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IFAE 2006 pp 141-144 | Cite as

Resummations in QCD: recent developments

  • Andrea Banfi

Abstract

There are processes which involve two widely separated scales Q and Q 0, where Q is a hard scale, and real emissions characterised by momentum scales larger than Q 0 are not measured, so that only their virtual counterpart contributes to physical observables. Since both real and virtual corrections are infrared and collinear (IRC) divergent, but their sum is finite, incomplete real-virtual cancellations give rise to large logarithms L = lnQ/Q 0 in perturbative (PT) expansions, which spoil their convergence.

Keywords

Transverse Momentum Soft Function Momentum Scale Virtual Correction Real Emission 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag Italia 2007

Authors and Affiliations

  • Andrea Banfi
    • 1
  1. 1.Università degli Studi di Milano Bicocca and INFNSezione di MilanoItaly

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