Observation of the rare decay KS→π0e+e−
- Batley, J.R
- Kalmus, G.E
- Lazzeroni, C
- Munday, D.J
- Patel, M
- Slater, M.W
- Wotton, S.A
- Arcidiacono, R
- Bocquet, G
- Ceccucci, A
- Cundy, D
- Doble, N
- Falaleev, V
- Gatignon, L
- Gonidec, A
- Grafström, P
- Kubischta, W
- Marchetto, F
- Mikulec, I
- Norton, A
- Panzer-Steindel, B
- Rubin, P
- Wahl, H
- Goudzovski, E
- Gurev, D
- Hristov, P
- Kekelidze, V
- Litov, L
- Madigozhin, D
- Molokanova, N
- Potrebenikov, Yu
- Stoynev, S
- Zinchenko, A
- Monnier, E
- Swallow, E
- Winston, R
- Sacco, R
- Walker, A
- Baldini, W
- Dalpiaz, P
- Frabetti, P.L
- Gianoli, A
- Martini, M
- Petrucci, F
- Scarpa, M
- Savrié, M
- Bizzeti, A
- Calvetti, M
- Collazuol, G
- Graziani, G
- Iacopini, E
- Lenti, M
- Martelli, F
- Ruggiero, G
- Veltri, M
- Behler, M
- Eppard, K
- Eppard, M
- Hirstius, A
- Kleinknecht, K
- Koch, U
- Masetti, L
- Marouelli, P
- Moosbrugger, U
- Morales Morales, C
- Peters, A
- Wanke, R
- Winhart, A
- Dabrowski, A
- Fonseca Martin, T
- Goy Lopez, S
- Velasco, M
- Anzivino, G
- Cenci, P
- Imbergamo, E
- Lamanna, G
- Lubrano, P
- Michetti, A
- Nappi, A
- Pepe, M
- Petrucci, M.C
- Piccini, M
- Valdata, M
- Cerri, C
- Costantini, F
- Fantechi, R
- Fiorini, L
- Giudici, S
- Mannelli, I
- Pierazzini, G
- Sozzi, M
- Cheshkov, C
- Cheze, J.B
- De Beer, M
- Debu, P
- Gouge, G
- Marel, G
- Mazzucato, E
- Peyaud, B
- Vallage, B
- Holder, M
- Maier, A
- Ziolkowski, M
- Biino, C
- Cartiglia, N
- Clemencic, M
- Menichetti, E
- Pastrone, N
- Wislicki, W
- Dibon, H
- Jeitler, M
- Markytan, M
- Neuhofer, G
- Widhalm, L
Publication date
December 2003
DOI Publisher
Elsevier B.V. ISSN
0370-2693 Citation count (estimate)
33Abstract
AbstractA 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+1.5−1.2(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→π0e+e−)=(5.8+2.9−2.4)×10−9
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