First observation and study of the K ⁰⁰ decay

J. R. Batley,G. Kalmus, C. Lazzeroni,D. J. Munday, M. W. Slater,S. A. Wotton,R. Arcidiacono,G. Bocquet,N. Cabibbo,A. Ceccucci,D. Cundy,V. Falaleev,M. Fidecaro,L. Gatignon,A. Gonidec,W. Kubischta,A. Maier,A. Norton,M. Patel,A. Peters,E. Monnier,E. Swallow,R. Winston,P. Rubin,A. Walker,P. Dalpiaz,C. Damiani,M. Fiorini,M. Martini,F. Petrucci,M. Savrie,M. Scarpa,H. Wahl,W. Baldini,A. Cotta Ramusino,A. Gianoli,M. Calvetti,E. Celeghini,E. Iacopini,M. Lenti,G. Ruggiero,A. Bizzeti,M. Veltri,M. Behler,K. Eppard,M. Hita-Hochgesand,K. Kleinknecht,P. Marouelli,L. Masetti,U. Moosbrugger,C. Morales Morales,B. Renk,M. Wache,R. Wanke,A. Winhart,D. Coward,A. Dabrowski,T. Fonseca Martin,M. Shieh,M. Szleper,M. Velasco,M. D. Wood,G. Anzivino,E. Imbergamo,A. Nappi,M. Piccini,M. Raggi,M. Valdata-Nappi,P. Cenci,M. Pepe,M. C. Petrucci,F. Costantini,N. Doble,L. Fiorini,S. Giudici,G. Pierazzini,M. Sozzi,S. Venditti,G. Collazuol,L. Di Lella,G. Lamanna,I. Mannelli,A. Michetti,C. Cerri,R. Fantechi,B. Bloch-Devaux,C. Cheshkov,J. B. Cheze,M. De Beer,J. Derre,G. Marel,E. Mazzucato,B. Peyaud,B. Vallage,M. Holder,M. Ziolkowski,S. Bifani,M. Clemencic,S. Goy Lopez,C. Biino,N. Cartiglia,F. Marchetto,H. Dibon,M. Jeitler,M. Markytan,I. Mikulec,G. Neuhofer,L. Widhalm,S. Balev,P. L. Frabetti,E. Gersabeck,E. Goudzovski,P. Hristov,V. Kekelidze,A. Korotkova,V. Kozhuharov,L. Litov,D. Madigozhin,N. Molokanova,I. Polenkevich,Yu. Potrebenikov,S. Stoynev,A. Zinchenko

JOURNAL OF HIGH ENERGY PHYSICS（2024）

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摘要

The NA48/2 experiment at CERN reports the first observation of the K-+/- -> pi(0)pi(0)mu(+/-)nu decay based on a sample of 2437 candidates with 15% background contamination collected in 2003-2004. The decay branching ratio in the kinematic region of the squared dilepton mass above 0.03 GeV2/c(4) is measured to be (0.65 +/- 0.03) x 10(-6). The extrapolation to the full kinematic space, using a specific model, is found to be (3.45 +/- 0.16) x 10(-6), in agreement with chiral perturbation theory predictions.

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关键词

Branching fraction,Fixed Target Experiments,Rare Decay

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First observation and study of the K 00 decay

First observation and study of the K ⁰⁰ decay