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Precise tests of low energy QCD from K-e4 decay properties

Research output: Contribution to journalArticle

  • J. R. Batley
  • G. Kalmus
  • C. Lazzeroni
  • D. J. Munday
  • M. W. Slater
  • S. A. Wotton
  • R. Arcidiacono
  • G. Bocquet
  • N. Cabibbo
  • A. Ceccucci
  • D. Cundy
  • V. Falaleev
  • M. Fidecaro
  • L. Gatignon
  • A. Gonidec
  • W. Kubischta
  • A. Norton
  • A. Maier
  • M. Patel
  • A. Peters
  • S. Balev
  • P. L. Frabetti
  • E. Goudzovski
  • P. Hristov
  • V. Kekelidze
  • V. Kozhuharov
  • L. Litov
  • D. Madigozhin
  • E. Marinova
  • N. Molokanova
  • I. Polenkevich
  • Yu. Potrebenikov
  • S. Stoynev
  • A. Zinchenko
  • E. Monnier
  • E. Swallow
  • R. Winston
  • P. Rubin
  • A. Walker
  • W. Baldini
  • A. Cotta Ramusino
  • P. Dalpiaz
  • C. Damiani
  • M. Fiorini
  • A. Gianoli
  • M. Martini
  • F. Petrucci
  • M. Savrie
  • M. Scarpa
  • H. Wahl
  • NA48 2 Collaboration

Related Edinburgh Organisations

Original languageEnglish
Pages (from-to)635-657
Number of pages23
JournalEuropean Physical Journal C: Particles and Fields
Volume70
Issue number3
DOIs
StatePublished - Dec 2010

Abstract

We report results from the analysis of the K-+/- -> pi(+)pi(-) C-+/-nu (Ke4) decay by the NA48/ 2 collaboration at the CERN SPS, based on the total statistics of 1.13 million decays collected in 2003- 2004. The hadronic form factors in the S- and P- wave and their variation with energy are obtained. The phase difference between the S- and P- wave states of the pp system is accurately measured and allows a precise determination of a(0)(0) and a(2) (0), the I = 0 and I = 2 S- wave pi pi scattering lengths: a(0) (0) = 0.2220 +/- 0.0128 (stat) +/- 0.0050(syst) +/- 0.0037th, a(2) (0) = - 0.0432 +/- 0.0086(stat) +/- 0.0034(syst) +/- 0.0028th. Combination of this result with the other NA48/ 2 measurement obtained in the study of K +/- -> pi(0)pi(0) pi(+/-) decays brings an improved determination of a(0)(0) and the first precise experimental measurement of a(2) (0), providing a stringent test of Chiral Perturbation Theory predictions and lattice QCD calculations. Using constraints based on analyticity and chiral symmetry, even more precise values are obtained: a(0) (0) = 0.2196 +/- 0.0028(stat) +/- 0.0020(syst) and a(2) (0) =- 0.0444 +/- 0.0007(stat) +/- 0.0005(syst) +/- 0.0008(ChPT).

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