Renormalon phenomena in jets and hard processes

✍ Scribed by B.R. Webber

• Publisher: Elsevier Science
• Year: 1999
• Tongue: English
• Weight: 739 KB
• Volume: 71
• Category: Article
• ISSN: 0920-5632
• DOI: 10.1016/s0920-5632(98)00325-9

✦ Synopsis

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 v 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 lowenergy 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(Q2)/Q corrections are suggested.