The gluon content of the η and η^′ mesons

2004/09/16 by N. G. Stefanis, S. S. Agaev, Stefanis, N. G. +1
Chemistry · Physics and Astronomy · #Advanced NMR Techniques and Applications #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ph

paper · pdf · doi:10.48550/arxiv.hep-ph/0409198

19 pages, 6 figures consisting of 9 eps files. Needs here.sty. Typo in $beta_1$ corrected. Invited plenary talk presented by the first author at Second Symposium on Threshold Meson Production in pp and pd Interactions. Extended COSY-11 collaboration meeting. Collegium Maius, Cracow, Poland, May 31-June 3, 2004

openalex publication_date 2004/09/16 · arxiv created 2004/09/19 · openalex created_date 2020/08/07 · openalex updated_date 2026/07/28

Abstract

We analyze power-suppressed contributions to singlet pseudoscalar η and η^′ meson transition form factors. These corrections stem from endpoint singularities and help improve the agreement between QCD theory and the experimental data, in particular, at low-momentum transfers. Using the CLEO data, we extract information on the profile of the η₁ and η₈ distribution amplitudes in the SU(3)_F octet-singlet basis employing both the one-angle and the two-angle mixing schemes. In the former scheme, we find good agreement with the CLEO data, while in the second case, our approach requires non-asymptotic profiles for these mesons.

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