Precision measurement of the Xi(0) mass and the branching ratios of the decays Xi(0) -> Lambda gamma and Xi(0) -> Sigma(0)gamma

FANTI, VIVIANA;Lai A;Marras D;Musa L;Nappi A;Hay B;Moore KN;Moore RW;Munday DJ;Needham MD;Parker MA;White TO;Wotton SA;Barr G;Blumer H;Bocquet G;Bremer J;Ceccucci A;Cogan J;Cundy D;Doble N;Fischer G;Funk W;Gatignon L;Gianoli A;Gonidec A;Govi G;Grafstrom P;Lacourt A;Luitz S;Marzulli V;Matheys JP;Norton A;Palestini S;Panzer Steindel B;Schinzel D;Taureg H;Velasco M;Vossnack O;Wahl H;Wirrer G;Gaponenko A;Kekelidze V;Madigojine D;Mestvirishvili A;Molokanova N;Potrebenikov Y;Tatishvili G;Tkatchev A;Zinchenko A;Boyle O;Knowles IG;Martin VJ;Parsons H;Contalbrigo M;Dalpiaz P;Duclos J;Formica A;Frabetti PL;Martini M;Petrucci F;Savrie M;Bizzeti A;Calvetti M;Collazuol G;Graziani G;Iacopini E;Lenti M;Michetti A;Talamonti C;Becker HG;Coward D;Ebersberger C;Fox H;Kalter A;Kleinknecht K;Koch U;Kopke L;Renk B;Scheidt J;Schmidt J;Schue Y;Schonharting V;Wilhelm R;Wittgen M;Chollet JC;Crepe S;Fayard L;Iconomidou Fayard L;Ocariz J;Unal G;Wingerter I;Anzivino G;Cenci P;Lubrano P;Pepe M;Calafiura P;Carosi R;Casali R;Cerri C;Cirilli M;Costantini F;Fantechi R;Giudici S;Gorini B;Mannelli I;Pierazzini G;Sozzi M;Cheze JB;De Beer M;Debu P;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;Cester R;Marchetto F;Menichetti E;Pastrone N;Nassalski J;Rondio E;Szleper M;Wislicki W;Wronka S;Dibon H;Jeitler M;Markytan M;Mikulec I;Neuhofer G;Pernicka M;Taurok A.

2000-01-01

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Abstract

A new precision measurement of the Xi(0) mass has been performed at the NA48 experiment at the CERN SPS. The value obtained is [1319.82+/-0.06 (stat.) +/-0.2 (syst.)] MeV/c(2). The branching ratios of Xi(0) radiative decays have been measured as: Br(Xi --> Lambda gamma) = [1.90 +/- 0.34(stat.) +/- 0.19(syst.)].10(-3) and Br(Xi --> Sigma(0)gamma) = [3.14 +/- 0.76(stat.) +/- 0.32(syst.).10(-3).