Search for lepton number and flavour violation in K+ and π0 decays

NA62 Collaboration

Search for lepton number and flavour violation in K⁺ and π⁰ decays

NA62 Collaboration

Comenius University

Research output: Contribution to journal › Conference article › peer-review

Abstract

The NA62 experiment at CERN collected a large sample of charged kaon decays into final states with multiple charged particles in 2016-2018. This sample provides sensitivities to rare decays with branching ratios as low as 10⁻¹¹. Searches for the lepton number violating K⁺ → π⁻µ⁺e⁺ decay and the lepton flavour violating K⁺ → π⁺µ⁻e⁺ and π⁰ → µ⁻e⁺ decays are reported. No evidence for these decays is found and upper limits of the branching ratios are obtained at 90% confidence level. These results improve by one order of magnitude over previous results for these decay modes.

Original language	English
Article number	426
Journal	Proceedings of Science
Volume	380
Publication status	Published - 24 May 2022
Event	22nd Particles and Nuclei International Conference, PANIC 2021 - Virtual, Online, Portugal Duration: 5 Sept 2021 → 10 Sept 2021

Cite this

@article{6777a210d5124d44aeb00394e060903e,

title = "Search for lepton number and flavour violation in K+ and π0 decays",

abstract = "The NA62 experiment at CERN collected a large sample of charged kaon decays into final states with multiple charged particles in 2016-2018. This sample provides sensitivities to rare decays with branching ratios as low as 10−11. Searches for the lepton number violating K+ → π−µ+e+ decay and the lepton flavour violating K+ → π+µ−e+ and π0 → µ−e+ decays are reported. No evidence for these decays is found and upper limits of the branching ratios are obtained at 90\% confidence level. These results improve by one order of magnitude over previous results for these decay modes.",

author = "\{NA62 Collaboration\} and Roberta Volpe and A. Akmete and R. Aliberti and F. Ambrosino and R. Ammendola and B. Angelucci and A. Antonelli and G. Anzivino and R. Arcidiacono and T. Bache and A. Baeva and D. Baigarashev and L. Bandiera and M. Barbanera and J. Bern-Hard and A. Biagioni and L. Bician and C. Biino and A. Bizzeti and T. Blazek and B. Bloch-Devaux and P. Boboc and V. Bonaiuto and M. Boretto and M. Bragadireanu and A. BrianoOlvera and D. Britton and F. Brizioli and Brunetti, \{M. B.\} and D. Bryman and F. Bucci and T. Capussela and J. Carmignani and A. Ceccucci and P. Cenci and V. Cerny and C. Cerri and B. Checcucci and A. Conovaloff and P. Cooper and Gil, \{E. Cortina\} and M. Corvino and F. Costantini and Ramusino, \{A. Cotta\} and D. Coward and G. D'Agostini and J. Dainton and P. Dalpiaz and H. Danielsson and E. Maurice",

note = "Publisher Copyright: {\textcopyright} Copyright owned by the author(s) under the terms of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License (CC BY-NC-ND 4.0); 22nd Particles and Nuclei International Conference, PANIC 2021 ; Conference date: 05-09-2021 Through 10-09-2021",

year = "2022",

month = may,

day = "24",

language = "English",

volume = "380",

journal = "Proceedings of Science",

issn = "1824-8039",

publisher = "Sissa Medialab Srl",

}

TY - JOUR

T1 - Search for lepton number and flavour violation in K+ and π0 decays

AU - NA62 Collaboration

AU - Volpe, Roberta

AU - Akmete, A.

AU - Aliberti, R.

AU - Ambrosino, F.

AU - Ammendola, R.

AU - Angelucci, B.

AU - Antonelli, A.

AU - Anzivino, G.

AU - Arcidiacono, R.

AU - Bache, T.

AU - Baeva, A.

AU - Baigarashev, D.

AU - Bandiera, L.

AU - Barbanera, M.

AU - Bern-Hard, J.

AU - Biagioni, A.

AU - Bician, L.

AU - Biino, C.

AU - Bizzeti, A.

AU - Blazek, T.

AU - Bloch-Devaux, B.

AU - Boboc, P.

AU - Bonaiuto, V.

AU - Boretto, M.

AU - Bragadireanu, M.

AU - BrianoOlvera, A.

AU - Britton, D.

AU - Brizioli, F.

AU - Brunetti, M. B.

AU - Bryman, D.

AU - Bucci, F.

AU - Capussela, T.

AU - Carmignani, J.

AU - Ceccucci, A.

AU - Cenci, P.

AU - Cerny, V.

AU - Cerri, C.

AU - Checcucci, B.

AU - Conovaloff, A.

AU - Cooper, P.

AU - Gil, E. Cortina

AU - Corvino, M.

AU - Costantini, F.

AU - Ramusino, A. Cotta

AU - Coward, D.

AU - D'Agostini, G.

AU - Dainton, J.

AU - Dalpiaz, P.

AU - Danielsson, H.

AU - Maurice, E.

N1 - Publisher Copyright: © Copyright owned by the author(s) under the terms of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License (CC BY-NC-ND 4.0)

PY - 2022/5/24

Y1 - 2022/5/24

N2 - The NA62 experiment at CERN collected a large sample of charged kaon decays into final states with multiple charged particles in 2016-2018. This sample provides sensitivities to rare decays with branching ratios as low as 10−11. Searches for the lepton number violating K+ → π−µ+e+ decay and the lepton flavour violating K+ → π+µ−e+ and π0 → µ−e+ decays are reported. No evidence for these decays is found and upper limits of the branching ratios are obtained at 90% confidence level. These results improve by one order of magnitude over previous results for these decay modes.

AB - The NA62 experiment at CERN collected a large sample of charged kaon decays into final states with multiple charged particles in 2016-2018. This sample provides sensitivities to rare decays with branching ratios as low as 10−11. Searches for the lepton number violating K+ → π−µ+e+ decay and the lepton flavour violating K+ → π+µ−e+ and π0 → µ−e+ decays are reported. No evidence for these decays is found and upper limits of the branching ratios are obtained at 90% confidence level. These results improve by one order of magnitude over previous results for these decay modes.

M3 - Conference article

AN - SCOPUS:85131675284

SN - 1824-8039

VL - 380

JO - Proceedings of Science

JF - Proceedings of Science

M1 - 426

T2 - 22nd Particles and Nuclei International Conference, PANIC 2021

Y2 - 5 September 2021 through 10 September 2021

ER -

Search for lepton number and flavour violation in K+ and π0 decays

Abstract

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Search for lepton number and flavour violation in K⁺ and π⁰ decays