학술논문

First observation and study of the K±→ π0π0μ±ν decay

Document Type

Original Paper

Author

; Batley, J. R.; Kalmus, G.; Lazzeroni, C.; Munday, D. J.; Slater, M. W.; Wotton, S. A.; Arcidiacono, R.; Bocquet, G.; Cabibbo, N.; 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.; Walker, A.; 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.; Iacopini, E.; Lenti, M.; Ruggiero, G.; Bizzeti, A.; Veltri, M.; Behler, M.; Eppard, K.; Hita-Hochgesand, M.; Kleinknecht, K.; Marouelli, P.; Masetti, L.; Moosbrugger, U.; Morales Morales, C.; Renk, B.; Wache, M.; Wanke, R.; Winhart, A.; Coward, D.; Dabrowski, A.; Fonseca Martin, T.; Shieh, M.; Szleper, M.; Velasco, M.; Wood, M. D.; Anzivino, G.; Imbergamo, E.; Nappi, A.; Piccini, M.; Raggi, M.; Valdata-Nappi, M.; Cenci, P.; Pepe, M.; Petrucci, M. C.; Costantini, F.; Doble, N.; Fiorini, L.; Giudici, S.; Pierazzini, G.; Sozzi, M.; Venditti, S.; Collazuol, G.; Di Lella, L.; Lamanna, G.; Mannelli, I.; Michetti, A.; Cerri, C.; Fantechi, R.; Bloch-Devaux, B.; Cheshkov, C.; Chèze, J. B.; De Beer, M.; Derré, J.; Marel, G.; Mazzucato, E.; Peyaud, B.; Vallage, B.; Holder, M.; Ziolkowski, M.; Bifani, S.; Clemencic, M.; Goy Lopez, S.; Biino, C.; Cartiglia, N.; Marchetto, F.; Dibon, H.; Jeitler, M.; Markytan, M.; Mikulec, I.; Neuhofer, G.; Widhalm, L.; Balev, S.; Frabetti, P. L.; Gersabeck, E.; Goudzovski, E.; Hristov, P.; Kekelidze, V.; Korotkova, A.; Kozhuharov, V.; Litov, L.; Madigozhin, D.; Molokanova, N.; Polenkevich, I.; Potrebenikov, Yu.; Stoynev, S.; Zinchenko, A.

Source

Journal of High Energy Physics. 2024(3)

Subject

Branching fraction
Fixed Target Experiments
Rare Decay

Language

English

ISSN

1029-8479

Abstract

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 to the full kinematic space, using a specific model, is found to be (3.45 ± 0.16) × 10−6, in agreement with chiral perturbation theory predictions.

Online Access

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