Impact of the higher twist effects on the {gamma}{gamma}*{yields}{pi}{sup 0} transition form factor

Journal Article · Thu Dec 01 00:00:00 EST 2005 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PhysRevD.72.114010· OSTI ID:20774430

Agaev, S S ^[1]

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1. Institut fuer Theoretische Physik, Universitaet Regensburg, D-93040 Regensburg (Germany)

We reanalyze the {gamma}{gamma}*{yields}{pi}{sup 0} transition form factor F{sub {pi}}{sub {gamma}}(Q{sup 2}) within the QCD light-cone sum rules method with the twist-4 accuracy. In computations, the pion leading twist distribution amplitude (DA) with two nonasymptotic terms and the renormalon method-inspired twist-4 DAs are used. The latters allow us to estimate the impact of effects due to higher conformal spin components in the pion twist-4 DAs on the form factor F{sub {pi}}{sub {gamma}}(Q{sup 2}). Obtained theoretical predictions are employed to deduce constraints on the pion DAs from CELLO and CLEO data.

• OSTI ID: 20774430
• Journal Information: Physical Review. D, Particles Fields, Vol. 72, Issue 11; Other Information: DOI: 10.1103/PhysRevD.72.114010; (c) 2005 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ACCURACY
AMPLITUDES
CESR STORAGE RING
DISTRIBUTION
FORM FACTORS
LIGHT CONE
MULTIPARTICLE SPECTROMETERS
PARTICLE IDENTIFICATION
PHOTON-PHOTON INTERACTIONS
PIONS NEUTRAL
QUANTUM CHROMODYNAMICS
SPIN
SUM RULES