A new analysis of $πK$ scattering from Roy and Steiner type equations

Details A new analysis of $πK$ scattering from Roy and Steiner type equations A new analysis of $πK$ scattering from Roy and Steiner type equations

2003-10-24

arxiv.org/abs/hep-ph/0310283v3

Eur.Phys.J.C33:409-432,2004

Physics

High Energy Physics

High Energy Physics - Phenomenology

45 pages, 17 figures. v2: New title, minor corrections

Scientific paper

10.1140/epjc/s2004-01591-1

With the aim of generating new constraints on the OZI suppressed couplings of chiral perturbation theory a set of six equations of the Roy and Steiner type for the $S$- and $P$-waves of the $\pi K$ scattering amplitudes is derived. The range of validity and the multiplicity of the solutions are discussed. Precise numerical solutions are obtained in the range $E\lapprox 1$ GeV which make use as input, for the first time, of the most accurate experimental data available at $E > 1$ GeV for both $\pi K\to\pi K$ and $\pi\pi\to K\bar{K}$ amplitudes. Our main result is the determination of a narrow allowed region for the two S-wave scattering lengths. Present experimental data below 1 GeV are found to be in generally poor agreement with our results. A set of threshold expansion parameters, as well as sub-threshold parameters are computed. For the latter, matching with the SU(3) chiral expansion at NLO is performed.

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