Why measure the polarisability of the pion?


The strong interaction not only binds quarks into protons and neutrons, it also binds protons and neutrons into nuclei. Inside those nuclei, pions - made up of a quark and an antiquark - mediate the interaction. Strong interaction theory makes a precise prediction on the polarisability of pions – the degree to which their oppositely-charged constituents can be separated in an electromagnetic field.

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