Speaker
Description
A precise description of the pion vector form factor (VFF) requires not only high-quality data but also a consistent theoretical framework that captures the interplay of multiple hadronic channels. In this contribution, we focus on the construction of a dispersive model that explicitly incorporates inelastic effects beyond the elastic $\pi\pi$ channel, employing the two-potential formalism. It is discussed how analyticity and unitarity constraints guide the parametrization-building strategy and how they are preserved when extending the framework to include inelastic channels. By fitting multiple exclusive channels simultaneously, the approach allows for a more reliable extraction and differentiation of and between hadronic contributions relevant for the hadronic vacuum polarisation (HVP).
| Are you an early career researcher? | Yes, a PhD student |
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