Pion scattering lengths from NA48

Details Pion scattering lengths from NA48 Pion scattering lengths from NA48

2005-10-03

arxiv.org/abs/hep-ex/0510004v2

Physics

High Energy Physics

High Energy Physics - Experiment

4 pages, 1 figure, uses espcrc2.sty. A talk done on the QCD05 conference. In the replacement version one reference is added, f

Scientific paper

The anomaly (cusp) in the mass spectrum of two neutral pions from the three-pion decays of charged kaon has been observed in the NA48/2 experiment. Using the recently developed interpretation of this effect in terms of Chiral Perturbative Theory, the pion scattering parameters are measured. The preliminary result for the pion scattering length difference, based on the part of statistics, is (a0-a2)m(pi+) = 0.281 +/- 0.007 (stat) +/- 0.014(syst) +/- 0.014(extern).

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