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The measurement of alpha(s) from event shapes with the DELPHI detector at the highest LEP energies.

Research output: Contribution to journalJournal article


Journal publication date09/2004
JournalEuropean Physical Journal C: Particles and Fields
Number of pages23
Original languageEnglish


Hadronic event shape distributions are determined from data in e + e - collisions between 183 and 207 GeV. From these the strong coupling is extracted in , NLLA and matched + NLLA theory. Hadronisation corrections evaluated with fragmentation model generators as well as an analytical power ansatz are applied. Comparing these measurements to those obtained at and around M Z allows a combined measurement of from all DELPHI data and a test of the energy dependence of the strong coupling.