Precise measurements of the K_S --> gamma gamma and K_L --> gamma gamma decay rates
- LAI A
- MARRAS D
- BATLEY JR
- DOSANJH RS
- GERSHON TJ
- KALMUS GE
- LAZZERONI C
- MUNDAY DJ
- OLAIYA E
- PARKER MA
- WHITE TO
- WOTTON SA
- ARCIDIACONO R
- BARR G
- BOCQUET G
- CECCUCCI A
- CUHADAR-DOSZELMANN T
- CUNDY D
- DOBLE N
- FALALEEV V
- GATIGNON L
- GONIDEC A
- GORINI B
- GRAFSTROM P
- KUBISCHTA W
- LACOURT A
- MIKULEC I
- NORTON A
- PANZER-STEINDEL B
- TATISHVILI G
- WAHL H
- CHESHKOV C
- HRISTOV P
- KEKELIDZE V
- MADIGOJINE D
- MOLOKANOVA N
- POTREBENIKOV Y
- ZINCHENKO A
- MARTIN V
- RUBIN P
- 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
- EPPARD M
- HIRSTIUS A
- HOLTZ K
- KLEINKNECHT K
- KOCH U
- KOPKE L
- DA SILVA PL
- MAROUELLI P
- MESTVIRISHVILI I
- PELLMANN I
- PETERS A
- SCHMIDT SA
- SCHOHARTING V
- SCHUE Y
- WANKE R
- WINHART A
- WITTGEN M
- CHOLLET JC
- FAYARD L
- ICONOMIDOU-FAYARD L
- UNAL G
- WINGERTER-SEEZ I
- ANZIVINO G
- CENCI P
- IMBERGAMO E
- LUBRANO P
- MESTVIRISHVILI A
- NAPPI A
- PEPE M
- PICCINI M
- CASALI R
- CERRI C
- CIRILLI M
- COSTANTINI F
- FANTECHI R
- FIORINI L
- GIUDICI S
- MANNELLI I
- PIERAZZINI G
- SOZZI M
- CHEZE JB
- DE BEER M
- DEBU P
- DERUE F
- FORMICA A
- DE CASSAGNAC RG
- GOUGE G
- MAREL G
- MAZZUCATO E
- PEYAUD B
- TURLAY R
- VALLAGE B
- HOLDER M
- MAIER A
- ZIOLKOWSKI M
- BIINO C
- CARTIGLIA N
- MARCHETTO F
- MENICHETTI E
- PASTRONE N
- NASSALSKI J
- RONDIO E
- SZLEPER M
- WISLICKI W
- WRONKA S
- DIBON H
- JEITLER M
- MARKYTAN M
- NEUHOFER G
- PERNICKA M
- TAUROK A
- WIDHALM L
DOIAbstract
The K_S --> gamma gamma decay rate has been measured with the NA48 detector using a high intensity short neutral beam from the CERN SPS. The measured branching ratio BR(K_S --> gamma gamma)=(2.78±0.06stat±0.04syst)×10−6, obtained from 7461±172 K_S --> gamma gamma, is significantly higher than the O(p4) prediction of chiral perturbation theory. Using a KL beam the ratio Gamma(K_L --> gamma gamma)/ Gamma(K_L --> pi0 pi0 pi0) = (2.81 +- 0.01stat +- 0.02syst) has been measured
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