Renormalon Phenomena in Jets and Hard Processes

B. R. Webber

doi:10.1016/S0920-5632(98)00325-9

paper

Renormalon Phenomena in Jets and Hard Processes

arXiv:hep-ph/9712236 · doi:10.1016/S0920-5632(98)00325-9

Abstract

The `renormalon' or `dispersive' method for estimating non-perturbative corrections to QCD observables is reviewed. The corrections are power-suppressed, i.e. of the form $A / Q^{p}$ where $Q$ is the hard process momentum scale. The renormalon method exploits the connection between divergences of the QCD perturbation series and low-momentum dynamics to predict the power, $p$ . The further assumption of an approximately universal low-energy effective strong coupling leads to relationships between the coefficients $A$ for different observables. Results on $1/ Q^{2}$ corrections to deep inelastic structure functions and $1/ Q$ corrections to event shapes are presented and compared with experiment. Shape variables that could be free of $1/ Q$ and $\as(Q^2)/Q$ corrections are suggested.

17 pages, LaTeX, 5 figures, uses epsfig. Talk at XXVII International Symposium on Multiparticle Dynamics, Frascati, Italy, 8-12 September 1997

Renormalon Phenomena in Jets and Hard Processes

Abstract

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