γ*γ→π([eta], [eta]) transition form factors

• Verfasst von: Melikhov, Dmitri [VerfasserIn]
• Verfasst von: Stech, Berthold [VerfasserIn]
• Titel: γ*γ→π([eta], [eta]) transition form factors
• Verf.angabe: Dmitri Melikhov and Berthold Stech
• Umfang: 4 S.
• Fussnoten: Gesehen am 22.11.2018
• Titel Quelle: Enthalten in: Physical review / D
• Jahr Quelle: 2012
• Band/Heft Quelle: 85(2012), 5, S. 051901
• ISSN Quelle: 1550-2368
• ISSN Quelle: 1089-4918
• DOI: doi:10.1103/PhysRevD.85.051901
• Sprache: eng
• K10plus-PPN: 1583974806

Abstract

The surprising results by the BABAR Collaboration on the πγ transition form factor require new thoughts about the high-Q2 dependence of the form factors with virtual photons. We make use of the anomaly sum rule [J. Horejsi and O. Teryaev, Z. Phys. C 65, 691 (1995).] which relates the hadron spectral density to the axial anomaly [S. Adler, Phys. Rev. 177, 2426 (1969); J. S. Bell and R. Jackiw, Nuovo Cimento A 60, 47 (1969).]. We study the quark-hadron duality relation for this sum rule and find out that the increase of the rescaled form factor Q2Fπγ(Q2)∼log (Q2) suggested by the BABAR data requires the presence of a 1/s-correction term in the relation between the one-loop spectral density and the hadron-continuum spectral density.