Data di Pubblicazione:
2000
Abstract:
We present the first observation of the decay K-S -> pi (+)pi (-)e(+)e(-) based upon the data collected in 1998 by the NA48 experiment at CERN. We have identified a clean sample of 56 events with negligible background contamination. Using K-L -> pi (+)pi (-)pi (0)(D) decays as normalization sample, the branching ratio is measured to be BR(K-S -> pi (+)pi (-)e(+)e(-)) = [4.5 +/- 0.7(stat) +/- 0.4(syst)] x 10(-5). This result is in good agreement with the theoretical expectations from the mechanism of inner bremsstrahlung. (C) 2000 Elsevier Science B.V. All rights reserved.
Tipologia CRIS:
03A-Articolo su Rivista
Keywords:
NA48 EXPERIMENT; CP VIOLATION
Elenco autori:
A. Lai;D. Marras;L. Musa;A. Bevan;R. S. Dosanjh;T. J. Gershon;B. Hay;G. E. Kalmus;D. J. Munday;M. D. Needham;E. Olaiya;M. A. Parker;T. O. White;S. A. Wotton;G. Barr;H. Blumer;G. Bocquet;A. Ceccucci;D. Cundy;G. D'Agostini;N. Doble;V. Falaleev;L. Gatignon;A. Gonidec;G. Govi;P. Grafstrom;W. Kubischta;A. Lacourt;A. Norton;S. Palestini;B. Panzer-Steindel;B. Peyaud;H. Taureg;M. Velasco;H. Wahl;C. Cheshkov;P. Hristov;V. Kekelidze;D. Madigojine;A. Mestvirishvili;N. Molokanova;Y. Potrebenikov;G. Tatishvili;A. Tkatchev;A. Zinchenko;I. Knowles;V. Martin;H. Parsons;R. Sacco;C. Lazzeroni;A. Walker;M. Contalbrigo;P. Dalpiaz;J. Duclos;P. L. Frabetti;A. Gianoli;H. Martini;F. Petrucci;M. Savrie;A. Bizzeti;M. Calvetti;G. Collazuol;G. Graziani;E. Iacopini;M. Lenti;H. G. Becker;M. Eppard;H. Fox;K. Holtz;A. Kalter;K. Kleinknecht;U. Koch;L. Kopke;I. Pellmann;A. Peters;B. Renk;S. A. Schmidt;V. Schonharting;Y. Schue;A. Winhart;M. Wittgen;J. C. Chollet;S. Crepe;L. Fayard;L. Iconomidou-Fayard;J. Ocariz;G. Unal;I. Wingerter-Seez;G. Anzivino;P. Cenci;E. Imbergamo;P. Lubrano;A. Nappi;M. Pepe;M. Piccini;R. Carosi;R. Casali;C. Cerri;M. Cirilli;F. Costantini;R. Fantechi;S. Giudici;B. Gorini;I. Mannelli;G. Pierazzini;M. Sozzi;J. B. Cheze;J. Cogan;M. D. Beer;P. Debu;A. Formica;R. G. de;E. Mazzucato;R. Turlay;B. Vallage;I. Augustin;M. Bender;M. Holder;M. Ziolkowski;R. Arcidiacono;C. Biino;F. Marchetto;E. Menichetti;N. Pastrone;J. Nassalski;E. Rondio;M. Szleper;W. Wislicki;S. Wronka;H. Dibon;G. Fischer;M. Jeitler;M. Markytan;I. Mikulec;G. Neuhofer;M. Pernicka;A. Taurok
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