First measurement of the rate K-L(0)->pi mu nu gamma RID C-6551-2009 RID A-4071-2012

Bender M;Augustin I;Holder M;Schwarze I;Ziolkowski M;FANTI, VIVIANA;Lai A;Musa L;Nappi A;Setzu MG;Moore RW;Munday DJ;Parker MA;Takach SF;White TO;Barr G;Bocquet G;Bremer J;Ceccucci A;Cogan J;Cundy D;Doble N;Fischer G;Funk W;Gatignon L;Gianoli A;Gonidec A;Grafstrom P;Kubischta W;Marzulli V;Kesseler G;Matheys JP;Norton A;Palestini S;Panzer Steindel B;Schinzel D;Taureg H;Velasco M;Vossnack O;Kekelidze V;Kojevnikov I;Potrebenikov I;Tatichvili G;Tkatchev A;Bertolotto L;Boyle O;Hay B;Mc Kay NE;Oakland G;Parsons H;Peach KJ;Talamonti C;Walker A;Dalpiaz P;Duclos J;Formica A;Frabetti PL;Martini M;Petrucci F;Porcu M;Rossi F;Savrie M;Siman C;Bizzeti A;Calvetti M;Lenti M;Michetti A;Becker HG;Beier T;Blumer H;Buchholz P;Coward D;Ebersberger C;Kalter A;Kleinknecht K;Koch U;Kipke L;Leber F;Luitz S;Renk B;Scheidt J;Schmidt J;Schonharting V;Wilhelm R;Zeitnitz O;Chollet JC;Crepe S;Fayard L;Iconomidou Fayard L;Ocariz J;Unal G;Anzivino G;Cenci P;Lubrano P;Pepe M;Calafiura P;Carosi R;Casali R;Cerri C;Costantini F;Fantechi R;Giudici S;Gorini B;Mannelli I;Pierazzini G;Sozzi M;Cheze JB;De Beer M;Debu P;Hristov P;Mazzucato E;Peyaud B;Schanne S;Steinkamp O;Turlay R;Vallage B;Arcidiacono R;Biino C;Govi G;Mass P;Marchetto F;Menichetti E;Dibon H;Jeitler M;Markytan M;Mikulec I;Neuhofer G;Pernicka M;Taurok A.

1998-01-01

---

Abstract

In a preliminary version of the NA48 experiment at the CERN SPS, in which an iron-scintillator sandwich calorimeter was used as a photon detector, the ratio of K-L --> pi mu nu gamma and K-L --> pi mu nu decays was measured. The branching ratio BR(K-L --> pi mu nu gamma,E-gamma*greater than or equal to 30 MeV)/(K-L --> pi mu nu) is found to be (2.08+/-0.17(-0.21)(+0.16)x10(-3), where the first error is statistical and the second systematic. The result is in agreement with theoretical predictions. (C) 1998 Elsevier Science B.V.