MEASUREMENT OF THE DECAY-RATE AND THE PARAMETER ALPHA(K)ASTERISK OF THE DECAY K-L-]MU-MU-GAMMA

Authors
FANTI V 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 PANZERSTEINDEL B TAUREG H VELASCO M VOSSNACK O WAHL H KEKELIDZE V KOJEVNIKOV I POTREBENIKOV I TATICHVILI G TKATCHEV A BERTOLOTTO L BOYLE O HAY B MCKAY 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 SIMANI 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 KOPKE L LEBER F LUITZ S RENK B SCHEIDT J SCHMIDT J SCHONHARTING V WILHELM R ZEITNITZ O CHOLLET JC CREPE S 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 DEBEER M DEBU P HRISTOV P MAZZUCATO E PEYAUD B SCHANNE S STEINKAMP O TURLAY R VALLAGE B AUGUSTIN I BENDER M HOLDER M SCHWARZE I ZIOLKOWSKI M ARCIDIACONO R BIINO C GOVI G MAAS P MARCHETTO F MENICHETTI E DIBON H JEITLER M MARKYTAN M MIKULEC I NEUHOFER G PERNICKA M TAUROK A
Citation
V. Fanti et al., MEASUREMENT OF THE DECAY-RATE AND THE PARAMETER ALPHA(K)ASTERISK OF THE DECAY K-L-]MU-MU-GAMMA, Zeitschrift fur Physik. C, Particles and fields, 76(4), 1997, pp. 653-657
Citations number
12
Journal title
Zeitschrift fur Physik. C, Particles and fields → ACNP
ISSN journal
01709739
Volume
76
Issue
4
Year of publication
1997
Pages
653 - 657
Database
ISI
SICI code
0170-9739(1997)76:4<653:MOTDAT>2.0.ZU;2-1
Abstract
The rate of the decay of the neutral K meson into K-L(0) --> mu mu gam ma has been measured with the NA48 detector at the CERN SPS, Pi total of 59 events has been observed with an estimated background of 14 even ts. The overall Kaon flux was determined to he 1.2 x 10(9), This obser vation corresponds to a branching ratio of (3.4 +/- 0.6(stat) +/- 0.4( sys)) x 10(-7) Using this branching ratio the parameter alpha(K) desc ribing the relative strength of the two contributing amplitudes to thi s decay, through intermediate pseudoscalar or vectorlike mesons, was m easured to be alpha(K) = -0.04(-0.21)(+0.24).