A simple way to estimate the value of  ( m2Z)
Nevzorov R.B., Novikov A.V., Vysotsky M.I.
То obtain the value of electromagnetic coupling constant at q "mz, d, which plays a key role in electro weak physics one has to integrate the cross-section of e+e~-annihilation into hadrons divided by (s — m^) over s from threshold to infinity. By combining, for each flavor channel, the contribution of lowest resonance with the pcrturbative QCD continuum, we obtain 1 /a 128.89 ± 0.06 a result which is close to known result obtained with purely experimental inputs, i.e. 1/a — 128.87 ± 0.12.
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![](/ps/340/article_5367_800_head.png "То obtain the value of electromagnetic coupling constant at <b><i>q </i></b>"m<sub>z</sub>, d, which plays a key role in electro weak physics one has to integrate the cross-section of e+e~-annihilation into hadrons divided by <b><i>(s — </i></b>m^) over <b><i>s </i></b>from threshold to infinity. By combining, for each flavor channel, the contribution of lowest resonance with the pcrturbative QCD continuum, we obtain 1 <b><i>/a </i></b>128.89 ± 0.06 a result which is close to known result obtained with purely experimental inputs, i.e. 1/a — 128.87 ± 0.12.")