Heidelberg 1999 – wissenschaftliches Programm
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T: Teilchenphysik
T 401: QCD 4
T 401.1: Gruppenbericht
Dienstag, 16. März 1999, 16:30–16:55, CH1
Measurement of αs from DiJet Rates in Deep Inelastic Scattering at HERA — •E. Tassi — DESY, Notkestraße 85, 22607 Hamburg
We have studied dijet production at medium and high Q2 in Deep Inelastic Scattering using data collected in the years 1996-97 with the ZEUS detector at HERA. Measured dijet differential cross sections and rates have been compared with NLO QCD calculations [1] [2] for the longitudinally invariant KT algorithm. The dijet rates when fitted to perturbative QCD predictions allow a precise determination of the energy scale dependence of the strong coupling constant.
[1] S.Catani and M.H. Seymour, Nucl.Phys. B485 (1997) 291
[2] D. Graudenz hep-ph/9710244