Large samples of K+- -> 3pi and K+- -> pi+ pi- e+- nu (Ke4) decays have been collected by the NA48/2 experiment at CERN SPS.At the pi+ pi- threshold, the pi0 pi0 invariant mass spectrum of the decay K+- -> pi+- pi0 pi0 exhibits 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 Ke4 decay K+- -> pi+ pi- e+- nu.
Recent NA48/2 results on Ke4 and K3pi decays and determination of the pi pi scattering lengths / Bizzeti, Andrea. - In: INTERNATIONAL JOURNAL OF MODERN PHYSICS A. - ISSN 0217-751X. - STAMPA. - 24:2-3(2009), pp. 488-492. [10.1142/s0217751x09043912]
Recent NA48/2 results on Ke4 and K3pi decays and determination of the pi pi scattering lengths
BIZZETI, Andrea
2009
Abstract
Large samples of K+- -> 3pi and K+- -> pi+ pi- e+- nu (Ke4) decays have been collected by the NA48/2 experiment at CERN SPS.At the pi+ pi- threshold, the pi0 pi0 invariant mass spectrum of the decay K+- -> pi+- pi0 pi0 exhibits 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 Ke4 decay K+- -> pi+ pi- e+- nu.
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