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 believed that one can extract more accurate information of the piondistribution amplitude from the pion-photon transition form factor (TFF) due tothe single pion in this process. However the BABAR and Belle data of thepion-photon TFF have a big difference for $Q^2\in [15,40]$ GeV$^2$, and atpresent, the pion DA can not be definitely determined from the pion-photon TFF.it is crucial to find the right pion DA behavior and to determine which data ismore reliable. In this letter, we perform a combined analysis of the mostexisting data of the processes involving pion by using a general model for thepion wavefunction/DA. Such a DA model can mimic all the existed pion DAbehaviors, whose parameters can be fixed by the constraints from the processes$\pi^0\to\gamma\gamma$, $\pi\to\mu\nu$, $B\to\pi l \nu$, and etc. Especially,we examine the $B \rightarrow \pi$ transition form factors that providesanother constraint to the parameter $B$ in our DA model, which results in $B\in[0.00,0.29]$. This inversely shows that the predicted curve for thepion-photon TFF is between the BABAR and Belle data in the region $Q^2\in$$[15,40]$ GeV$^2$. It will be tested by coming more accurate data at large$Q^2$ region, and the definite behavior of pion DA can be concluded finally.

Finding a way to determine the pion distribution amplitude from the experimental data