Pion–Photon Transition Form FactorLiving on the QCD Frontier

被引：0
作者：
N. G. Stefanis
机构：
[1] Institut für Theoretische Physik II,
来源：
Few-Body Systems | 2012年 / 52卷
关键词：
Form Factor; Pseudoscalar Meson; Transition Form Factor; BABAR Collaboration; Photon Transition;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
An analysis of all available data (CELLO, CLEO, BABAR) in the range [1÷ 40] GeV2 for the pion–photon transition form factor in terms of light-cone sum rules with next-to-leading-order accuracy is discussed, including twist-four contributions and next-to-next-to-leading order and twist-six corrections—the latter two via uncertainties. The antithetic trend between the BABAR data for the γ*γπ0 and those for the γ*γη(η′) transition is pointed out, emphasizing the underlying antagonistic mechanisms: endpoint enhancement for the first and endpoint-suppression for the second—each associated with pseudoscalar meson distribution amplitudes with distinct endpoint characteristics.
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页码：415 / 420
页数：5
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