Searches for lepton number violating K+ → π−(π0)e+e+ decays

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

doi:10.1016/j.physletb.2022.137172

Searches for lepton number violating K+ → π−(π0)e+e+ decays

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

^*Corresponding author for this work

Physics and Astronomy

Research output: Contribution to journal › Article › peer-review

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Abstract

Searches for lepton number violating K+ → π−e+e+ and K+ → π−π0e+e+ decays have been performed using the complete dataset collected by the NA62 experiment at CERN in 2016–2018. Upper limits of 5.3 × 10−11 and 8.5 × 10−10 are obtained on the decay branching fractions at 90% confidence level. The former result improves by a factor of four over the previous best limit, while the latter result represents the first limit on the K+ → π−π0e+e+ decay rate.

Original language	English
Article number	137172
Number of pages	10
Journal	Physics Letters B
Volume	830
DOIs	https://doi.org/10.1016/j.physletb.2022.137172
Publication status	Published - 10 Jul 2022

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NA62 Collaboration, Bache, T., Brunetti, M. B., Duk, V., Goudzovski, E., Fascianelli, V., Fry, J., Gonnella, F., Henshaw, J., Iacobuzio, L., Lazzeroni, C., Lurkin, N., Newson, F., Parkinson, C., Romano, A., Sergi, A., Sturgess, A., Swallow, J., & Tomczak, A. (2022). Searches for lepton number violating K+ → π−(π0)e+e+ decays. Physics Letters B, 830, Article 137172. https://doi.org/10.1016/j.physletb.2022.137172

@article{4fc50146302942f498a1567dd83604e5,

title = "Searches for lepton number violating K+ → π−(π0)e+e+ decays",

abstract = "Searches for lepton number violating K+ → π−e+e+ and K+ → π−π0e+e+ decays have been performed using the complete dataset collected by the NA62 experiment at CERN in 2016–2018. Upper limits of 5.3 × 10−11 and 8.5 × 10−10 are obtained on the decay branching fractions at 90\% confidence level. The former result improves by a factor of four over the previous best limit, while the latter result represents the first limit on the K+ → π−π0e+e+ decay rate. ",

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

year = "2022",

month = jul,

day = "10",

doi = "10.1016/j.physletb.2022.137172",

language = "English",

volume = "830",

journal = "Physics Letters B",

issn = "0370-2693",

publisher = "Elsevier",

}

NA62 Collaboration, Bache, T, Brunetti, MB, Duk, V, Goudzovski, E, Fascianelli, V, Fry, J, Gonnella, F, Henshaw, J, Iacobuzio, L, Lazzeroni, C, Lurkin, N, Newson, F, Parkinson, C, Romano, A, Sergi, A, Sturgess, A, Swallow, J & Tomczak, A 2022, 'Searches for lepton number violating K+ → π−(π0)e+e+ decays', Physics Letters B, vol. 830, 137172. https://doi.org/10.1016/j.physletb.2022.137172

TY - JOUR

T1 - Searches for lepton number violating K+ → π−(π0)e+e+ decays

AU - NA62 Collaboration

AU - Bache, Thomas

AU - Brunetti, Maria Brigida

AU - Duk, Viacheslav

AU - Goudzovski, Evgueni

AU - Fascianelli, Valeria

AU - Fry, John

AU - Gonnella, Francesco

AU - Henshaw, Jack

AU - Iacobuzio, Lorenza

AU - Lazzeroni, Cristina

AU - Lurkin, Nicolas

AU - Newson, Francis

AU - Parkinson, Chris

AU - Romano, Angela

AU - Sergi, Antonino

AU - Sturgess, Andy

AU - Swallow, Joel

AU - Tomczak, Adam

PY - 2022/7/10

Y1 - 2022/7/10

N2 - Searches for lepton number violating K+ → π−e+e+ and K+ → π−π0e+e+ decays have been performed using the complete dataset collected by the NA62 experiment at CERN in 2016–2018. Upper limits of 5.3 × 10−11 and 8.5 × 10−10 are obtained on the decay branching fractions at 90% confidence level. The former result improves by a factor of four over the previous best limit, while the latter result represents the first limit on the K+ → π−π0e+e+ decay rate.

AB - Searches for lepton number violating K+ → π−e+e+ and K+ → π−π0e+e+ decays have been performed using the complete dataset collected by the NA62 experiment at CERN in 2016–2018. Upper limits of 5.3 × 10−11 and 8.5 × 10−10 are obtained on the decay branching fractions at 90% confidence level. The former result improves by a factor of four over the previous best limit, while the latter result represents the first limit on the K+ → π−π0e+e+ decay rate.

U2 - 10.1016/j.physletb.2022.137172

DO - 10.1016/j.physletb.2022.137172

M3 - Article

SN - 0370-2693

VL - 830

JO - Physics Letters B

JF - Physics Letters B

M1 - 137172

ER -

Searches for lepton number violating K+ → π−(π0)e+e+ decays

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Searches for lepton number violating K+ → π−(π0)e+e+ decays