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Measurements of the Cross Section for e+e- -> hadrons at Center-of-Mass Energies from 2 to 5 GeV

J. Z. Bai

TL;DR

Values of R = sigma(e(+e(-)-->hadrons)/sigma( e(+)e (-)-->mu(+)mu(-)) for 85 center-of-mass energies between 2 and 5 GeV measured with the upgraded Beijing Spectrometer at the Beijing Electron-Positron Collider are reported.

Abstract

We report values of $R = σ(e^+e^-\to {hadrons})/σ(e^+e^-\toμ^+μ^-)$ for 85 center-of-mass energies between 2 and 5 GeV measured with the upgraded Beijing Spectrometer at the Beijing Electron-Positron Collider.

Measurements of the Cross Section for e+e- -> hadrons at Center-of-Mass Energies from 2 to 5 GeV

TL;DR

Values of R = sigma(e(+e(-)-->hadrons)/sigma( e(+)e (-)-->mu(+)mu(-)) for 85 center-of-mass energies between 2 and 5 GeV measured with the upgraded Beijing Spectrometer at the Beijing Electron-Positron Collider are reported.

Abstract

We report values of for 85 center-of-mass energies between 2 and 5 GeV measured with the upgraded Beijing Spectrometer at the Beijing Electron-Positron Collider.

Paper Structure

This paper contains 1 equation, 3 figures, 3 tables.

Figures (3)

  • Figure 1: Distributions for $E_{cm}$=3.0 GeV of (a) track momentum; (b) track $\cos \theta$; (c) total energy deposited in the BSC; and (d) event vertex position along the beam ($z$) axis. Histograms and dots in (a)-(c) represent Monte Carlo and real data, respectively; the beam associated background in (c) has been removed by sideband subtraction.
  • Figure 2: (a) The c.m. energy dependence of the detection efficiency for hadronic events estimated using the LUARLW generator. The error bars are the total systematic errors. (b) The calculated radiative correction, and (c) the product of (a) and (b).
  • Figure 3: (a) A compilation of measurements of $R$ in the c.m. energy range from 1.4 to 5 GeV. (b) $R$ values from this experiment in the resonance region between 3.7 and 4.6 GeV.