Searches for lepton flavour and lepton number violation in K+ decays at NA62

NA62 Collaboration

Searches for lepton flavour and lepton number violation in K⁺ decays at NA62

NA62 Collaboration

School of Physics

Research output: Chapter in Book/Report/Conference proceeding › Conference Contribution (Conference Proceeding)

Abstract

A search for the lepton number violating K⁺ ? p^-µ^+e+ and lepton flavour violating K⁺ ? p^-µ^-e+ decays is reported using NA62 data collected in 2017 and 2018. No significant excess is observed above the background expectation and therefore upper limits are established on the branching ratios at 90% confidence level: B(K⁺ ? p^-µ^+e+) < 4.2 × 10^-11 and B(K⁺ ? p⁺µ^-e+) < 6.6 × 10^-11. These results improve over the previous limits by factors of 12 and 8 respectively.

Original language	English
Title of host publication	Proceedings of Science
Volume	390
Publication status	Published - 15 Apr 2021
Event	40th International Conference on High Energy Physics, ICHEP 2020 - Virtual, Prague, Czech Republic Duration: 28 Jul 2020 → 6 Aug 2020

Publication series

Name	Proceedings of Science
Publisher	SISSA
ISSN (Print)	1824-8039

Conference

Conference	40th International Conference on High Energy Physics, ICHEP 2020
Country	Czech Republic
City	Virtual, Prague
Period	28/07/20 → 6/08/20

Bibliographical note

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).

Cite this

@inproceedings{b1978b0f8cbe4027ab4d1f01405c7b3d,

title = "Searches for lepton flavour and lepton number violation in K+ decays at NA62",

abstract = "A search for the lepton number violating K+ ? p-µ+e+ and lepton flavour violating K+ ? p-µ-e+ decays is reported using NA62 data collected in 2017 and 2018. No significant excess is observed above the background expectation and therefore upper limits are established on the branching ratios at 90% confidence level: B(K+ ? p-µ+e+) < 4.2 × 10-11 and B(K+ ? p+µ-e+) < 6.6 × 10-11. These results improve over the previous limits by factors of 12 and 8 respectively.",

author = "{NA62 Collaboration} and Joel Swallow 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 M. Barbanera and J. Bernhard and A. Biagioni and L. Bician and C. Biino and A. Bizzeti and T. Blazek and B. Bloch-Devaux and V. Bonaiuto and M. Boretto and M. Bragadireanu 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 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 {de Simone}, N. and {Di Filippo}, D. and {Di Lella}, L. and H. Heath and R. Page and S. Trilov",

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).; 40th International Conference on High Energy Physics, ICHEP 2020 ; Conference date: 28-07-2020 Through 06-08-2020",

year = "2021",

month = apr,

day = "15",

language = "English",

volume = "390",

series = "Proceedings of Science",

publisher = "SISSA",

booktitle = "Proceedings of Science",

}

TY - GEN

T1 - Searches for lepton flavour and lepton number violation in K+ decays at NA62

AU - NA62 Collaboration

AU - Swallow, Joel

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 - Barbanera, M.

AU - Bernhard, J.

AU - Biagioni, A.

AU - Bician, L.

AU - Biino, C.

AU - Bizzeti, A.

AU - Blazek, T.

AU - Bloch-Devaux, B.

AU - Bonaiuto, V.

AU - Boretto, M.

AU - Bragadireanu, M.

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 - 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 - de Simone, N.

AU - Di Filippo, D.

AU - Di Lella, L.

AU - Heath, H.

AU - Page, R.

AU - Trilov, S.

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 - 2021/4/15

Y1 - 2021/4/15

N2 - A search for the lepton number violating K+ ? p-µ+e+ and lepton flavour violating K+ ? p-µ-e+ decays is reported using NA62 data collected in 2017 and 2018. No significant excess is observed above the background expectation and therefore upper limits are established on the branching ratios at 90% confidence level: B(K+ ? p-µ+e+) < 4.2 × 10-11 and B(K+ ? p+µ-e+) < 6.6 × 10-11. These results improve over the previous limits by factors of 12 and 8 respectively.

AB - A search for the lepton number violating K+ ? p-µ+e+ and lepton flavour violating K+ ? p-µ-e+ decays is reported using NA62 data collected in 2017 and 2018. No significant excess is observed above the background expectation and therefore upper limits are established on the branching ratios at 90% confidence level: B(K+ ? p-µ+e+) < 4.2 × 10-11 and B(K+ ? p+µ-e+) < 6.6 × 10-11. These results improve over the previous limits by factors of 12 and 8 respectively.

UR - http://www.scopus.com/inward/record.url?scp=85105476444&partnerID=8YFLogxK

M3 - Conference Contribution (Conference Proceeding)

AN - SCOPUS:85105476444

VL - 390

T3 - Proceedings of Science

BT - Proceedings of Science

T2 - 40th International Conference on High Energy Physics, ICHEP 2020

Y2 - 28 July 2020 through 6 August 2020

ER -