Measurements of Meson Polarizabilies
February 28, 2020
The EM polarizability of the charged pion ranks among the most important tests of low-energy QCD presently unresolved by experiment. It makes a potentially significant contribution to hadronic light-by-light scattering impacting the uncertainty in the SM. Experimentally, the electromagnetic polarizability has been accessed using various reactions which include Compton scattering and the Primakoff effect. Recently, interest in meson polarizabilities has been renewed with a recent COMPASS experiment(2015) and an approved experiment at Jefferson Lab. A brief status of the current experimental landscape of meson polarizabilities is presented.
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