NAGIOS: RODERIC FUNCIONANDO

First observation and study of the K± → π±π0e+e− decay

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dc.contributor.author	The NA48/2 Collaboration
dc.contributor.author	Batley, J. R.
dc.contributor.author	Fiorini, Luca
dc.date.accessioned	2020-06-10T08:30:39Z
dc.date.available	2020-06-10T08:30:39Z
dc.date.issued	2019
dc.identifier.uri	https://hdl.handle.net/10550/74969
dc.description.abstract	The NA48/2 experiment at CERN reports the first observation of the K±→π±π0e+e− decay from an exposure of 1.7×1011 charged kaon decays recorded in 2003-2004. A sample of 4919 candidates with 4.9% background contamination allows the determination of the branching ratio in the full kinematic region, BR(K±→π±π0e+e−)=(4.24±0.14)×10−6. The study of the kinematic space shows evidence for a structure dependent contribution in agreement with predictions based on chiral perturbation theory. Several P- and CP-violating asymmetries are also evaluated.
dc.language.iso	eng
dc.relation.ispartof	Physics Letters B, 2019, vol. 788, p. 552-561
dc.rights.uri	info:eu-repo/semantics/openAccess
dc.source	The NA48/2 Collaboration Batley, J. R. Fiorini, Luca 2019 First observation and study of the K± → π±π0e+e− decay Physics Letters B 788 552 561
dc.subject	Partícules (Física nuclear)
dc.subject	Violació CP (Física nuclear)
dc.title	First observation and study of the K± → π±π0e+e− decay
dc.type	info:eu-repo/semantics/article
dc.date.updated	2020-06-10T08:30:40Z
dc.identifier.doi	https://doi.org/10.1016/j.physletb.2018.11.046
dc.identifier.idgrec	139431