Form factors and QCD in spacelike and timelike region

Bakulev, A P; Radyushkin, A V; Stefanis, N G

doi:10.1103/PhysRevD.62.113001

Title: Form factors and QCD in spacelike and timelike region

Journal Article · Mon May 01 00:00:00 EDT 2000 · Phys.Rev.D62:113001,2000

DOI:https://doi.org/10.1103/PhysRevD.62.113001· OSTI ID:754870

Bakulev, A P; Radyushkin, A V; Stefanis, N G

The authors analyze the basic hard exclusive processes: {pi}{gamma}{sup *}{gamma}-transition, pion and nucleon electromagnetic form factors, and discuss the analytic continuation of QCD formulas from the spacelike q{sup 2} < 0 to the timelike region q{sup 2} > 0 of the relevant momentum transfers. They describe the construction of the timelike version of the coupling constant {alpha}{sub s}. They show that due to the analytic continuation of the collinear logarithms each eigenfunction of the evolution equation acquires a phase factor and investigate the resulting interference effects which are shown to be very small. They found no sources for the K-factor-type enhancements in the perturbative QCD contribution to the hadronic form factors. To study the soft part of the pion electromagnetic form factor, they use a QCD sum rule inspired model and show that there are non-canceling Sudakov double logarithms which result in a K-factor-type enhancement in the timelike region.

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Research Organization:: Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)

Sponsoring Organization:: USDOE Office of Energy Research (ER) (US)

DOE Contract Number:: AC05-84ER40150

OSTI ID:: 754870

Report Number(s):: DOE/ER/40150-1418; JLAB-THY-00-12; RUB-TPII-06/00; hep-ph/0005085; TRN: US0100880

Journal Information:: Phys.Rev.D62:113001,2000, Vol. D, Issue 62; Other Information: Submitted to Phys.Rev.D62:113001,2000; PBD: 1 May 2000

Country of Publication:: United States

Language:: English

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