Jet Production at Low and High Q² and Determination of the Strong Coupling αₛ at H1
Kogler, Roman
Original · EN
Two recent measurements of inclusive jet, 2-jet and 3-jet cross sections in deep-inelastic ep scattering from the H1 collaboration are presented. The measurements are performed at low 5<Q²<100 GeV² and high 150<Q²<15000 GeV² virtualities of the exchanged boson. The obtained cross sections are in good agreement with perturbative QCD calculations at NLO and are used to extract the strong coupling αₛ(MZ). The experimental precision is 0.6% and 1.2% for the high and low Q² regimes, respectively. The error on the obtained value of αₛ(MZ) is dominated by the theoretical uncertainties which are mostly due to missing higher orders. At low Q² the uncertainty due to terms beyond NLO amounts to 7.5%. The determination of αₛ at various scales shows the running of the strong coupling over a large range.
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