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A Simple way to estimate the value of alpha identical to alpha (m(Z)**2

May 30, 1994
6 pages
Published in:
  • JETP Lett. 60 (1994) 399-403
e-Print:
Report number:
  • FTUV-94-27,
  • IFIC-94-25
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Abstract:
To obtain the value of electromagnetic coupling constant at q 2=m 2Zq~2=m~2_Z, αˉ\bar{\alpha}, which plays a key role in electroweak physics one has to integrate the cross-section of e +e −e~+e~--annihilation into hadrons divided by (s−m 2Z)(s-m~2_Z) over ss from threshold to infinity. By combining, for each flavor channel, the contribution of lowest resonance with the perturbative QCD continuum, we obtain 1/αˉ=128.90±0.061/\bar{\alpha} = 128.90\pm 0.06 a result which is close to known result obtained with purely experimental inputs, i.e. 1/αˉ=128.87±0.121/\bar{\alpha} = 128.87\pm 0.12.
  • coupling constant: electromagnetic interaction
  • electromagnetic interaction: coupling constant
  • electron positron: annihilation
  • annihilation: electron positron
  • hadron: electroproduction
  • electroproduction: hadron
  • cross section: hadronic
  • model: parton
  • meson: electroproduction
  • electroproduction: meson