Observation of the rare decay K_S --> pi0 e+ e-
- BATLEY JR
- KALMUS GE
- LAZZERONI C
- MUNDAY DJ
- PATEL M
- SLATER MW
- WOTTON SA
- ARCIDIACONO R
- BOCQUET G
- CECCUCCI A
- CUNDY D
- DOBLE N
- FALALEEV V
- GATIGNON L
- GONIDEC A
- GRAFSTROM 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 Y
- STOYNEV S
- ZINCHENKO A
- MONNIER E
- SWALLOW E
- WINSTON R
- SACCO R
- WALKER A
- BALDINI W
- DALPIAZ P.
- FRABETTI PL
- GIANOLI A
- MARTINI M
- PETRUCCI F
- SCARPA M
- SAVRIE 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 CM
- PETERS A
- WANKE R
- WINHART A
- DABROWSKI A
- MARTIN TF
- LOPEZ SG
- VELASCO M
- ANZIVINO G
- CENCI P
- IMBERGAMO E
- LAMANNA G
- LUBRANO P
- MICHETTI A
- NAPPI A
- PEPE M
- PETRUCCI MC
- PICCINI M
- VALDATA M
- CERRI C
- COSTANTINI F
- FANTECHI R
- FIORINI L
- GIUDICI S
- MANNELLI I
- PIERAZZINI G
- SOZZI M
- CHESHKOV C
- CHEZE JB
- 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
DOIAbstract
A search for the decay K_S --> pi0 e+ 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(K_S --> pi0 e+ e-, m_{ee}>0.165 GeV/c^2)=(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(K_S --> pi0 e+ e-)=(5.8+2.9−2.4)×10−9
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