Observation of the $ {K}^{+}\to {\pi}^{+}\nu \overline{\nu} $ decay and measurement of its branching ratio - INSPIRE

DataBETA

Observation of the ${K}^{+}\to {\pi}^{+}\nu \overline{\nu}$ decay and measurement of its branching ratio

NA62

Collaboration

Dec 16, 2024

29 pages

Published in:

JHEP 02 (2025) 191,
JHEP 02 (2025) 191

Published: Feb 27, 2025
and
Published: Feb, 2025

e-Print:

2412.12015 [hep-ex]

DOI:

10.1007/JHEP02(2025)191

Report number:

CERN-EP-2024-343

Experiments:

CERN-NA-062,
CERN-NA-062

View in:

reference search8 citations

Citations per year

Abstract: (Springer)

A measurement of the

{K}^{+}\to {\pi}^{+}\nu \overline{\nu}

decay by the NA62 experiment at the CERN SPS is presented, using data collected in 2021 and 2022. This dataset was recorded, after modifications to the beamline and detectors, at a higher instantaneous beam intensity with respect to the 2016–2018 data taking. Combining NA62 data collected in 2016–2022, a measurement of

\mathcal{B}\left({K}^{+}\to {\pi}^{+}\nu \overline{\nu}\right)=\left({13.0}_{-3.0}^{+3.3}\right)\times {10}^{-11}

is reported. With 51 signal candidates observed and an expected background of

{18}_{-2}^{+3}

events,

\mathcal{B}\left({K}^{+}\to {\pi}^{+}\nu \overline{\nu}\right)

becomes the smallest branching ratio measured with a signal significance above 5σ.

Note:

To be submitted to JHEP

Branching fraction
Rare Decay
Flavour Physics
Other Experiments

References(31)

Figures(24)

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