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We calculate at two-loop order in chiral perturbation theory theelectromagnetic corrections to the two-pion exchange nucleon-nucleoninteraction that is generated by the isovector spin-flip $\pi\pi NN$contact-vertex proportional to the large low-energy constant $c_4\simeq 3.4$GeV$^{-1}$. We find that the respective $2\pi\gamma$-exchange potentialscontain sizeable isospin-breaking components which reach up to -4% ofcorresponding isovector $2\pi$-exchange potentials. The typical values of thesenovel charge-independence breaking spin-spin and tensor potentials are $-0.11$MeV and $0.09 $MeV, at a nucleon distance of $r=m_\pi^{-1}=1.4 $fm. Thecharge-symmetry breaking spin-spin and tensor potentials come out a factor of2.4 smaller. Our analytical results for these presumably dominantisospin-violating spin-spin and tensor NN-forces are in a form such that theycan be easily implemented into phase-shift analyses and few-body calculations.Comment: 7 pages, 1 figure, 2 tables, to be published in Physical Review C:  Brief report

physical review. c. nuclear physics/physical review. c, nuclear physics

Dominant<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mn>2</mml:mn><mml:mi>π</mml:mi><mml:mi>γ</mml:mi></mml:mrow></mml:math>-exchange nucleon-nucleon interaction: Spin-spin and tensor potentials

Dominant2πγ-exchange nucleon-nucleon interaction: Spin-spin and tensor potentials