Home > Research > Publications & Outputs > An investigation of the very rare K+ to π+ νν-...

Electronic data

  • 2007.08218

    Accepted author manuscript, 2.78 MB, PDF document

    Available under license: CC BY: Creative Commons Attribution 4.0 International License

Links

Text available via DOI:

View graph of relations

An investigation of the very rare K+ to π+ νν- decay

Research output: Contribution to Journal/MagazineJournal articlepeer-review

Published

Standard

An investigation of the very rare K+ to π+ νν- decay. / NA62 Collaboration ; Carmignani, Joe; Jones, Roger William Lewis; Ruggiero, Giuseppe; Dainton, John.

In: Journal of High Energy Physics, Vol. 2020, 42, 10.11.2020.

Research output: Contribution to Journal/MagazineJournal articlepeer-review

Harvard

APA

Vancouver

Author

Bibtex

@article{b7d565c45590481c95d7be4b3120dc4b,
title = "An investigation of the very rare K+ to π+ νν- decay",
abstract = "The NA62 experiment reports an investigation of the K+ to π+ νν- mode from a sample of K+ decays collected in 2017 at the CERN SPS. The experiment has achieved a single event sensitivity of (0.389 ± 0.024) × 10−10, corresponding to 2.2 events assuming the Standard Model branching ratio of (8.4 ± 1.0) × 10−11. Two signal candidates are observed with an expected background of 1.5 events. Combined with the result of a similar analysis conducted by NA62 on a smaller data set recorded in 2016, the collaboration now reports an upper limit of 1.78 × 10−10 for the K+ to π+ νν- branching ratio at 90% CL. This, together with the corresponding 68% CL measurement of (0.48+0.72−0.48) × 10−10, are currently the most precise results worldwide, and are able to constrain some New Physics models that predict large enhancements still allowed by previous measurements.",
author = "{NA62 Collaboration} and Joe Carmignani and Jones, {Roger William Lewis} and Giuseppe Ruggiero and John Dainton",
year = "2020",
month = nov,
day = "10",
doi = "10.1007/JHEP11(2020)042",
language = "English",
volume = "2020",
journal = "Journal of High Energy Physics",
issn = "1029-8479",
publisher = "Springer-Verlag",

}

RIS

TY - JOUR

T1 - An investigation of the very rare K+ to π+ νν- decay

AU - NA62 Collaboration

AU - Carmignani, Joe

AU - Jones, Roger William Lewis

AU - Ruggiero, Giuseppe

AU - Dainton, John

PY - 2020/11/10

Y1 - 2020/11/10

N2 - The NA62 experiment reports an investigation of the K+ to π+ νν- mode from a sample of K+ decays collected in 2017 at the CERN SPS. The experiment has achieved a single event sensitivity of (0.389 ± 0.024) × 10−10, corresponding to 2.2 events assuming the Standard Model branching ratio of (8.4 ± 1.0) × 10−11. Two signal candidates are observed with an expected background of 1.5 events. Combined with the result of a similar analysis conducted by NA62 on a smaller data set recorded in 2016, the collaboration now reports an upper limit of 1.78 × 10−10 for the K+ to π+ νν- branching ratio at 90% CL. This, together with the corresponding 68% CL measurement of (0.48+0.72−0.48) × 10−10, are currently the most precise results worldwide, and are able to constrain some New Physics models that predict large enhancements still allowed by previous measurements.

AB - The NA62 experiment reports an investigation of the K+ to π+ νν- mode from a sample of K+ decays collected in 2017 at the CERN SPS. The experiment has achieved a single event sensitivity of (0.389 ± 0.024) × 10−10, corresponding to 2.2 events assuming the Standard Model branching ratio of (8.4 ± 1.0) × 10−11. Two signal candidates are observed with an expected background of 1.5 events. Combined with the result of a similar analysis conducted by NA62 on a smaller data set recorded in 2016, the collaboration now reports an upper limit of 1.78 × 10−10 for the K+ to π+ νν- branching ratio at 90% CL. This, together with the corresponding 68% CL measurement of (0.48+0.72−0.48) × 10−10, are currently the most precise results worldwide, and are able to constrain some New Physics models that predict large enhancements still allowed by previous measurements.

U2 - 10.1007/JHEP11(2020)042

DO - 10.1007/JHEP11(2020)042

M3 - Journal article

VL - 2020

JO - Journal of High Energy Physics

JF - Journal of High Energy Physics

SN - 1029-8479

M1 - 42

ER -