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RECENT NA48/2 RESULTS ON Ke4 AND K3π DECAYS AND DETERMINATION OF THE ππ SCATTERING LENGTHS

FOR THE NA48/2 COLLABORATION

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ANDREA BIZZETI

Department of Physics, University of Modena and Reggio Emilia, I-41100 Modena, Italy

I.N.F.N., Sezione di Firenze, I-50018 Sesto Fiorentino (FI), Italy

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https://doi.org/10.1142/S0217751X09043912Cited by:0 (Source: Crossref)

Abstract

Large samples of K^± → 3π and K^± → π⁺π^-e^±ν (K_e4) decays have been collected by the NA48/2 experiment at CERN SPS.

At the π⁺π^- threshold, the π⁰π⁰ invariant mass spectrum of the decay K^± → π^±π⁰π⁰ xhibits a Wigner cusp, from which the S-wave ππ scattering lengths are extracted with high precision.

The same scattering lengths are also independently determined from the accurate measurement of the form factors in the K_e4 decay K^± → π⁺π^-e^±ν.

Keywords:

PACS: 11.55.Hx, 13.60.Hb, 25.20.Lj

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RECENT NA48/2 RESULTS ON Ke4 AND K3π DECAYS AND DETERMINATION OF THE ππ SCATTERING LENGTHS

Abstract

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