Mearsurement of $α_s$ and the $β$ function with the DELPHI detector at LEP

Oliver Passon

doi:10.1016/S0920-5632(03)01815-2

paper

Mearsurement of $α_{s}$ and the $β$ function with the DELPHI detector at LEP

arXiv:hep-ph/0309023 · doi:10.1016/S0920-5632(03)01815-2

Abstract

Event shape distributions in $e^{+} e^{-}$ annihilation are determined from the DELPHI data taken between 183 and 207\gev. From these the strong coupling $α_{s}$ is extracted with several techniques. Together with the results from other LEP2 energies and at about $m_{Z}$ this allows both, a combined measurement of $α_{s}$ and a test of the scale dependence of the strong interaction. Alternatively the renormalisation group invariant (RGI) perturbation theory is applied to measure the $β$ function of strong interaction. The results are good agreement with the QCD expectation and allow to exclude the existence of light gluinos with a mass below 30\gev in a model independent way.

Talk presented at the QCD02 conference, Montpellier 2002

Mearsurement of αs​ and the β function with the DELPHI detector at LEP

Abstract

Mearsurement of $α_{s}$ and the $β$ function with the DELPHI detector at LEP