Observation of the K+→π+νν¯ decay and measurement of its branching ratio

dc.contributor.author	The NA62 collaboration
dc.date.accessioned	2026-03-30T07:33:49Z
dc.date.available	2026-03-30T07:33:49Z
dc.date.issued	2025
dc.identifier.issn	10298479
dc.identifier.other	DOI 10.1007/JHEP02(2025)191
dc.identifier.uri	http://repository.enu.kz/handle/enu/30908
dc.description.abstract	A measurement of the K+→π+νν¯ decay by the NA62 experiment at the CERN SPS is presented, using data collected in 2021 and 2022. This dataset was recorded, after modifications to the beamline and detectors, at a higher instantaneous beam intensity with respect to the 2016–2018 data taking. Combining NA62 data collected in 2016–2022, a measurement of BK+→π+νν¯=13.0−3.0+3.3×10−11 is reported. With 51 signal candidates observed and an expected background of 18−2+3 events, BK+→π+νν¯ becomes the smallest branching ratio measured with a signal significance above 5σ.	ru
dc.language.iso	en	ru
dc.publisher	Journal of High Energy Physics	ru
dc.relation.ispartofseries	Volume 2025 Issue 2 Article number 191;
dc.subject	Branching fraction	ru
dc.subject	Flavour Physics	ru
dc.subject	Other Experiments	ru
dc.subject	Rare Decay	ru
dc.title	Observation of the K+→π+νν¯ decay and measurement of its branching ratio	ru
dc.type	Article	ru