Low energy ππ scattering has been studied with high precision by the NA48/2 experiment at the CERN SPS using large data samples of K ±→π±π0π 0 and K±→π+π -e±ν(Ke4) decays. The π0π0 invariant mass distribution in the K ±→π±π0π 0 decay exhibits a Wigner cusp at the π+π - threshold, from which the scattering lengths a0 and a2 are extracted. The measurement of a0 and a2 is also performed from Ke4 decay, with similar precision. The combination of these measurement provides a stringent test of Chiral Perturbation Theory. © 2011 American Institute of Physics.
Precision measurements of ππ scattering lengths at NA48/2 / Bizzeti, A.. - In: AIP CONFERENCE PROCEEDINGS. - ISSN 0094-243X. - 1374:(2011), pp. 639-642. (Intervento presentato al convegno 12th International Conference on Meson-Nucleon Physics and the Structure of the Nucleon, MENU 2010 tenutosi a Williamsburg, VA, usa nel 2010) [10.1063/1.3647221].
Precision measurements of ππ scattering lengths at NA48/2
Bizzeti A.
2011
Abstract
Low energy ππ scattering has been studied with high precision by the NA48/2 experiment at the CERN SPS using large data samples of K ±→π±π0π 0 and K±→π+π -e±ν(Ke4) decays. The π0π0 invariant mass distribution in the K ±→π±π0π 0 decay exhibits a Wigner cusp at the π+π - threshold, from which the scattering lengths a0 and a2 are extracted. The measurement of a0 and a2 is also performed from Ke4 decay, with similar precision. The combination of these measurement provides a stringent test of Chiral Perturbation Theory. © 2011 American Institute of Physics.
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