A simple way to estimate the value of 
Nevzorov R. B., Novikov A. V.,. Vysotsky M. I
To obtain the value of the electromagnetic coupling constant at q2 = m\, a, which plays the key role in electroweak physics, we must integrate the cross section of e + e"-annihilation into hadrons divided by {s-m\) over s from the threshold to infinity. By combining, for each flavor channel, the contribution of the lowest resonance with the perturbative QCD continuum, we obtain 1/ά=128.89±0.06. This value is close to the known result which was obtained with purely experimental inputs, 1/ά=128.87±0.12. © 1994 American Institute of Physics.
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![](/ps/1348/article_20360_800_head.png "To obtain the value of the electromagnetic coupling constant at <i>q<sup>2</sup> = m\, a, </i>which plays the key role in electroweak physics, we must integrate the cross section of <i>e <sup>+</sup> e</i>"-annihilation into hadrons divided by <i>{s-m\) </i>over s from the threshold to infinity. By combining, for each flavor channel, the contribution of the lowest resonance with the perturbative QCD continuum, we obtain 1/ά=128.89±0.06. This value is close to the known result which was obtained with purely experimental inputs, 1/ά=128.87±0.12. © <i>1994 American Institute of Physics.</i>")