학술논문

First observation and study of the K ± → π 0 π 0 μ ± ν decay
Document Type
article
Author
The NA48/2 collaborationJ. R. BatleyG. KalmusC. LazzeroniD. J. MundayM. W. SlaterS. A. WottonR. ArcidiaconoG. BocquetN. CabibboA. CeccucciD. CundyV. FalaleevM. FidecaroL. GatignonA. GonidecW. KubischtaA. MaierA. NortonM. PatelA. PetersE. MonnierE. SwallowR. WinstonP. RubinA. WalkerP. DalpiazC. DamianiM. FioriniM. MartiniF. PetrucciM. SavriéM. ScarpaH. WahlW. BaldiniA. Cotta RamusinoA. GianoliM. CalvettiE. CeleghiniE. IacopiniM. LentiG. RuggieroA. BizzetiM. VeltriM. BehlerK. EppardM. Hita-HochgesandK. KleinknechtP. MarouelliL. MasettiU. MoosbruggerC. Morales MoralesB. RenkM. WacheR. WankeA. WinhartD. CowardA. DabrowskiT. Fonseca MartinM. ShiehM. SzleperM. VelascoM. D. WoodG. AnzivinoE. ImbergamoA. NappiM. PicciniM. RaggiM. Valdata-NappiP. CenciM. PepeM. C. PetrucciF. CostantiniN. DobleL. FioriniS. GiudiciG. PierazziniM. SozziS. VendittiG. CollazuolL. Di LellaG. LamannaI. MannelliA. MichettiC. CerriR. FantechiB. Bloch-DevauxC. CheshkovJ. B. ChèzeM. De BeerJ. DerréG. MarelE. MazzucatoB. PeyaudB. VallageM. HolderM. ZiolkowskiS. BifaniM. ClemencicS. Goy LopezC. BiinoN. CartigliaF. MarchettoH. DibonM. JeitlerM. MarkytanI. MikulecG. NeuhoferL. WidhalmS. BalevP. L. FrabettiE. GersabeckE. GoudzovskiP. HristovV. KekelidzeA. KorotkovaV. KozhuharovL. LitovD. MadigozhinN. MolokanovaI. PolenkevichYu. PotrebenikovS. StoynevA. Zinchenko
Source
Journal of High Energy Physics, Vol 2024, Iss 3, Pp 1-18 (2024)
Subject
Branching fraction
Fixed Target Experiments
Rare Decay
Nuclear and particle physics. Atomic energy. Radioactivity
QC770-798
Language
English
ISSN
1029-8479
Abstract
Abstract The NA48/2 experiment at CERN reports the first observation of the K ± → π 0 π 0 μ ± 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/c 4 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.