Measurement of R in $e^+ e^-$ Annihilation for $\sqrt{s}$ Between 7.4-{GeV} and 9.4-{GeV}

The rationR=σ(e+e−→hadrons)/σ(e+e−→ µ+ µ−) was measured with the LENA detector at DORIS in a scan between 7.40 and 7.48 GeV and between 8.67 and 9.43 GeV center of mass energies. Corrected for QED radiative effects,R is found to be constant with an average value ofR=3.37 ±0.06stat±0.23syst. No narrow resonances withΓee(Γhad/Γtot)⊗0.30 keV (95% C.L.) and no steps have been observed. Based on this value ofR, revised values for υ(1S) resonance parameters are presented.

ELECTRON POSITRON: COLLIDING BEAMS
COLLIDING BEAMS: ELECTRON POSITRON
ELECTRON POSITRON: ANNIHILATION
ANNIHILATION: ELECTRON POSITRON
HADRON: ELECTROPRODUCTION
ELECTROPRODUCTION: HADRON
TOTAL CROSS SECTION: RATIO
RATIO: TOTAL CROSS SECTION
TOTAL CROSS SECTION: ENERGY DEPENDENCE
ENERGY DEPENDENCE: TOTAL CROSS SECTION

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Measurement of R in e+e−e^+ e^-e+e− Annihilation for s\sqrt{s}s​ Between 7.4-{GeV} and 9.4-{GeV}

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Measurement of R in $e^+ e^-$ Annihilation for $\sqrt{s}$ Between 7.4-{GeV} and 9.4-{GeV}