scholarly journals Pion electromagnetic form factor, perturbative QCD, and large-NcRegge models

2008 ◽  
Vol 78 (3) ◽  
Author(s):  
Enrique Ruiz Arriola ◽  
Wojciech Broniowski
Keyword(s):  
Form Factor ◽  
Perturbative Qcd ◽  
Electromagnetic Form Factor ◽  
Pion Electromagnetic Form Factor ◽  
Pion Electromagnetic Form

scholarly journals ON PERTURBATIVE QCD OF HARD AND SOFT PROCESSES

2009 ◽  
Vol 24 (35n37) ◽  
pp. 2803-2824 ◽  
Author(s):  
A. V. EFREMOV ◽  
A. V. RADYUSHKIN
Keyword(s):  
Form Factor ◽  
Perturbative Qcd ◽  
Electromagnetic Form Factor ◽  
High Energy ◽  
Large Momentum ◽  
Pion Electromagnetic Form Factor ◽  
Twist Operators ◽  
Energy Processes ◽  
Soft Processes ◽  
Pion Electromagnetic Form

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.

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