Abstract

During 1995 and 1996 LEP operated at an energy range from 130 to 172 GeV, allowing to continue to test QCD using the same experimental facilities and data analysis developped during the LEP 1 phase. This paper, describes the α, measurements at high energy, performed by LEP collaborations using the event shape analysis. These new precise determinations of the strong coupling constant allow us to study the α s , running from 91 to 172 GeV.

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