Measurement of the charged-pion polarisability

C. Adolph, R. Akhunzyanov, M. G. Alexeev +210

The COMPASS collaboration at CERN has investigated pion Compton scattering, ${\pi }^{-}\gamma \to {\pi }^{-}\gamma$, at centre-of-mass energy below 3.5 pion masses. The process is embedded in the r…