Precision-Measurement Of The Total Cross-Section For E+E--]Hadrons At A Center-Of-Mass Energy Of 29 Gev
PHYSICAL REVIEW D（1985）
摘要
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 αs 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.Received 7 November 1984DOI:https://doi.org/10.1103/PhysRevD.31.1537©1985 American Physical Society
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关键词
quantum chromodynamics,systematic error,muons,pair production,fermions,elementary particles,information,fragmentation,luminosity,quantum electrodynamics,interactions,physical properties,quantum field theory,coupling constants,field theory,leptons,electrodynamics,center of mass,cross section,data,hadrons,quarks,annihilation,coupling constant,higher order
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