A new look for the pion form factor

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• Matthew Kirk (Durham U.)
• Friday 07 March 2025, 16:00-17:00
• MR19 (Potter Room, Pavilion B), CMS.

If you have a question about this talk, please contact Nico Gubernari.

In this talk, I will discuss a novel and simple parametrisation of meson form factors that can be used to describe data above and below the pair production threshold, using the pion form factor as a simple example (in which case our parameterisation describes both $\pi \to \pi^0$ and $0 \to \pi \pi$ processes). To start with, I will introduce and walk through the derivation of dispersive bounds on form factors, then explain the difficulties in the traditional approach with a description of the above threshold data due to resonant poles, and the known asymptotic properties of the form factor in this region. Using data from $\pi$-H scattering and the $\tau \to \pi \pi \nu$ decay, I will show how with less than 5 free parameters (including the rho mass and decay width), we can excellently describe the data. This talk is based on my work in arXiv:2410.13764.

This talk is part of the HEP phenomenology joint Cavendish-DAMTP seminar series.

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