First observation and study of the $K^{\pm} \rightarrow \pi^{0} \pi^{0} \mu^{\pm} \nu$ decay

A. Bizzeti; A. Ceccucci; A. Cotta Ramusino; A. Dabrowski; A. Gianoli; A. Gonidec; A. Korotkova; A. Maier; A. Michetti; A. Nappi

arxiv: 2310.20295 · v2 · pith:DHD425O2new · submitted 2023-10-31 · ✦ hep-ex

First observation and study of the K^(pm) rightarrow π⁰ π⁰ μ^(pm) ν decay

NA48/2 Collaboration: J. R. Batley , G. Kalmus , C. Lazzeroni , D. J. Munday , M. W. Slater , S. A. Wotton , R. Arcidiacono , A. Ceccucci

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G. Bocquet N. Cabibbo D. Cundy V. Falaleev L. Gatignon M. Fidecaro A. Gonidec W. Kubischta A. Maier A. Norton M. Patel A. Peters S. Balev P. L. Frabetti E. Gersabeck E. Goudzovski P. Hristov V. Kekelidze D. Madigozhin N. Molokanova I. Polenkevich Yu. Potrebenikov A. Korotkova S. Stoynev A. Zinchenko V. Kozhuharov L. Litov E. Monnier E. Swallow R. Winston P. Rubin A. Walker W. Baldini A. Cotta Ramusino P. Dalpiaz C. Damiani M. Fiorini A. Gianoli M. Martini F. Petrucci M. Savri\'e M. Scarpa H. Wahl A. Bizzeti M. Veltri M. Calvetti E. Celeghini E. Iacopini M. Lenti G. Ruggiero M. Behler K. Eppard M. Hita-Hochgesand K. Kleinknecht P. Marouelli L. Masetti U. Moosbrugger C. Morales Morales B. Renk M. Wache A. Winhart R. Wanke D. Coward A. Dabrowski T. Fonseca Martin M. Shieh M. Szleper M. Velasco M. D. Wood P. Cenci M. Pepe M. C. Petrucci G. Anzivino E. Imbergamo A. Nappi M. Piccini M. Raggi M. Valdata-Nappi C. Cerri R. Fantechi G. Collazuol L. Di Lella G. Lamanna I. Mannelli A. Michetti F. Costantini N. Doble L. Fiorini S. Giudici G. Pierazzini M. Sozzi S. Venditti B. Bloch-Devaux B. Peyaud C. Cheshkov J. B. Ch\`eze M. De Beer J. Derr\'e G. Marel E. Mazzucato B. Vallage M. Holder M. Ziolkowski C. Biino N. Cartiglia F. Marchetto S. Bifani M. Clemencic S. Goy Lopez H. Dibon M. Jeitler M. Markytan I. Mikulec G. Neuhofer L. Widhalm

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keywords decayfirstkinematicobservationrightarrowtimesaboveagreement

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The NA48/2 experiment at CERN reports the first observation of the $K^{\pm} \rightarrow \pi^{0} \pi^{0} \mu^{\pm} \nu$ 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 $0.03$~GeV$^2/c^4$ is measured to be $(0.65 \pm 0.03) \times 10^{-6}$. The extrapolation to the full kinematic space, using a specific model, is found to be $(3.45 \pm 0.16) \times 10^{-6}$, in agreement with chiral perturbation theory predictions.

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First observation and study of the K^(pm) rightarrow π⁰ π⁰ μ^(pm) ν decay

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