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Light quark mass difference and isospin breaking in electromagnetic pion production
1998
Physics Letters B
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It is demonstrated that there is a dynamic isospin breaking effect in the near threshold γ^* N→π N reaction due to the mass difference of the up and down quarks, which also causes isospin breaking in the π N system. The photopion reaction is affected through final state π N interactions (formally implemented by unitarity and time reversal invariance). It is also demonstrated that the near threshold γN⃗→π N reaction is a practical reaction to measure isospin breaking in the π N system, which was
doi:10.1016/s0370-2693(98)01257-x
fatcat:bn4xuamzszbl5hlwtuowyswtry