期刊
PHYSICAL REVIEW D
卷 86, 期 3, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.86.031501
关键词
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资金
- Heisenberg-Landau Program [2012]
- Russian Foundation for Fundamental Research [12-02-00613a]
- BRFBR-JINR Cooperation Program [F10D-002]
- HadronPhysics2
- Spanish Ministerio de Economia y Competitividad
- EU [FPA2010-21750-C02-01, AIC10-D-000598, GVPrometeo2009/129]
We perform a comparative theoretical study of the data at spacelike momentum transfer for the gamma*gamma -> pi(0) transition form factor, just reported by the Belle Collaboration, vs. those published before by BABAR, also including the older CLEO and CELLO data. Various implications for the structure of the pi(0) distribution amplitude vis-a-vis those data are discussed and the existing theoretical predictions are classified into three distinct categories. We argue that the actual bifurcation of the data with antithetic trends is artificial and reason that the Belle data are the better option.
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