pi-pi and pi-K scatterings in three-flavour resummed chiral perturbation theory

Details pi-pi and pi-K scatterings in three-flavour resummed chiral perturbation theory pi-pi and pi-K scatterings in three-flavour resummed chiral perturbation theory

2007-10-09

arxiv.org/abs/0710.1696v1

J.Phys.Conf.Ser.110:052012,2008

Physics

High Energy Physics

High Energy Physics - Phenomenology

Proceedings of the EPS-HEP 2007 Conference, Manchester (UK). 3 pages, 1 figure

Scientific paper

10.1088/1742-6596/110/5/052012

The (light but not-so-light) strange quark may play a special role in the low-energy dynamics of QCD. The presence of strange quark pairs in the sea may have a significant impact of the pattern of chiral symmetry breaking : in particular large differences can occur between the chiral limits of two and three massless flavours (i.e., whether m_s is kept at its physical value or sent to zero). This may induce problems of convergence in three-flavour chiral expansions. To cope with such difficulties, we introduce a new framework, called Resummed Chiral Perturbation Theory. We exploit it to analyse pi-pi and pi-K scatterings and match them with dispersive results in a frequentist framework. Constraints on three-flavour chiral order parameters are derived.

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