QCD studies and determination of α s in e + e − collisions at and 172 GeV
1997
We present a study of the structure of hadronic events recorded by the L3 detector at LEP at the
centerof
massenergies of 161 and 172 GeV. The data sample corresponds to an integrated luminosity of 21.25 pb −1 collected during the high energy runs of 1996. The distributions of event shape variables and the energy dependence of their mean values are well reproduced by QCD models. From a comparison of the data with resummed O ( α s 2 ) QCD calculations, we determine the strong
coupling constantat the two energies. Combining this with our earlier measurements we find that the strong
coupling constantdecreases with increasing energy as expected in QCD.
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