Perturbative QCD of hard and soft processes

Abstract

We discuss some problems concerning the application of perturbative QCD to high energy processes. In particular for hard processes, we analyze higher order and higher twist corrections. It is argued that these effects are of great importance for understanding the behaviour of pion electromagnetic form factor at moderately large momentum transfers. For soft processes, we show that summing the contributions of the lowest twist operators leads to a Regge-like amplitude.

Reproduction of unpublished JINR Report E2-80-521, Dubna 1980. 22 pages 9 figures. To be published in Modern Physics Letters A. Style file is included

Cited by in corpus (15)

• Universal Interface of TAUOLA Technical and Physics Documentation
• Light Cone Sum Rules for the pi0-gamma*-gamma Form Factor Revisited
• Transition form factors ${\gamma }^{\ast }\gamma \to \eta$ and ${\gamma }^{\ast }\gamma \to {\eta }^{\prime }$ in QCD
• Generalized Parton Distributions and Their Singularities
• ${\eta }_c$ Elastic and Transition Form Factors: Contact Interaction and Algebraic Model
• Pion form factors
• Pion form factor from an AdS deformed background
• Virtuality and Transverse Momentum Dependence of Pion Distribution Amplitude
• Factorization and infrared properties of non-perturbative contributions to DIS structure functions
• QCD factorization for forward hadron scattering at high energies
• Nonperturbative approach to the parton model
• The fundamental scale of QCD
• Study of Two-Photon Corrections in the $p\bar{p}-->e+e-$ Process: Hard Rescattering Mechanism
• Combining the small-x evolution and DGLAP for description of inclusive photon induced processes
• Intrinsic mass scale in QCD factorization