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Determination of the pion distribution amplitude
黄涛(理); 钟涛;Huang, T; Zhong, T; Wu, XG
2013
发表期刊PHYSICAL REVIEW D
卷号88期号:3页码:34013
摘要Currently, not enough is known to determine the hadron distribution amplitudes (DAs)-which are universal physical quantities in the high-energy processes involving hadrons-in order to apply perturbative QCD to exclusive processes. Even for the simplest pion, one cannot discriminate between different DA models. Conversely, one expects that processes involving pions can in principle provide strong constraints on the pion DA. For example, the pion-photon transition form factor (TFF) can get accurate information about the pion wave function or DA due to the single pion in this process. However, the data from Belle and BABAR show a big difference regarding this TFF in high-Q(2) regions; at present, they are unable to determine the pion DA. In the present paper, we think it is still possible to determine the pion DA as long as we perform a combined analysis of the existing data of the processes involving pions, such as pi -> mu(nu) over bar, pi(0) -> gamma gamma, B -> pi l nu, D -> pi l nu, etc. Based on the revised light-cone harmonic oscillator model, a convenient DA model is suggested, whose parameter B-which dominates its longitudinal behavior for phi(pi)(x, mu(2))-can be determined in a definite range by these processes. A light-cone sum rule analysis of the semileptonic processes B -> pi l nu and D -> pi l nu leads to a narrow region B = [0.01; 0.14], which indicates a slight deviation from the asymptotic DA. Then, one can predict the behavior of the pion-photon TFF in high-Q(2) regions which can be tested in future experiments. This method provides the possibility that the pion DA will be finally determined by a global fit.
学科领域Astronomy & Astrophysics; Physics
DOI10.1103/PhysRevD.88.034013
收录类别SCI
WOS记录号WOS:000322916300004
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被引频次:16[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ihep.ac.cn/handle/311005/224530
专题理论物理室
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GB/T 7714
Huang T,钟涛;Huang, T,Zhong, T,et al. Determination of the pion distribution amplitude[J]. PHYSICAL REVIEW D,2013,88(3):34013.
APA 黄涛,钟涛;Huang, T,Zhong, T,&Wu, XG.(2013).Determination of the pion distribution amplitude.PHYSICAL REVIEW D,88(3),34013.
MLA 黄涛,et al."Determination of the pion distribution amplitude".PHYSICAL REVIEW D 88.3(2013):34013.
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