Measurement of the very rare K+ → π+ν(Equation presented) decay at the NA62 experiment at CERN

The NA62 Collaboration

doi:10.22323/1.402.0176

Measurement of the very rare K⁺ → π⁺ν(Equation presented) decay at the NA62 experiment at CERN

The NA62 Collaboration

School of Physics

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

Abstract

The NA62 experiment reports the branching ratio measurement BR(K⁺ → π⁺ν(Equation presented)) at 68 % CL, based on the observation of 20 signal candidates with an expected background of 7.0 events from the total data sample collected at the CERN SPS during 2016-2018. This provides evidence for the very rare K⁺ → π⁺ν(Equation presented) decay, observed with a significance of 3.4σ. The experiment achieves a single event sensitivity of (0.839 ± 0.054) × 10⁻¹¹, corresponding to 10.0 events assuming the Standard Model branching ratio of (8.4 ± 1.0) × 10⁻¹¹. The result represents the most accurate measurement achieved so far of this ultra-rare decay. Future prospects and plans for data taking from 2021 will also be presented.

Original language	English
Title of host publication	Proceedings of Science
Volume	402
DOIs	https://doi.org/10.22323/1.402.0176
Publication status	Published - 31 Mar 2022
Event	22nd International Workshop on Neutrinos from Accelerators, NuFact 2021 - Cagliari, Italy Duration: 6 Sept 2021 → 11 Sept 2021

Publication series

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

Conference

Conference	22nd International Workshop on Neutrinos from Accelerators, NuFact 2021
Country/Territory	Italy
City	Cagliari
Period	6/09/21 → 11/09/21

Bibliographical note

Publisher Copyright:
© Copyright owned by the author(s) under the terms of the Creative Commons

Access to Document

10.22323/1.402.0176Licence: CC BY-NC-ND

Handle.net

Persistent link

Cite this

@inproceedings{cebee361e51f40f88f4dcd81a1a94cd3,

title = "Measurement of the very rare K+ → π+ν(Equation presented) decay at the NA62 experiment at CERN",

abstract = "The NA62 experiment reports the branching ratio measurement BR(K+ → π+ν(Equation presented)) at 68 \% CL, based on the observation of 20 signal candidates with an expected background of 7.0 events from the total data sample collected at the CERN SPS during 2016-2018. This provides evidence for the very rare K+ → π+ν(Equation presented) decay, observed with a significance of 3.4σ. The experiment achieves a single event sensitivity of (0.839 ± 0.054) × 10−11, corresponding to 10.0 events assuming the Standard Model branching ratio of (8.4 ± 1.0) × 10−11. The result represents the most accurate measurement achieved so far of this ultra-rare decay. Future prospects and plans for data taking from 2021 will also be presented.",

author = "\{The NA62 Collaboration\} and Renato Fiorenza 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. Bernhard 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 \{Briano Olvera\}, A. and D. Britton 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; 22nd International Workshop on Neutrinos from Accelerators, NuFact 2021 ; Conference date: 06-09-2021 Through 11-09-2021",

year = "2022",

month = mar,

day = "31",

doi = "10.22323/1.402.0176",

language = "English",

volume = "402",

series = "Proceedings of Science",

publisher = "SISSA",

booktitle = "Proceedings of Science",

}

TY - GEN

T1 - Measurement of the very rare K+ → π+ν(Equation presented) decay at the NA62 experiment at CERN

AU - The NA62 Collaboration

AU - Fiorenza, Renato

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 - Bernhard, 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 - Briano Olvera, A.

AU - Britton, D.

AU - Heath, H.

AU - Page, R.

AU - Trilov, S.

PY - 2022/3/31

Y1 - 2022/3/31

N2 - The NA62 experiment reports the branching ratio measurement BR(K+ → π+ν(Equation presented)) at 68 % CL, based on the observation of 20 signal candidates with an expected background of 7.0 events from the total data sample collected at the CERN SPS during 2016-2018. This provides evidence for the very rare K+ → π+ν(Equation presented) decay, observed with a significance of 3.4σ. The experiment achieves a single event sensitivity of (0.839 ± 0.054) × 10−11, corresponding to 10.0 events assuming the Standard Model branching ratio of (8.4 ± 1.0) × 10−11. The result represents the most accurate measurement achieved so far of this ultra-rare decay. Future prospects and plans for data taking from 2021 will also be presented.

AB - The NA62 experiment reports the branching ratio measurement BR(K+ → π+ν(Equation presented)) at 68 % CL, based on the observation of 20 signal candidates with an expected background of 7.0 events from the total data sample collected at the CERN SPS during 2016-2018. This provides evidence for the very rare K+ → π+ν(Equation presented) decay, observed with a significance of 3.4σ. The experiment achieves a single event sensitivity of (0.839 ± 0.054) × 10−11, corresponding to 10.0 events assuming the Standard Model branching ratio of (8.4 ± 1.0) × 10−11. The result represents the most accurate measurement achieved so far of this ultra-rare decay. Future prospects and plans for data taking from 2021 will also be presented.

UR - https://www.scopus.com/pages/publications/85128882590

U2 - 10.22323/1.402.0176

DO - 10.22323/1.402.0176

M3 - Conference Contribution (Conference Proceeding)

AN - SCOPUS:85128882590

VL - 402

T3 - Proceedings of Science

BT - Proceedings of Science

T2 - 22nd International Workshop on Neutrinos from Accelerators, NuFact 2021

Y2 - 6 September 2021 through 11 September 2021

ER -