First search for $K^{+}\to {\pi }^{+}\nu \bar{\nu }$ using the decay-in-flight technique

Abstract

The NA62 experiment at the CERN SPS reports the first search for $K^{+}\to {\pi }^{+}\nu \bar{\nu }$ using the decay-in-flight technique, based on a sample of $1.21\times 10^{11}$ $K^{+}$ decays collected in 2016. The single event sensitivity is $3.15\times 10^{-10}$, corresponding to 0.267 Standard Model events. One signal candidate is observed while the expected background is 0.152 events. This leads to an upper limit of $14\times 10^{-10}$ on the $K^{+}\to {\pi }^{+}\nu \bar{\nu }$ branching ratio at 95\% CL.

18 pages, 13 figures

References in corpus (8)

• Study of the decay K+ => pi+,nu,nubar in the momentum region 140<Ppi<199 MeV/c
• Two-Loop Electroweak Corrections for the K -> pi nu anti-nu Decays
• The Beam and detector of the NA62 experiment at CERN
• Evaluation of three methods for calculating statistical significance when incorporating a systematic uncertainty into a test of the background-only hypothesis for a Poisson process
• Quark flavour observables in the Littlest Higgs model with T-parity after LHC Run 1
• Probing Lepton Flavour Universality with $K\to \pi \nu \bar{\nu }$ decays
• Precise Mirror Alignment and Basic Performance of the RICH Detector of the NA62 Experiment at CERN
• Level Zero Trigger Processor for the NA62 experiment

Cited by in corpus (29)

• The Dark Photon
• Feebly-Interacting Particles:FIPs 2020 Workshop Report
• The Search for Feebly-Interacting Particles
• Probing Muonic Forces and Dark Matter at Kaon Factories
• Direct detection and complementary constraints for sub-GeV dark matter
• Explaining $(g-2{)}_{\mu ,e}$, the KOTO anomaly and the MiniBooNE excess in an extended Higgs model with sterile neutrinos
• Search for heavy neutral lepton production in $K^{+}$ decays to positrons
• Probing dark sectors with long-lived particles at BELLE II
• New physics implications of recent search for $K_L\to {\pi }^0\nu \bar{\nu }$ at KOTO
• Lattice QCD study of the rare kaon decay $K^{+}\to {\pi }^{+}\nu \bar{\nu }$ at a near-physical pion mass
• New physics in $b\to s\ell \ell$ transitions at one loop
• Opportunities for lattice QCD in quark and lepton flavor physics
• The NA62 GigaTracKer: a low mass high intensity beam 4D tracker with 65 ps time resolution on tracks
• Pair production of dark particles in meson decays
• Dark Matter-Neutrino Interconversion at COHERENT, Direct Detection, and the Early Universe
• Exploring leptoquark effects in hyperon and kaon decays with missing energy
• Flavor-changing hyperon decays with light invisible bosons
• KLEVER: An experiment to measure BR($K_L\to {\pi }^0\nu \bar{\nu }$) at the CERN SPS
• Probing new physics with the kaon decays $K\to \pi \pi /E$
• Search for a massless particle beyond the Standard Model in the ${\Sigma }^{+}\to p+\mathrm{invisible}$ decay
• Study of $s\to d\nu \bar{\nu }$ rare hyperon decays within the Standard Model and new physics
• Light Detection System and Time Resolution of the NA62 RICH
• Perspectives and Outlook from HEP Window on the Universe
• Dark Matter as a Solution to Muonic Puzzles
• Cosmological implications of the KOTO excess
• Possible manifestation of the 2p pionium in particle physics processes
• Dark Matter emission at Belle II and NA62 in Minimal Flavor Violation framework
• Physics beyond SM with kaons from NA62
• Pionium as a source of false events in the $K\to \pi \nu \bar{\nu }$ decays