June 29, 2015 to July 3, 2015
Europe/Rome timezone

Extending the baryon ChPT beyond the low-energy region

Jun 30, 2015, 5:30 PM
Room PS4 (Building E, Polo Fibonacci, Pisa)

Room PS4

Building E, Polo Fibonacci, Pisa

Talk Hadron Structure and Meson-Baryon Interaction Working Group Parallel Session 4 - Hadron Structure & Meson-Baryon Interaction WG


Jambul Gegelia (Forschungszentrum Jülich)


We suggest an extension of the one-nucleon sector of baryon chiral perturbation theory beyond the low-energy region. Applicability of the proposed approach for higher energies is restricted to small scattering angles, i.e. the kinematical region where the quark structure of hadrons cannot be resolved. The main idea is to re-arrange the low-energy effective Lagrangian according to a new power counting and for loop diagrams exploit the freedom of the choice of the renormalization condition. We generalize the extended on-mass-shell scheme for the one-nucleon sector of the baryon chiral perturbation theory by choosing a sliding scale, i.e. expand the physical amplitudes around kinematical points far beyond the threshold. This requires an introduction of complex-valued renormalized coupling constants which can be either extracted from experimental data, or calculated using the renormalization group evolution of coupling constants fixed in threshold region.

Primary author

Jambul Gegelia (Forschungszentrum Jülich)


Prof. Evgeny Epelbaum (Ruhr-Universität Bochum) Prof. Ulf-G. Meißner (HISKP, Uni-Bonn)

Presentation materials