Papers › Polarizabilities from kaon Compton scattering
Polarizabilities from kaon Compton scattering
Dominik Stamen, Jan Luca Dammann, Yannis Korte, Bastian Kubis
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The polarizabilities of light pseudoscalar mesons can be extracted from differential cross sections for Compton scattering near threshold. While this has been accomplished for charged pions employing Primakoff reactions, a corresponding measurement for kaons will be affected by the presence of the K^*(892) resonance not too far from threshold. We propose a method to extend the energy range serviceable for this purpose by reconstructing the K^*(892) contribution model-independently from its Kπ intermediate state, using dispersion theory. We point out that, in contrast to the charged-pion analog, there is likely no strong hierarchy between sum and difference of electric and magnetic dipole polarizabilities; we discuss the sensitivity to disentangling both by improved experimental angular coverage.
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