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	Author	NA48/2 Collaboration (Batley, J.R. et al); Fiorini, L.
	Title	First observation and study of the K± → π0 π0 μ± ν decay			Type	Journal Article
	Year	2024	Publication	Journal of High Energy Physics	Abbreviated Journal	J. High Energy Phys.
	Volume	03	Issue	3	Pages	137 - 18pp
	Keywords	Branching fraction; Fixed Target Experiments; Rare Decay
	Abstract	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.
	Address	[Batley, J. R.; Kalmus, G.; Lazzeroni, C.; Munday, D. J.; Slater, M. W.; Wotton, S. A.] Univ Cambridge, Cavendish Lab, Cambridge, England
	Corporate Author				Thesis
	Publisher	Springer	Place of Publication		Editor
	Language	English	Summary Language		Original Title
	Series Editor		Series Title		Abbreviated Series Title
	Series Volume		Series Issue		Edition
	ISSN	1029-8479	ISBN		Medium
	Area		Expedition		Conference
	Notes	WOS:001192143600001			Approved	no
	Is ISI	yes	International Collaboration	yes
	Call Number	IFIC @ pastor @			Serial	6347
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