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

J. R. Batley; Evgueni Goudzovski; NA48/2 collaboration

doi:10.1016/j.physletb.2018.11.046

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

J. R. Batley, Evgueni Goudzovski, NA48/2 collaboration

Physics and Astronomy

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Abstract

The NA48/2 experiment at CERN reports the first observation of the K ^±→π ^±π ⁰e ⁺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 ⁰e ⁺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.

Original language	English
Pages (from-to)	552-561
Number of pages	10
Journal	Physics Letters B
Volume	788
Early online date	29 Nov 2018
DOIs	https://doi.org/10.1016/j.physletb.2018.11.046
Publication status	Published - 10 Jan 2019

ASJC Scopus subject areas

Nuclear and High Energy Physics

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title = "First observation and study of the K± → π±π0e+e− decay",

abstract = "The NA48/2 experiment at CERN reports the first observation of the K ±→π ±π 0e +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 0e +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. ",

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AU - Batley, J. R.

AU - Goudzovski, Evgueni

AU - NA48/2 collaboration

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Y1 - 2019/1/10

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AB - The NA48/2 experiment at CERN reports the first observation of the K ±→π ±π 0e +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 0e +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.

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SP - 552

EP - 561

JO - Physics Letters B

JF - Physics Letters B

ER -

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

Abstract

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