Measurement of the ratio Gamma(K-L -> pi(+)pi(-))/Gamma(K-L -> pi(+/-)e(-/+)nu) and extraction of the CP violation parameter vertical bar eta(+-)vertical bar
- Lai A
- Marras D
- Bevan A
- Dosanjh RS
- Gershon TJ
- Hay B
- Kalmus GE
- Lazzeroni C
- Munday DJ
- Olaiya E
- Parker MA
- White TO
- Wotton SA
- Barr G
- Bocquet G
- Ceccucci A
- Cuhadar-Donszelmann T
- Cundy D
- D'Agostini G
- Doble N
- Falaleev V
- Gatignon L
- Gonidec A
- Gorini B
- Govi G
- Grafstrom P
- Kubischta W
- Lacourt A
- Norton A
- Palestini S
- Panzer-Steindel B
- Taureg H
- Velasco M
- Wahl H
- Cheshkov C
- Gaponenko A
- Hristov P
- Kekelidze V
- Litov L
- Madigozhin D
- Molokanova N
- Potrebenikov Y
- Stoynev S
- Tatishvili G
- Tkatchev A
- Zinchenko A
- Knowles I
- Martin V
- Sacco R
- Walker A
- Contalbrigo M
- Dalpiaz P
- Duclos J
- Frabetti PL
- Gianoli A
- Martini M
- Petrucci F
- Savrie M
- Bizzeti A
- Calvetti M
- Collazuol G
- Graziani G
- Iacopini E
- Lenti M
- Martelli F
- Veltri M
- Becker HG
- Eppard K
- Eppard M
- Fox H
- Kalter A
- Kleinknecht K
- Koch U
- Kopke L
- da Silva PL
- Marouelli P
- Pellmann I
- Peters A
- Renk B
- Schmidt SA
- Schonharting V
- Schue Y
- Wanke R
- Winhart A
- Wittgen M
- Chollet JC
- Fayard L
- Iconomidou-Fayard L
- Ocariz J
- Unal G
- Wingerter-Seez I
- Anzivino G
- Cenci P
- Imbergamo E
- Lubrano P
- Mestvirishvili A
- Nappi A
- Pepe A
- Piccini M
- Bertanza L
- Carosi R
- Cerri C
- Cirilli M
- Costantini F
- Fantechi R
- Giudici S
- Mannelli I
- Pierazzini G
- Sozzi M
- Cheze JB
- Cogan J
- De Beer M
- Debu P
- Formica A
- de Cassagnac RG
- Mazzucato E
- Peyaud B
- Turlay R
- Vallage B
- Holder M
- Maier A
- Ziolkowski M
- Arcidiacono R
- Biino C
- Cartiglia N
- Guida R
- 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
- Widhalm L
DOIAbstract
We present a measurement of the ratio of the decay rates Gamma(K-L -> pi(+)pi(-))/Gamma(K-L -> pi +/- e -/+nu), denoted as Gamma(K2 pi)/Gamma(Ke3). The analysis is based on data taken during a dedicated run in 1999 by the NA48 experiment at the CERN SPS. Using a sample of 47 000 K-2 pi and five million K-e3 decays, we find Gamma(K2 pi)/Gamma(Ke3) = (4.835 +/- 0.022stat. +/- 0.016syst.) x 10(-3). From this we derive the branching ratio of the CP violating decay K-L -> pi(+)pi(-) and the CP violation parameter vertical bar eta+-vertical bar. Excluding the CP conserving direct photon emission component K-L -> pi(+)pi(-)gamma, we obtain the results BR(K-L -> pi(+)pi(-)) = (1.941 +/- 0.019) x 10(-3) and vertical bar eta+-vertical bar = (2.223 +/...
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