Isospin symmetry breaking and the neutron-proton mass difference [PDF]
Nasrallah F. NasrallahQCD sum rules using polynomial kernels are used to evaluate the strong part of the proton-neutron mass difference DeltaM_np in a model independent fashion. The result for the mass difference turns out to depend sensitively on the value of the four quark condensate <(qq)^2> and reproduces the experimental value of DeltaM_np for <(qq)^2>~ 2View original: http://arxiv.org/abs/1207.0079^2.
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