The decay rate of the neutral K meson K-L --> e(+)e(-)gamma has been measured with the NA48 detector at the CERN SPS. A total of 6864 events has been observed with an estimated background of 10 events. The branching ratio is Gamma(K-L --> e(+)e(-)gamma)/Gamma(K-L --> all) = (1.06 +/- 0.02(stat) +/- 0.02(sys) +/- 0.04(calc)) X 10(-5). The parameter alpha(K*) describing the relative strength of the two contributing amplitudes to this decay through intermediate pseudoscalar or vector mesons was measured to be alpha(K*) = -0.36 +/- 0.06(stat) +/- 0.02(sys). (C) 1999 Published by Elsevier Science B.V. All rights reserved.
Autori interni: | |
Autori: | Fanti V; Lai A; Musa L; Marras D; Nappi A; Hay B; Moore RW; Moore KN; Munday DJ; Needham MD; Parker MA; White TO; Wotton SA; Barr G; Bocquet G; Bremer J; Ceccucci A; Cundy D; Doble N; Funk W; Gatignon L; Gianoli A; Gonidec A; Govi G; Grafstrom P; Kubischta W; Lacourt A; Luitz S; Kesseler G; Matheys JP; Norton A; Palestini S; Panzer-Steindel B; Schinzel D; Taureg H; Velasco M; Vossnack O; Wahl H; Wirrer G; Kekelidze V; Mestvirishvili A; Tatishvili G; Potrebenikov I; Tkatchev A; Zinchenko A; Boyle O; Martin VJ; Knowles IG; Parsons HLC; Dalpaiz P; Duclos J; Frabetti PL; Martini M; Petrucci F; Porcu M; Savrie M; Bizzeti A; Calvetti M; Collazuol G; Graziani G; Iacopini E; Lenti M; Michetti A; Becker HG; Blumer H; Buchholz P; Coward D; Ebersberger C; Fox H; Kalter A; Kleinknecht K; Koch U; Kopke L; Renk B; Scheidt J; Schmidt J; Schonharting V; Schue Y; Wilhelm R; Winhart A; Wittgen M; Chollet JC; Crepe S; Iconomidou-Fayard L; Fayard L; Ocariz J; Unal G; Vattolo D; Wingerter I; Anzivino G; Cenci P; Lubrano P; Pepe M; Gorini B; Calafiura P; 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; Hristov P; Mazzucato E; Peyaud B; Schanne S; Turlay R; Vallage B; Augustin I; Bender M; Holder M; Ziolkowski M; Arcidiacono R; Biino C; Marchetto F; Menichetti E; 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 |
Titolo: | Measurement of the decay rate and form factor parameter alpha(K*) in the decay K-L -> e(+)e(-)gamma |
Anno del prodotto: | 1999 |
Digital Object Identifier (DOI): | 10.1016/S0370-2693(99)00561-4 |
Appare nelle tipologie: | 1.1 Articolo in rivista |