The K+ -> pi+ nu nubar decay is a golden mode for search of New Physics in the flavour sector. The Standard Model prediction of its branching ratio is less than 10^-10. The NA62 experiment at the CERN SPS is designed to study the K+ -> pi+ nu nubar decay, and provides the world's most precise investigation of this decay. NA62 is a multi-purpose high-intensity kaon decay experiment, and also carries out a broad rare-decay and hidden-sector physics programme with dedicated trigger lines.

10.22323/1.476.0445

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

arXiv (Cornell University) (2024)

E. Cortina J. Jerhot N. Lurkin D. Bryman Toshio Numao

A measurement of the $K^{+}\rightarrow\pi^{+}\nu\bar{\nu}$ 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 $B(K^{+}\rightarrow\pi^{+}\nu\bar{\nu}) = \left( 13.0^{+ 3.3}_{- 3.0} \right)\times10^{-11}$ is reported. With $51$ signal candidates observed and an expected background of $18^{+3}_{-2}$ events, $B(K^{+}\rightarrow\pi^{+}\nu\bar{\nu})$ becomes the smallest branching ratio measured with a signal significance above $5\,\sigma$.

Bar (unit)

Branching fraction

Branching (polymer chemistry)

Sigma

10.48550/arxiv.2412.12015

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A high sensitivity investigation of $K_{\rm S}$ and neutral hyperon decays using a modified $K_{\rm S}$ beam

E. Iacopini K. Eppard N. Pastrone H. Dibon A. Nappi

Source

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Physics Briefing Book

HAL (Le Centre pour la Communication Scientifique Directe) (2019)

R. Keith Ellis B. Heinemann Jorge de Blas M. Cepeda Christophe Grojean

Source

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Physics Briefing Book

R. Keith Ellis B. Heinemann Jorge de Blas M. Cepeda Christophe Grojean

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Physics Briefing Book

R. Keith Ellis B. Heinemann Jorge de Blas M. Cepeda Christophe Grojean

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A glass spherical Cherenkov counter based on total internal reflection

Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment (1990)

C. Biino A. Ceccucci R. Cester F. Marchetto E. Menichetti

Reflection

Particle identification

Cherenkov detector

10.1016/0168-9002(90)90428-9

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Review of Particle Physics

Physics Letters B (2008)

C. Amsler M. Doser M. Antonelli D.M. Asner K.S. Babu

Cabibbo–Kobayashi–Maskawa matrix

10.1016/j.physletb.2008.07.018

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Citations (4,917)

Charmonium spectroscopy in p̄p annihilations

AIP conference proceedings (1992)

T. A. Armstrong D. Bettoni V. Bharadwaj C. Biino G. Borreani

This paper presents the experimental status of charmonium spectroscopy and describes the technique of c̄c formation in p̄p annihilations used by the experiment E760 at Fermilab. Results from 1990 data taking are reported.

Fermilab

Gamma Spectroscopy

10.1063/1.41627

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