A study of the K+ → π0e+νγ decay

NA62 Collaboration; Thomas Bache; Maria Brigida Brunetti; Viacheslav Duk; Valeria Fascianelli; John Fry; Francesco Gonnella; Evgueni Goudzovski; Jack Henshaw; Lorenza Iacobuzio; Chandler Kenworthy; Cristina Lazzeroni; Nicolas Lurkin; Francis Newson; Chris Parkinson; Angela Romano; Jack Sanders; Antonino Sergi; Andy Sturgess; Joel Swallow; Adam Tomczak

doi:10.1007/JHEP09(2023)040

A study of the K+ → π⁰e⁺νγ decay

NA62 Collaboration, Thomas Bache, Maria Brigida Brunetti, Viacheslav Duk, Valeria Fascianelli, John Fry, Francesco Gonnella, Evgueni Goudzovski, Jack Henshaw, Lorenza Iacobuzio, Chandler Kenworthy, Cristina Lazzeroni, Nicolas Lurkin, Francis Newson, Chris Parkinson, Angela Romano, Jack Sanders, Antonino Sergi, Andy Sturgess, Joel SwallowAdam Tomczak

Physics and Astronomy

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Abstract

A sample of 1.3 × 10⁵ K+ → π⁰e⁺νγ candidates with less than 1% background was collected by the NA62 experiment at the CERN SPS in 2017–2018. Branching fraction measurements are obtained at percent relative precision in three restricted kinematic regions, improving on existing results by a factor larger than two. An asymmetry, possibly related to T-violation, is investigated with no evidence observed within the achieved precision.

Original language	English
Article number	40
Number of pages	17
Journal	Journal of High Energy Physics
Volume	2023
DOIs	https://doi.org/10.1007/JHEP09(2023)040
Publication status	Published - 7 Sept 2023

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NA62 Collaboration, Bache, T., Brunetti, M. B., Duk, V., Fascianelli, V., Fry, J., Gonnella, F., Goudzovski, E., Henshaw, J., Iacobuzio, L., Kenworthy, C., Lazzeroni, C., Lurkin, N., Newson, F., Parkinson, C., Romano, A., Sanders, J., Sergi, A., Sturgess, A., ... Tomczak, A. (2023). A study of the K+ → π⁰e⁺νγ decay. Journal of High Energy Physics, 2023, Article 40. https://doi.org/10.1007/JHEP09(2023)040

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title = "A study of the K+ → π0e+νγ decay",

abstract = "A sample of 1.3 × 105 K+ → π0e+νγ candidates with less than 1% background was collected by the NA62 experiment at the CERN SPS in 2017–2018. Branching fraction measurements are obtained at percent relative precision in three restricted kinematic regions, improving on existing results by a factor larger than two. An asymmetry, possibly related to T-violation, is investigated with no evidence observed within the achieved precision.",

author = "{NA62 Collaboration} and Thomas Bache and Brunetti, {Maria Brigida} and Viacheslav Duk and Valeria Fascianelli and John Fry and Francesco Gonnella and Evgueni Goudzovski and Jack Henshaw and Lorenza Iacobuzio and Chandler Kenworthy and Cristina Lazzeroni and Nicolas Lurkin and Francis Newson and Chris Parkinson and Angela Romano and Jack Sanders and Antonino Sergi and Andy Sturgess and Joel Swallow and Adam Tomczak",

year = "2023",

month = sep,

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doi = "10.1007/JHEP09(2023)040",

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NA62 Collaboration, Bache, T, Brunetti, MB, Duk, V, Fascianelli, V, Fry, J, Gonnella, F, Goudzovski, E, Henshaw, J, Iacobuzio, L, Kenworthy, C, Lazzeroni, C, Lurkin, N, Newson, F, Parkinson, C, Romano, A, Sanders, J, Sergi, A, Sturgess, A, Swallow, J & Tomczak, A 2023, 'A study of the K+ → π⁰e⁺νγ decay', Journal of High Energy Physics, vol. 2023, 40. https://doi.org/10.1007/JHEP09(2023)040

TY - JOUR

T1 - A study of the K+ → π0e+νγ decay

AU - NA62 Collaboration

AU - Bache, Thomas

AU - Brunetti, Maria Brigida

AU - Duk, Viacheslav

AU - Fascianelli, Valeria

AU - Fry, John

AU - Gonnella, Francesco

AU - Goudzovski, Evgueni

AU - Henshaw, Jack

AU - Iacobuzio, Lorenza

AU - Kenworthy, Chandler

AU - Lazzeroni, Cristina

AU - Lurkin, Nicolas

AU - Newson, Francis

AU - Parkinson, Chris

AU - Romano, Angela

AU - Sanders, Jack

AU - Sergi, Antonino

AU - Sturgess, Andy

AU - Swallow, Joel

AU - Tomczak, Adam

PY - 2023/9/7

Y1 - 2023/9/7

N2 - A sample of 1.3 × 105 K+ → π0e+νγ candidates with less than 1% background was collected by the NA62 experiment at the CERN SPS in 2017–2018. Branching fraction measurements are obtained at percent relative precision in three restricted kinematic regions, improving on existing results by a factor larger than two. An asymmetry, possibly related to T-violation, is investigated with no evidence observed within the achieved precision.

AB - A sample of 1.3 × 105 K+ → π0e+νγ candidates with less than 1% background was collected by the NA62 experiment at the CERN SPS in 2017–2018. Branching fraction measurements are obtained at percent relative precision in three restricted kinematic regions, improving on existing results by a factor larger than two. An asymmetry, possibly related to T-violation, is investigated with no evidence observed within the achieved precision.

U2 - 10.1007/JHEP09(2023)040

DO - 10.1007/JHEP09(2023)040

M3 - Article

SN - 1126-6708

VL - 2023

JO - Journal of High Energy Physics

JF - Journal of High Energy Physics

M1 - 40

ER -

A study of the K+ → π0e+νγ decay

Abstract

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A study of the K+ → π⁰e⁺νγ decay