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Electromagnetic corrections to the dominant two-pion exchange nucleon-nucleon potential

N. Kaiser
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Abstract

We calculate at two-loop order in chiral perturbation theory the electromagnetic corrections to the dominant two-pion exchange nucleon-nucleon interaction that is generated by the isoscalar $πN$ contact-vertex proportional to the large low-energy constant $c_3$. We find that the respective $2πγ$-exchange potential contains sizeable isospin-breaking components which amount to about -1% of the strongly attractive isoscalar central $2π$-exchange potential. The typical value of these novel charge-independence and charge-symmetry breaking central potentials is $0.3 $MeV at a nucleon distance of $r= m_π^{-1} = 1.4 $fm. Our analytical result for this presumably dominant $2πγ$-exchange interaction is in a form such that it can be easily implemented into phase-shift analyses and few-body calculations.

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N. Kaiser. 2006-05-19. Electromagnetic corrections to the dominant two-pion exchange nucleon-nucleon potential. https://doi.org/10.1103/physrevc.73.064003

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