First observation and study of the $K^± → π^0π^0μ^±ν$ decay

https://devfeature-collection.sl.nsw.gov.au/record/TN_cdi_osti_scitechconnect_2403640

First observation and study of the $K^± → π^0π^0μ^±ν$ decay

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Batley, J. R. , Lazzeroni, C. , Munday, D. J. , Slater, M. W. , Wotton, S. A. , Bocquet, G. , Ceccucci, A. , Cundy, D. , Falaleev, V. , Fidecaro, M. , Gatignon, L. , Gonidec, A. , Kubischta, W. , Maier, A. , Norton, A. , Patel, M. , Peters, A. , Monnier, E. , Swallow, E. , Winston, R. , Rubin, P. , Dalpiaz, P. , Damiani, C. , Fiorini, M. , Martini, M. , Petrucci, F. , Savrié, M. , Scarpa, M. , Wahl, H. , Baldini, W. , Cotta Ramusino, A. , Gianoli, A. , Calvetti, M. , Celeghini, E. , Lenti, M. , Ruggiero, G. , Bizzeti, A. , Veltri, M. , Behler, M. , Eppard, K. , Hita-Hochgesand, M. , Kleinknecht, K. , Marouelli, P. , Moosbrugger, U. , Morales Morales, C. , Renk, B. , Wache, M. , Winhart, A. , Coward, D. , Dabrowski, A. , Fonseca Martin, T. , Shieh, M. , Szleper, M. , Velasco, M. , Wood, M. D. , Imbergamo, E. , Nappi, A. , Piccini, M. , Raggi, M. , Valdata-Nappi, M. , Pepe, M. , Petrucci, M. C. , Costantini, F. , Doble, N. , Fiorini, L. , Sozzi, M. , Venditti, S. , Di Lella, L. , Lamanna, G. , Mannelli, I. , Michetti, A. , Cerri, C. , Bloch-Devaux, B. , Cheshkov, C. , De Beer, M. , Derré, J. , Marel, G. , Mazzucato, E. , Peyaud, B. , Vallage, B. , Holder, M. , Bifani, S. , Biino, C. , Cartiglia, N. , Marchetto, F. , Dibon, H. , Jeitler, M. , Markytan, M. , Mikulec, I. , Balev, S. , Gersabeck, E. , Hristov, P. , Korotkova, A. , Kozhuharov, V. , Litov, L. , Molokanova, N. , Polenkevich, I. , Potrebenikov, Yu , Stoynev, S. , Zinchenko, A. , SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States) and Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)

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United States: Springer Nature

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The journal of high energy physics, 2024-03, Vol.2024 (3)

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English

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United States: Springer Nature

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Abstract
The NA48/2 experiment at CERN reports the first observation of the K± → π0π0μ±ν 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/c4 is measured to be (0.65 ± 0.03) × 10−6. The extrapolation t...