127 research outputs found
K+ → π+νν ̄ at NA62
No full textThe status of the experiment NA62 is reviewed. With its construction and commissioning completed, the experiment is now ready to tackle the measurement of K+ → π+νν ̄
Searches for rare and forbidden kaon decays at the NA62 experiment at CERN
No full textThe NA62 experiment at the CERN SPS aims at measuring the branching ratio (BR) of the rare K+ → π+vv̄ decay, with a precision of ∼ 10%. This goal will be achieved after two years of data taking by collecting ∼ 1013 K+ decays in the fiducial volume. The K+ → π+vv̄ is a "golden mode" in flavor physics because of the precise theoretical prediction. Thanks to the unprecedent kaon flux, it will also be possible to search for many other forbidden processes, including leptor flavor violation modes, sterile neutrinos, supersymmetric particles. The expected NA62 performances will wallow the exclusion limits for several decay modes to be improved. The experiment will start collecting data in late 2014. © Copyright owned by the author(s) under the terms of the Creative Commons Attribution-NonCommercial-ShareAlike Licence
Lepton flavour universality and lepton flavour conservation tests in kaon decays at CERN
No full textA precision measurement of the ratio of the rates of kaon leptonic decays K± â e± v and K± â μ±v with the full minimum bias data sample collected with low intensity 75 GeV/c beam by the NA62 experiment at CERN in 2007-2008 is reported. The result, obtained by analyzing 150,000 reconstructed K ± â e± v candidates with 11% background contamination, has a record precision of 0.4% and is in agreement with the Standard Model expectation. An improved upper limit on the rate of the lepton number violating decay K± â Ï Â±Î¼ ±μ± from the NA48/2 experiment, which probes the resonant enhancement of the rate in the presence of heavy Majorana neutrinos in the 100 MeV range, is also reported. The prospects for the searches of lepton number and flavour violating decays of the charged kaon with an improved sensitivity down to 10-12 during the forthcoming main phase of the NA62 experiment are discussed. © Copyright owned by the author(s)
LFV and exotics at the NA62 experiment
No full textThe NA62 experiment at the CERN SPS is aimed at measuring the branching fraction of the ultrarare decay K+ → π+v with ∼10% precision by collecting ∼1013 kaon decays in two years of data taking. This amount of data will allow to carry out a wide program of searching for rare and forbidden (within the Standard Model) K+ and π0 decays, including sterile neutrinos, lepton flavor violating modes, exotic particles (e.g. "dark photons"). The expected performances of the NA62 setup will allow to improve existing limits for several decay modes
Prospects for K+→ π+vv observation at CERN in NA62
No full texthe rare decay K+→ π+vv is an excellent process to make tests of new physics at the highest scale complementary to LHC thanks to its theoretical cleanness. The NA62 experiment at CERN SPS aims to collect of the order of 100 events in two years of data taking, keeping the background at the level of 10%. Part of the experimental apparatus has been commissioned during a technical run in 2012. The physics prospects and the status of the experiment are reviewed in light of the pilot run which occurred in October-December 2014
The NA62 Experiment: Prospects for K+ -> pi+ nu nubar Measurement
No full textThe general principles of the NA62 experiment for measuring the K+ ! p+n ̄ n branching ratio are reviewed. The goal of the experiment is to collect about 100 events of K+ ! p+n ̄ n in two
years of data with less than 20% background. An analysis of the performances based on detailed
simulations and data from various test beams shows that the sensitivity of the experiment matches the requirements. The results from the NA62 technical run of November 2012 are also reported
Precision tests of the Standard Model with kaon decays at CERN
No full textRecent results and prospects for precision tests of the Standard Model in kaon decay in flight experiments at CERN are presented. A measurement of the ratio of leptonic decay rates of the charged kaon at a 0.4% precision constrains the parameter space of new physics models with, for example, an extended Higgs sector. Searches for neutrino mass states and the dark photon in the 100 MeV = c 2 mass range based on samples collected in 2003-2007 are in progress and prospects will be discussed. The NA62 experiment starting in 2014 will search for a range of lepton number and lepton flavour violating decays of the charged kaon and the neutral pion at improved sensitivities down to 10-12, probing new physics scenarios involving, for example, heavy Majorana neutrinos. Prospects for the NA62 L0 trigger strategy for rare and forbidden decays will be discussed
RECENT RESULTS FROM NA62
No full textThe NA62 experiment at CERN SPS is aimed at collecting O(100) events of the ultra rare K+-> pi+ vu vubar decay with the background ∼10%. The data taking is supposed to start in 2014. In 2012 a part of the setup was commissioned during the Technical Run (TR). In this paper the experimental setup and selected results of the TR are briefly discussed
The kaon identification system in the NA62 experiment at CERN SPS
No full textThe main goal of the NA62 experiment at the CERN SPS accelerator is to measure the branching fraction of the ultra-rare decay K+→π+νbar nu with 10% accuracy. Key aspects of the detector configuration are described, with emphasis on tagging and timestamping the minority kaons in the high intensity, unseparated, charged-particle beam using KTAG, an upgraded version of a CEDAR differential Cherenkov detector. Data are presented showing that KTAG was successfully commissioned at CERN in November 2012
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