Observation of the decay K-S -> pi(+)pi(-)e(+)e(-)
- Lai A
- Marras D
- Musa L
- Bevan A
- Dosanjh RS
- Gershon TJ
- Hay B
- Kalmus GE
- Munday DJ
- Needham MD
- Olaiya E
- Parker MA
- White TO
- Wotton SA
- Barr G
- Blumer H
- Bocquet G
- Ceccucci A
- Cundy D
- D'Agostini G
- Doble N
- Falaleev V
- Gatignon L
- Gonidec A
- Govi G
- Grafstrom P
- Kubischta W
- Lacourt A
- Norton A
- Palestini S
- Panzer-Steindel B
- Peyaud B
- Taureg H
- Velasco M
- Wahl H
- Cheshkov C
- Hristov P
- Kekelidze V
- Madigojine D
- Mestvirishvili A
- Molokanova N
- Potrebenikov Y
- Tatishvili G
- Tkatchev A
- Zinchenko A
- Knowles I
- Martin V
- Parsons H
- Sacco R
- Lazzeroni C
- Walker A
- Contalbrigo M
- Dalpiaz P
- Duclos J
- Frabetti PL
- Gianoli A
- Martini H
- Petrucci F
- Savrie M
- Bizzeti A
- Calvetti M
- Collazuol G
- Graziani G
- Iacopini E
- Lenti M
- Becker HG
- Eppard M
- Fox H
- Holtz K
- Kalter A
- Kleinknecht K
- Koch U
- Kopke L
- Pellmann I
- Peters A
- Renk B
- Schmidt SA
- Schonharting V
- Schue Y
- Winhart A
- Wittgen M
- Chollet JC
- Crepe S
- Fayard L
- Iconomidou-Fayard L
- Ocariz J
- Unal G
- Wingerter-Seez I
- Anzivino G
- Cenci P
- Imbergamo E
- Lubrano P
- Nappi A
- Pepe M
- Piccini M
- Carosi R
- Casali R
- Cerri C
- Cirilli M
- Costantini F
- Fantechi R
- Giudici S
- Gorini B
- Mannelli I
- Pierazzini G
- Sozzi M
- Cheze JB
- Cogan J
- De Beer M
- Debu P
- Formica A
- de Cassagnac RG
- Mazzucato E
- Turlay R
- Vallage B
- Augustin I
- Bender M
- Holder M
- Ziolkowski M
- Arcidiacono R
- Biino C
- Marchetto F
- Menichetti E
- Pastrone N
- Nassalski J
- Rondio E
- Szleper M
- Wislicki W
- Wronka S
- Dibon H
- Fischer G
- Jeitler M
- Markytan M
- Mikulec I
- Neuhofer G
- Pernicka M
- Taurok A
DOIAbstract
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
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