English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

It is noted that the low-energy behavior of the pion-photon transition formfactor $F_{\pi\gamma}(Q^2)$ is sensitive to the transverse distribution of thepion wavefunction, and its high-energy behavior is sensitive to thelongitudinal one. Thus a careful study on $F_{\pi\gamma}(Q^2)$ can providehelpful information on the pion wavefunction precisely. In this paper, wepresent a combined analysis of the data on $F_{\pi\gamma}(Q^2)$ reported by theCELLO, the CLEO, the BABAR and the BELLE collaborations. It is performed byusing the method of least squares. By using the combined measurements of BELLEand CLEO Collaborations, the pion wavefunction longitudinal and transversebehavior can be fixed to a certain degree, i.e. we obtain $\beta \in[0.691,0.757] \rm GeV$ and $B \in [0.00,0.235]$ for $P_{\chi^2} \geq 90\%$,where $\beta$ and $B$ are two parameters of a convenient pion wavefunctionmodel whose distribution amplitude can mimic the various longitudinal behaviorunder proper choice of parameters. We observe that the CELLO, CLEO and BELLEdata are consistent with each other, all of which prefers the asymptotic-likedistribution amplitude; while the BABAR data prefers a more broad distributionamplitude, such as the CZ-like one.

The longitudinal and transverse distributions of the pion wavefunction from the present experimental data on the pion-photon transition form factor