Analyzes factorization scale prescriptions for QED ISR corrections in e+e- annihilation in LL and NLL approximations and optimizes them via comparison to known two-loop results.
Renormalization scale uncertainty in tne DIS 2+1 jet cross-section
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abstract
The deep inelastic scattering 2+1 jet cross- section is a useful observable for precision tests of QCD, e.g. measuring the strong coupling constant alpha(s). A consistent analysis requires a good understanding of the theoretical uncertainties and one of the most fundamental ones in QCD is due to the renormalization scheme and scale ambiguity. Different methods, which have been proposed to resolve the scale ambiguity, are applied to the 2+1 jet cross-section and the uncertainty is estimated. It is shown that the uncertainty can be made smaller by choosing the jet definition in a suitable way.
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Optimization of factorization scale in QED Drell-Yan-like processes
Analyzes factorization scale prescriptions for QED ISR corrections in e+e- annihilation in LL and NLL approximations and optimizes them via comparison to known two-loop results.