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Search for direct CP violating charge asymmetries in K±→π±π+π- and K±→π±π0π0 decays

  • Regular Article - Experimental Physics
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Abstract

A measurement of the direct CP violating charge asymmetries of the Dalitz plot linear slopes Ag=(g+-g-)/(g++g-) in K±→π±π+π- and K±→π±π0π0 decays by the NA48/2 experiment at CERN SPS is presented. A new technique of asymmetry measurement involving simultaneous K+ and K- beams and a large data sample collected allowed a result of an unprecedented precision. The charge asymmetries were measured to be Ac g=(-1.5±2.2)×10-4 with 3.11×109K±→π±π+π- decays, and An g=(1.8±1.8)×10-4 with 9.13×107K±→π±π0π0 decays. The precision of the results is limited mainly by the size of the data sample.

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Authors and Affiliations

  1. Cavendish Laboratory, University of Cambridge, Cambridge, CB3 0HE,, UK

    J.R. Batley, A.J. Culling, G. Kalmus, C. Lazzeroni, D.J. Munday, M.W. Slater & S.A. Wotton

  2. CERN, 1211, Genève 23, Switzerland

    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

  3. Joint Institute for Nuclear Research, Joliot-Curie 6, Moscow region, 141980, Dubna, Russian Federation

    S. Balev, P.L. Frabetti,  E. Goudzovski, P. Hristov, V. Kekelidze, V. Kozhuharov, L. Litov, D. Madigozhin, E. Marinova, N. Molokanova, I. Polenkevich, Y. Potrebenikov, S. Stoynev & A. Zinchenko

  4. The Enrico Fermi Institute, The University of Chicago, Chicago, Illinois, 60126, USA

    E. Monnier, E. Swallow & R. Winston

  5. Department of Physics and Astronomy, University of Edinburgh, JCMB King’s Buildings, Mayfield Road, Edinburgh, EH9 3JZ, UK

    P. Rubin & A. Walker

  6. Dipartimento di Fisica dell’Università e Sezione dell’INFN di Ferrara, 44100, Ferrara, Italy

    W. Baldini, A. Cotta Ramusino, P. Dalpiaz, C. Damiani, M. Fiorini, A. Gianoli, M. Martini, F. Petrucci, M. Savrié, M. Scarpa & H. Wahl

  7. Dipartimento di Fisica dell’Università e Sezione dell’INFN di Firenze, 50125, Firenze, Italy

    A. Bizzeti, M. Calvetti,  E. Celeghini, E. Iacopini, M. Lenti, F. Martelli, G. Ruggiero & M. Veltri

  8. Institut für Physik, Universität Mainz, 55099, Mainz, Germany

    M. Behler, K. Eppard, K. Kleinknecht, P. Marouelli, L. Masetti, U. Moosbrugger, C. Morales Morales, B. Renk, M. Wache, R. Wanke & A. Winhart

  9. Department of Physics and Astronomy, Northwestern University, Evanston, Illinois, 60208-3112, USA

    D. Coward, A. Dabrowski, T. Fonseca Martin, M. Shieh, M. Szleper,  M. Velasco & M.D. Wood

  10. Dipartimento di Fisica dell’Università e Sezione dell’INFN di Perugia, 06100, Perugia, Italy

    G. Anzivino, P. Cenci, E. Imbergamo, A. Nappi, M. Pepe, M.C. Petrucci, M. Piccini, M. Raggi & M. Valdata-Nappi

  11. Dipartimento di Fisica dell’Università, Scuola Normale Superiore e Sezione dell’INFN di Pisa, 56100, Pisa, Italy

    C. Cerri, G. Collazuol, F. Costantini, L. DiLella, N. Doble, R. Fantechi, L. Fiorini, S. Giudici, G. Lamanna, I. Mannelli, A. Michetti, G. Pierazzini & M. Sozzi

  12. DSM/DAPNIA – CEA Saclay, 91191, Gif-sur-Yvette, France

    B. Bloch-Devaux, C. Cheshkov, J.B. Chèze, M. De Beer, J. Derré, G. Marel, E. Mazzucato, B. Peyaud & B. Vallage

  13. Fachbereich Physik, Universität Siegen, 57068, Siegen, Germany

    M. Holder & M. Ziolkowski

  14. Dipartimento di Fisica Sperimentale dell’Università e Sezione dell’INFN di Torino, 10125, Torino, Italy

    S. Bifani, C. Biino, N. Cartiglia, M. Clemencic, S. Goy Lopez & F. Marchetto

  15. Institut für Hochenergiephysik, Österreichische Akademie der Wissenschaften, 10560, Wien, Austria

    H. Dibon, M. Jeitler, M. Markytan, I. Mikulec, G. Neuhofer &  L. Widhalm

  16. Istituto di Cosmogeofisica del CNR di Torino, 10133, Torino, Italy

    D. Cundy

  17. Scuola Normale Superiore and INFN, 56100, Pisa, Italy

    E. Goudzovski & G. Ruggiero

  18. CERN, 1211, Genève 23, Switzerland

    P. Hristov, T. Fonseca Martin, C. Cheshkov & M. Clemencic

  19. Centre de Physique des Particules de Marseille, IN2P3-CNRS, Université de la Méditerranée, Marseille, France

    E. Monnier

  20. Istituto di Fisica, Università di Modena, 41100, Modena, Italy

    A. Bizzeti

  21. Istituto di Fisica, Università di Urbino, 61029, Urbino, Italy

    F. Martelli & M. Veltri

  22. Physikalisches Institut, Universität Bonn, 53115, Bonn, Germany

    L. Masetti & D. Coward

  23. UCLA, Los Angeles, CA, 90024, USA

    M.D. Wood

Authors
  1. J.R. Batley
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  2. A.J. Culling
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  3. G. Kalmus
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  4. C. Lazzeroni
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  20. M. Patel
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  22. S. Balev
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  40. A. Walker
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Correspondence to E. Goudzovski.

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Batley, J., Culling, A., Kalmus, G. et al. Search for direct CP violating charge asymmetries in K±→π±π+π- and K±→π±π0π0 decays. Eur. Phys. J. C 52, 875–891 (2007). https://doi.org/10.1140/epjc/s10052-007-0456-7

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  • DOI: https://doi.org/10.1140/epjc/s10052-007-0456-7

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