Observation of the rare decay KS→π0μ+μ−
Physics Letters B2004Vol. 599(3-4), pp. 197–211
Citations Over TimeTop 10% of 2004 papers
J. R. Batley, G. Kalmus, C. Lazzeroni, D.J. Munday, M. Patel, M. 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. Norton, B. Panzer-Steindel, P. Rubin, H. D. Wahl, E. Monnier, E. C. Swallow, R. Winston, E. Goudzovski, D. Gurev, P. Hristov, V. Kekelidze, V. Kozhuharov, L. Litov, D. Madigozhin, N. Molokanova, Yu. Potrebenikov, S. Stoynev, A. Zinchenko, R. Sacco, A. Walker, W. Baldini, P. Dalpiaz, J. Duclos, P.L. Frabetti, A. Gianoli, M. Martini, F. Petrucci, M. Scarpa, M. Savriè, A. Bizzeti, M. Calvetti, 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, M. Szleper, M. Velasco, G. Anzivino, P. Cenci, E. Imbergamo, G. Lamanna, P. Lubrano, A. Michetti, A. Nappi, M. Pepé, M.C. Petrucci, B. Pietrzyk, M. Valdata, C. Cerri, G. Collazuol, F. Costantini, R. Fantechi, L. Fiorini, S. Giudici, I. Mannelli, G. Pierazzini, M. Sozzi, C. Cheshkov, J.B. Chèze, M. De Beer, P. Debu, G. Gouge, G. Marel, E. Mazzucato, B. Peyaud, B. Vallage, M. Holder, A. Maier, M. Ziółkowski, C. Biino, N. Cartiglia, M. Clemencic, SYLVIA GOY LÓPEZ, E. Menichetti, N. Pastrone, W. Wiślicki, H. Dibon, M. Jeitler, M. Markytan, G. Neuhofer, L. Widhalm
Abstract
A search for the decay K_S -> pi^0mu^+mu^- has been made by the NA48/1 Collaboration at the CERN SPS accelerator. The data were collected during 2002 with a high-intensity K_S beam. Six events were found with a background expectation of 0.22^+0.18_-0.11 event. Using a vector matrix element and unit form factor, the measured branching ratio is B(K_S -> pi^0mu^+mu^-)=[2.9^+1.5_-1.2(stat)+/-0.2(syst)]x10^{-9}.
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