Lorentz Invariant Baryon CHPT

Details Lorentz Invariant Baryon CHPT Lorentz Invariant Baryon CHPT

2000-11-06

arxiv.org/abs/hep-ph/0011079v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

Latex, 12 pages. Plenary talk given at "Chiral Dynamics 2000: Theory and Experiment", Newport News, USA, 17-22 July 2000

Scientific paper

Using the example of the elastic $\pi N$-amplitude, we discuss the low energy expansion of QCD amplitudes in the sector with baryon number one. We show that the chiral expansion of these amplitudes breaks down in certain regions of phase space and present a framework which leads to a coherent description throughout the low energy region, while keeping Lorentz and chiral invariance manifest at every stage of the calculation. We explain how to construct a representation of the pion nucleon scattering amplitude in terms of functions of a single variable, which is valid to $O(q^4)$ and properly accounts for the $\pi\pi$- and $\pi N$-cuts required by unitarity.

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