First observation and study of the K ± → π ± π 0 e + e − decay

, The NA48/2 Collaboration (2019) First observation and study of the K ±  → π ± π 0 e + e − decay. Physics Letters B, 788. pp. 552-561. ISSN 0370-2693

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Abstract

The NA48/2 experiment at CERN reports the first observation of the K ± →π ± π 0 e + e − decay from an exposure of 1.7×10 11 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 ± π 0 e + 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.

Item Type:
Journal Article
Journal or Publication Title:
Physics Letters B
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/3100/3106
Subjects:
ID Code:
132199
Deposited By:
Deposited On:
29 Mar 2019 09:00
Refereed?:
Yes
Published?:
Published
Last Modified:
16 Jun 2021 06:24