Virtual photons in baryon chiral perturbation theory

Details Virtual photons in baryon chiral perturbation theory Virtual photons in baryon chiral perturbation theory

1999-03-17

arxiv.org/abs/hep-ph/9903375v1

Nucl.Phys. B556 (1999) 265-291

Physics

High Energy Physics

High Energy Physics - Phenomenology

27 pp, LaTeX, uses epsf

Scientific paper

10.1016/S0550-3213(99)00339-9

We construct the general Lagrangian for relativistic and heavy baryon chiral perturbation theory with virtual photons to fourth order. We work out the electromagnetic and strong isospin violating contributions to the nucleon self-energy, the nucleon mass and the scalar form factor of the nucleon. Electromagnetic effects for the shift to the Cheng-Dashen point can be as large as 2 MeV. We also discuss the corrections to Weinberg's prediction for the scattering length difference $a(\pi^0 p) - a(\pi^0 n)$ and show that they are small.

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