SECTIONS
DATA
ELECTRODYNAMICS
ELECTROMAGNETIC INTERACTIONS
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
645102* - High Energy Physics- Particle Interactions & Properties-Experimental- Weak Interactions & Properties
645400 - High Energy Physics- Field Theory