Measurement of the π0, η, η′ Transition Form Factors at BABAR

被引：1
|
作者：
Denig, Achim [1 ]
机构：
[1] Johannes Gutenberg Univ Mainz, Inst Nucl Phys, PRISMA Cluster Excellence, D-55099 Mainz, Germany
来源：
NUCLEAR PHYSICS B-PROCEEDINGS SUPPLEMENTS | 2013年 / 234卷
关键词：
two-photon physics; transition form factor; pseudoscalar meson; QUANTUM CHROMODYNAMICS; EXCLUSIVE PROCESSES; MESONS;
D O I：
10.1016/j.nuclphysbps.2012.12.032
中图分类号：
O412 [相对论、场论]; O572.2 [粒子物理学];
学科分类号：
摘要：
Measurements of the transition form factors of the pseudoscalar mesons pi(0), eta, eta ', if have been carried out by the BABAR collaboration at the SLAC B-factory PEP-II. The form factors F(Q(2)) were measured in two-photon processes covering the kinematic range 4 GeV2 < Q(2) < 40 GeV2. For the pi(0) form factor, results are significantly higher than predicted by Brodsky and Lepage assuming an asymptotic distribution amplitude. Data also suggest that the asymptotic regime of QCD is reached only at relatively high Q(2). We also report on measurements of the eta and eta ' transition form factors, which happen to feature a significantly different Q(2) behaviour than the one of the neutral pion.
引用
收藏
页码：283 / 286
页数：4
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