Emphasizing the different trends of the existing data for the $\gamma^*\gamma \to \pi^0$ transition form factor

TL;DR

This paper analyzes recent experimental data on the $^*\gamma \to \pi^0$ transition form factor, revealing discrepancies between Belle and BaBar results and comparing them with theoretical predictions using light-cone sum rules.

Contribution

It provides a detailed comparison of Belle and BaBar data on the transition form factor using light-cone sum rules and highlights the inconsistency between the datasets.

Findings

Belle data agrees with theoretical predictions

BaBar data conflicts with Belle and theory

No overlap between Belle and BaBar data at 1-sigma level

Abstract

The new data on the $\gamma^*\gamma \to \pi^0$ transition form factor of the Belle Collaboration are analyzed in comparison with those of BaBar (including the older data of CELLO and CLEO) using an approach based on light-cone sum rules. Performing a 2-, and a 3-parametric fit to these data, we found that the Belle and the BaBar data have no overlap at the $1\sigma$ level. While the Belle data agree with our predictions, the Babar data are in conflict with them.