Observation of the rare decay KS → π0e +e-

J. R. Batley*, G. E. Kalmus, C. Lazzeroni, D. J. Munday, M. Patel, M. W. Slater, S. A. Wotton, R. Arcidiacono, G. Bocquet, A. Ceccucci, D. Cundy, N. Doble, V. Falaleev, L. Gatignon, A. Gonidec, P. Grafström, W. Kubischta, F. Marchetto, I. Mikulec, A. NortonB. Panzer-Steindel, P. Rubin, H. Wahl, E. Goudzovski, D. Gurev, P. Hristov, V. Kekelidze, L. Litov, D. Madigozhin, N. Molokanova, Y. Potrebenikov, S. Stoynev, A. Zinchenko, E. Monnier, E. Swallow, R. Winston, R. Sacco, A. Walker, W. Baldini, P. Dalpiaz, P. L. Frabetti, A. Gianoli, M. Martini, F. Petrucci, M. Scarpa, M. Savrié, A. Bizzeti, M. Calvetti, G. Collazuol, G. Graziani, E. Iacopini, M. Lenti, F. Martelli, G. Ruggiero, M. Veltri, M. Behler, K. Eppard, M. Eppard, A. Hirstius, K. Kleinknecht, U. Koch, L. Masetti, P. Marouelli, U. Moosbrugger, C. Morales Morales, A. Peters, R. Wanke, A. Winhart, A. Dabrowski, T. Fonseca Martin, S. Goy Lopez, Mayda Velasco, G. Anzivino, P. Cenci, E. Imbergamo, G. Lamanna, P. Lubrano, A. Michetti, A. Nappi, M. Pepe, M. C. Petrucci, M. Piccini, M. Valdata, C. Cerri, F. Costantini, R. Fantechi, L. Fiorini, S. Giudici, I. Mannelli, G. Pierazzini, M. Sozzi, C. Cheshkov, J. B. Cheze, M. de Beer, P. Debu, G. Gouge, G. Marel, E. Mazzucato, B. Peyaud, B. Vallage, M. Holder, A. Maier, M. Ziolkowski, C. Biino, N. Cartiglia, M. Clemencic, E. Menichetti, N. Pastrone, W. Wislicki, H. Dibon, M. Jeitler, M. Markytan, G. Neuhofer, L. Widhalm

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

66 Scopus citations

Abstract

A search for the decay KS → π0e +e- has been made by the NA48/1 experiment at the CERN SPS accelerator. Using data collected during 89 days in 2002 with a high-intensity KS beam, 7 events were found with a background of 0. 15 events. The branching fraction BR(KS → π0e +e-, mee > 0.165 GeV/c2) = (3.0-1.2+1.5(stat)±0.2(syst)) × 10 -9 has been measured. Using a vector matrix element and a form factor equal to one, the measurement gives BR(KS → π 0e+e-) = (5.8-2.4+2.9) × 10-9.

Original languageEnglish (US)
Pages (from-to)43-54
Number of pages12
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume576
Issue number1-2
DOIs
StatePublished - Dec 4 2003

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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