Measurement of R and determination of the charged particle multiplicity in e+ e- annihilation at s**(1/2) around 10-GeV

GeV the ratio of the hadronic cross-section to the μ-pair cross section in lowest order QED has been determined to beR=3.46±0.03±0.13. In addition, we have measured the charged-particle multiplicities in non-resonant hadron production at

\sqrt s= 10.47

GeV just below theB

\bar B

threshold and in ϒ (4S) resonance decays. For the average charged-particle multiplicities in continuum events and ϒ(4S)→B

\bar B

decays we obtain cont=8.35±0.02±0.20 and ϒ(4s)=10.81±0.05±0.23.

electron positron: colliding beams
colliding beams: electron positron
electron positron: annihilation
annihilation: electron positron
jet: electroproduction
electroproduction: jet
hadron: multiple production
multiple production: hadron
cross section: hadronic
charged particle: multiplicity

References(13)

Figures(0)

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