Pion-photon transition form factor in light-cone sum rules

Journal Article · Tue Oct 23 00:00:00 EDT 2012 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.4763506· OSTI ID:22075657

Pimikov, A V; Bakulev, A P; Mikhailov, S V; Stefanis, N G ^[1]

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1. Departamento de Fisica Teorica -IFIC, Universidad de Valencia-CSIC, E-46100 Burjassot, Valencia (Spain) and Bogoliubov Laboratory of Theoretical Physics, JINR, 141980 Dubna (Russian Federation)

We extract constraints on the pion distribution amplitude from available data on the pionphoton transition form factor in the framework of light-cone sum rules. A pronounced discrepancy (2.7 - 3){sigma} between the Gegenbauer expansion coefficients extracted from the CELLO, CLEO, and Belle experimental data relative to those from BaBar is found. Predictions for the pion-photon transition form factor are presented by employing a pion distribution amplitude obtained long ago from QCD sum rules with nonlocal condensates. These predictions comply with the Belle data but disagree with those of BaBar beyond 9 GeV{sup 2}.

• OSTI ID: 22075657
• Journal Information: AIP Conference Proceedings, Vol. 1492, Issue 1; Conference: QCD-WORK 2012: International workshop on quantum chromodynamics: Theory and experiment, Lecce (Italy), 18-21 Jun 2012; Other Information: (c) 2012 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
CESR STORAGE RING
FORM FACTORS
FOUR MOMENTUM TRANSFER
LIGHT CONE
MULTIPARTICLE SPECTROMETERS
PARTICLE IDENTIFICATION
PHOTON-PHOTON INTERACTIONS
PHOTONS
PIONS
QUANTUM CHROMODYNAMICS
SUM RULES