Data di Pubblicazione:
2002
Abstract:
The decay rate of K-L --> pi(o)gammagamma has been measured with the NA48 detector at the CERN SPS. A total of 2558 K-L --> pi(o)gammagamma candidates have been observed with a residual background of 3.2%. The branching ratio is determined to be (1.36 +/- 0.03((stat)) +/- 0.03((syst)) +/- 0.03((norm))) x 10(-6) and the vector coupling constant a(v) = -0.46 +/- 0.03((stat)) +/- 0.04((syst)). This result suggests that the CP-violation effects are dominating in the K-L --> pi(o)e(+)e(-) decay. An upper limit for the K-L --> pi(o)gammagamma decay rate in the two photon mass region m(gammagamma) < m(π)o is also given. (C) 2002 Published by Elsevier Science B.V.
Tipologia CRIS:
03A-Articolo su Rivista
Keywords:
CHIRAL PERTURBATION-THEORY; VECTOR-MESON EXCHANGE; K(L)->PI(0)GAMMA-GAMMA; K->PI-GAMMA-GAMMA; UNITARITY; KAON
Elenco autori:
A. Lai;D. Marras;A. Bevan;R. S. Dosanjh;T. J. Gershon;B. Hay;G. E. Kalmus;C. Lazzeroni;D. J. Munday;M. D. Needham;E. Olaiya;M. A. Parker;T. O. White;S. A. Wotton;G. Barr;G. Bocquet;A. Ceccucci;T. Cuhadar-Donszelmann;D. Cundy;G. D'Agostini;N. Doble;V. Falaleev;L. Gatignon;A. Gonidec;B. Gorini;G. Govi;P. Grafstrom;W. Kubischta;A. Lacourt;M. Lenti;S. Luitz;I. Mikulec;A. Norton;S. Palestini;B. Panzer-Steindel;G. Tatishvili;H. Taureg;M. Velasco;H. Wahl;C. Cheshkov;P. Hristov;V. Kekelidze;D. Madigojine;N. Molokanova;Y. Potrebenikov;A. Zinchenko;I. Knowles;V. Martin;R. Sacco;A. Walker;M. Contalbrigo;P. Dalpiaz;J. Duclos;P. L. Frabetti;A. Gianoli;M. Martini;F. Petrucci;M. Savrie;A. Bizzeti;M. Calvetti;G. Collazuol;G. Graziani;E. Iacopini;M. Veltri;H. G. Becker;M. Eppard;H. Fox;K. Holtz;A. Kalter;K. Kleinknecht;U. Koch;L. Kopke;P. L. da;P. Maruelli;I. Pellmann;A. Peters;B. Renk;S. A. Schmidt;V. Schonharting;Y. Schue;R. Wanke;A. Winhart;M. Wittgen;J. C. Chollet;L. Fayard;L. Iconomidou-Fayard;J. Ocariz;G. Unal;I. Wingerter-Seez;G. Anzivino;P. Cenci;E. Imbergamo;P. Lubrano;A. Mestvirishvili;A. Nappi;M. Pepe;M. Piccini;R. Carosi;R. Casali;C. Cerri;M. Cirilli;F. Costantini;R. Fantechi;S. Giudici;I. Mannelli;G. Pierazzini;M. Sozzi;J. B. Cheze;J. Cogan;M. D. Beer;P. Debu;A. Formica;R. G. de;E. Mazzucato;B. Peyaud;R. Turlay;B. Vallage;M. Holder;A. Maier;M. Ziolkowski;R. Arcidiacono;C. Biino;N. Cartiglia;M. Clemencic;F. Marchetto;E. Menichetti;N. Pastrone;J. Nassalski;E. Rondio;M. Szleper;W. Wislicki;S. Wronka;H. Dibon;G. Fischer;M. Jeitler;M. Markytan;G. Neuhofer;M. Pernicka;A. Taurok;L. Widhalm
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