Power suppressed corrections to hadronic event shapes
نویسندگان
چکیده
منابع مشابه
Power Suppressed Corrections to Hadronic Event Shapes
For high energy processes (M ≫ ΛQCD) there are infrared safe hadronic shape variables that have a calculable perturbative expansion in αs(M ). However, nonperturbative power suppressed corrections to these variables are not well understood. We use the behavior of large orders of the perturbation expansion to gain insight into the nonperturbative corrections. Our results suggest that certain sha...
متن کاملEstimation of Power Corrections to Hadronic Event Shapes
Power corrections to hadronic event shapes are estimated using a recently suggested relationship between perturbative and nonperturbative effects in QCD. The infrared cutoff dependence of perturbative calculations is related to non-perturbative contributions with the same dependence on the energy scale Q. Corrections proportional to 1/Q are predicted, in agreement with experiment. An empirical ...
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Recent work on the theme of power corrections in perturbative QCD is briefly reviewed, with an emphasis on event shapes in e+e− annihilation. The factorization of soft gluon effects is the main tool: it leads to resummation, and thus highlights the limitations of perturbation theory, pointing to nonperturbative corrections whose size can be estimated. Power corrections can be resummed into shap...
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We compute power corrections to mean values of hadronic event shapes — the thrust and the C parameter — of tagged b quark events in electron positron annihilation, using the dispersive approach. We find that the leading power corrections are of the same type of 1/Q corrections as for event shapes in the massless case, with the same non-perturbative coefficient times a perturbatively calculable ...
متن کاملPower Corrections to e + e − Dijet Event Shapes ⋆
We discuss a class of event shapes for ee dijet events that include the thrust as a special case. Large logarithmic corrections to the corresponding cross sections can be resummed to all logarithmic orders at leading power. However, irrespective of the order up to which the perturbative expansion is calculated, it has to be supplemented by nonperturbative corrections due to its at best asymptot...
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ژورنال
عنوان ژورنال: Physics Letters B
سال: 1995
ISSN: 0370-2693
DOI: 10.1016/0370-2693(94)01504-6