Dispersive representation of K -> 3 pi amplitudes and cusps

Details Dispersive representation of K -> 3 pi amplitudes and cusps Dispersive representation of K -> 3 pi amplitudes and cusps

2008-10-10

arxiv.org/abs/0810.1906v1

Nucl.Phys.Proc.Suppl. 186 (2009) 334-337

Physics

High Energy Physics

High Energy Physics - Phenomenology

4 pages, 1 figure, to appear in Proceedings of the conference QCD 08, Montpellier, 7-12 July 2008

Scientific paper

10.1016/j.nuclphysbps.2008.12.07

The NA48/2 collaboration has shown clear experimental evidence for a cusp in
the data for K -> pi pi^0 pi^0. This effect can be used to extract information
on the pi-pi scattering lengths. We address this issue using a two-loop
dispersive construction of pi pi -> pi pi and K -> pi pi pi amplitudes in the
presence of isospin breaking.

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