Implication on the pion distribution amplitude from the pion-photon transition form factor with the new BABAR data
Implication on the pion distribution amplitude from the pion-photon transition form factor with the new BABAR data
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新 BABAR 数据对 π 介子-光子跃迁形状因子对 π 介子分布幅度的影响
DOI：
10.1103/physrevd.82.034024
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发表时间：
2010-05
影响因子：
5
通讯作者：
Wu, Xing-Gang
中科院分区：
文献类型：
--
作者：
Huang, Tao;Wu, Xing-Gang
关于介子-光子跃迁形状因子的新的BABA数据引起了人们对确定介子分布幅度的兴趣。为了解释数据，我们同时考虑了主价夸克态和非价夸克态的贡献，其中给出了价夸克部分直到次导数级，非价夸克部分由唯象模型估计，该模型基于Q(2)-gt；0和Q(2)-gt；无穷大的极限行为。我们的结果表明，在大Q(2)区，为了与新的Babar数据一致，应该采用一个更宽的幅度，而不是类似于渐近分布的π分布幅度。结果表明，在低能区和高能区的新的Babar数据可以通过设置B在0.60附近同时得到解释，在这个范围内，π分布幅度接近Chernyak-Zitnitsky形式。
The new BABAR data on the pion-photon transition form factor arouses people's interest for the determination of the pion distribution amplitude. To explain the data, we take both the leading valence quark state's and the nonvalence quark state's contributions into consideration, where the valence quark part up to next-to-leading order is presented and the nonvalence quark part is estimated by a phenomenological model based on its limiting behavior at both Q(2) -> 0 and Q(2) -> infinity. Our results show that to be consistent with the new BABAR data at the large Q(2) region, a broader amplitude other than the asymptoticlike pion distribution amplitude should be adopted. The broadness of the pion distribution amplitude is controlled by a parameter B. It has been found that the new BABAR data at low and high energy regions can be explained simultaneously by setting B to be around 0.60, in which the pion distribution amplitude is closed to the Chernyak-Zhitnitsky form.
影响因子：
4.3
作者：
A. Capri;A. N. Kamal
通讯作者：
A. Capri;A. N. Kamal