Published April 2008 | Version v1
Journal article Metadata-only

New high statistics measurement of Ke4 decay form factors and ππ scattering phase shifts

Creators

  • 1. University of Cambridge, Cavendish Laboratory, Cambridge (United Kingdom)
  • 2. University of Birmingham, Birmingham (United Kingdom)
  • 3. Universita e Sezione dell'INFN di Torino, Dipartimento di Fisica Sperimentale, Torino (Italy)
  • 4. CERN, Geneve 23 (Switzerland)
  • 5. Universita di Roma ''La Sapienza'' e Sezzione dell'INFN di Roma, Roma (Italy)
  • 6. Istituto di Cosmogeofisica del CNR di Torino, Torino (Italy)
  • 7. Universita e Sezione dell'INFN di Ferrara, Dipartimento di Fisica, Ferrara (Italy)
  • 8. Joint Institute for Nuclear Research, Dubna (Russian Federation)
  • 9. Scuola Normale Superiore and INFN, Pisa (Italy)
  • 10. Universite de la Mediterranee, Centre de Physique des Particules de Marseille, IN2P3-CNRS, Marseille (France)
  • 11. The University of Chicago, The Enrico Fermi Institute, Chicago, IL (United States)
  • 12. George Mason University, Department of Physics and Astronomy, Fairfax, VA (United States)
  • 13. University of Edinburgh, Department of Physics and Astronomy, Edinburgh (United Kingdom)
  • 14. Universita di Modena, Istituto di Fisica, Modena (Italy)
  • 15. Universita e Sezione dell'INFN di Firenze, Dipartimento di Fisica, Firenze (Italy)
  • 16. Universita di Urbino, Istituto di Fisica, Urbino (Italy)
  • 17. Universitaet Mainz, Institut fuer Physik, Mainz (Germany)
  • 18. Universitaet Bonn, Physikalisches Institut, Bonn (Germany)
  • 19. Stanford University, SLAC, Menlo Park, CA (United States)
  • 20. Northwestern University, Department of Physics and Astronomy, Evanston, IL (United States)
  • 21. UCLA, Los Angeles, CA (United States)
  • 22. Universita e Sezione dell'INFN di Perugia, Dipartimento di Fisica, Perugia (Italy)
  • 23. Universita, Scuola Normale Superiore e Sezione dell'INFN di Pisa, Dipartimento di Fisica, Pisa (Italy)
  • 24. DSM/DAPNIA - CEA Saclay, Gif-sur-Yvette, Bat 141 (France)
  • 25. Universitaet Siegen, Fachbereich Physik, Siegen (Germany)
  • 26. Universita e Sezione dell'INFN di Torino, Dipartimento di Fisica Sperimentale, Torino (IT)
  • 27. CERN, Geneve 23 (CH)
  • 28. Oesterreichische Akademie der Wissenschaften, Institut fuer Hochenergiephysik, Wien (AT)

Description

We report results from a new measurement of the Ke4 decay K±→π+π-e±ν by the NA48/2 collaboration at the CERN SPS, based on a partial sample of more than 670 000 Ke4 decays in both charged modes collected in 2003. The form factors of the hadronic current (F,G,H) and ππ phase difference (δ=δs-δp) have been measured in ten independent bins of the ππ mass spectrum to investigate their variation. A sizeable acceptance at large ππ mass, a low background and a very good resolution contribute to an improved experimental accuracy, a factor two better than in the previous measurement, when extracting the ππ scattering lengths a00 and a02. Under the assumption of isospin symmetry and using numerical solutions of the Roy equations, the following values are obtained in the plane (a00,a02): a00=0.233±0.016stat±0.007syst, a02=-0.0471±0.011stat±0.004syst. The presence of potentially large isospin effects is also considered and will allow comparison with precise predictions from Chiral Perturbation Theory. (orig.)

Availability note (English)

Available from: http://dx.doi.org/10.1140/epjc/s10052-008-0547-0

Additional details

Identifiers

DOI
10.1140/epjc/s10052-008-0547-0;

Publishing Information

Journal Title
European Physical Journal. C
Journal Volume
54
Journal Issue
3
Journal Page Range
p. 411-423
ISSN
1434-6044

INIS

Country of Publication
Germany
Country of Input or Organization
Germany
INIS RN
39063490
Subject category
S72: PHYSICS OF ELEMENTARY PARTICLES AND FIELDS;
Resource subtype / Literary indicator
Numerical Data
Descriptors DEI
EFFECTIVE MASS; EXPERIMENTAL DATA; FINAL-STATE INTERACTIONS; FORM FACTORS; KAONS MINUS; KAONS PLUS; MASS SPECTRA; PHASE SHIFT; PION-PION INTERACTIONS; PIONS MINUS; PIONS PLUS; POTENTIAL SCATTERING; SCATTERING LENGTHS; SEMILEPTONIC DECAY
Descriptors DEC
BOSONS; DATA; DECAY; DIMENSIONLESS NUMBERS; DIMENSIONS; ELASTIC SCATTERING; ELEMENTARY PARTICLES; HADRON-HADRON INTERACTIONS; HADRONS; INFORMATION; INTERACTIONS; KAONS; LENGTH; MASS; MESON-MESON INTERACTIONS; MESONS; NUMERICAL DATA; PARTICLE DECAY; PARTICLE INTERACTIONS; PARTICLE PROPERTIES; PIONS; PSEUDOSCALAR MESONS; SCATTERING; SPECTRA; STRANGE MESONS; STRANGE PARTICLES; WEAK PARTICLE DECAY

Optional Information

Collaborations
The NA48/2 Collaboration