scholarly journals Limits on Heavy Neutrinos at NA48/2 and NA62

2018 ◽  
Vol 46 ◽  
pp. 1860043
Author(s):  
Lubos Bician
Keyword(s):  
Data Analysis ◽  
Heavy Neutrino ◽  
Charged Kaon ◽  
Kaon Decays ◽  
Large Samples ◽  
Neutrino Production ◽  
Upper Limits

Large samples of charged kaon decays have been collected by the NA48/2 (2003-2004), the NA62-R[Formula: see text] (2007) and the NA62 (2015) experiments at CERN SPS. This proceedings summarizes upper limits on heavy neutrino production measured by these experiments. The results from the 2015 data analysis at the NA62 experiment are preliminary.

Search for heavy neutral leptons at the NA62 experiment at CERN

2018 ◽  
Vol 33 (31) ◽  
pp. 1844026
Author(s):  
Michal Zamkovsky
Keyword(s):  
Neutrino Mixing ◽  
Charged Kaon ◽  
Kaon Decays ◽  
Upper Limits ◽  
Neutral Lepton ◽  
Mixing Matrix

Search for heavy neutral lepton (HNL) production in charged kaon decays using the data collected by kaon experiments NA48/2 and NA62 at CERN are reported. Upper limits are established on the elements of the extended neutrino mixing matrix for heavy neutral lepton mass in the range 130–450 MeV, improving on the results from previous HNL production search.

scholarly journals MEASUREMENT OF THE RATIO OF THE CHARGED KAON LEPTONIC DECAYS AT NA62

2014 ◽  
Vol 35 ◽  
pp. 1460436
Author(s):  
VENELIN KOZHUHAROV
Keyword(s):  
Data Analysis ◽  
Standard Model ◽  
Weak Interactions ◽  
New Physics ◽  
Charged Kaon ◽  
Kaon Decays ◽  
Leptonic Decays ◽  
Lepton Universality ◽  
Analysis Technique ◽  
The Standard Model

The ratio of the leptonic charged kaon decays RK = Γ(K± → e±ν)/Γ(K± → μ±ν) is sensitive to the structure of the weak interactions and can be precisely calculated within the Standard Model. Presence of New Physics can introduce a shift on its value of the order of a percent. The NA62 experiment at CERN SPS used data from a dedicated run in 2007 to perform a measurement of this ratio and probe the lepton universality. The data analysis technique and the final results are presented.

scholarly journals Search for heavy neutrinos at the NA48/2 and NA62 experiments at CERN

2018 ◽  
Vol 182 ◽  
pp. 02095
Author(s):  
Peruzzo Letizia
Keyword(s):  
Charged Kaon ◽  
Kaon Decay ◽  
Kaon Decays ◽  
Large Samples ◽  
Neutral Lepton

The NA48/2 experiment at CERN has collected large samples of charged kaons decaying into a pion and two muons for the search of heavy nuetrinos. In addition, its successor NA62 has set new limits on the rate of charged kaon decay into a heavy neutral lepton (HNL) and a lepton, with l = e; μ, using the data collected in 2007 and 2015. New limits on heavy neutrinos from kaon decays into pions, muons and positrons are presented in this report.

Kaon physics at the CERN-SPS

2015 ◽  
Vol 39 ◽  
pp. 1560100
Author(s):  
Mario Vormstein
Keyword(s):  
Kaon Physics ◽  
Current Status ◽  
Photon Mass ◽  
Kaon Decay ◽  
Kaon Decays ◽  
Preliminary Results ◽  
Dark Photon ◽  
Mixing Parameter ◽  
Upper Limits ◽  
Photon Signal

The NA48/2 and NA62 collaborations report on recent results, current status, and prospects of kaon physics at the CERN-SPS. The NA62 collaborations aims to measure the decay [Formula: see text] with an uncertainty of 10% or better. The NA62 detector and preliminary results from a pilot run in 2014 are presented. In addition, recent results of the NA48/2 collaboration are reported. A search for Dark Photons has been performed in [Formula: see text] decays via the kaon decays [Formula: see text] and [Formula: see text]. No dark photon signal was observed and new upper limits on the mixing parameter [Formula: see text] and the dark photon mass were computed. We also report the first observation of the kaon decay [Formula: see text].

scholarly journals CPviolation in the heavy neutrino production processe+e−→N1N2

1995 ◽  
Vol 51 (9) ◽  
pp. 4707-4711 ◽  
Author(s):  
J. Gluza ◽  
M. Zrałek
Keyword(s):  
Heavy Neutrino ◽  
Neutrino Production

scholarly journals Discovering Language Properties through Corpus-Based Dictionary Data Analysis

2017 ◽  
Vol 6 (2) ◽  
pp. 61-70
Author(s):  
Paul Lyddon ◽  
Keyword(s):  
Data Analysis ◽  
Language Use ◽  
State Of The Art ◽  
Structural Characteristics ◽  
Language Teacher ◽  
Linguistic Data ◽  
Large Samples ◽  
Widespread Availability ◽  
Real Language

To reveal underlying patterns in real language use, linguists have increasingly come to rely on corpus analyses, involving the evaluation of statistical frequencies in generally sizable bodies of natural linguistic data. However, accessing and analyzing large samples of raw language is neither always practical nor even truly necessary, especially in cases pertaining to structural characteristics. In fact, the requisite data can oftentimes be gleaned from a state-of-the-art (i.e., corpus-based) dictionary. Moreover, given the widespread availability of easily searchable electronic dictionaries nowadays, almost any language teacher or learner can use one to answer a number of these types of queries. This paper illustrates this claim with a step-by-step analysis of corpus-based dictionary data for the purpose of formulating the sound-symbol relations in English words with vowels preceding –gh.

scholarly journals Search for heavy neutral leptons in $$W^+\rightarrow \mu ^{+}\mu ^{\pm }\, \text {jet}$$ decays

2021 ◽  
Vol 81 (3) ◽  
Author(s):  
R. Aaij ◽  
◽  
C. Abellán Beteta ◽  
T. Ackernley ◽  
B. Adeva ◽  
...  
Keyword(s):  
Mass Range ◽  
Lepton Number ◽  
Heavy Neutrino ◽  
Proton Collision ◽  
Final State ◽  
Data Set ◽  
Proton Proton ◽  
Upper Limits ◽  
The Standard Model ◽  
Proton Proton Collision

AbstractA search is performed for heavy neutrinos in the decay of a W boson into two muons and a jet. The data set corresponds to an integrated luminosity of approximately $$3.0\, \text {fb} ^{-1} $$ 3.0 fb - 1 of proton–proton collision data at centre-of-mass energies of 7 and $$8\, \text {TeV} $$ 8 TeV collected with the LHCb experiment. Both same-sign and opposite-sign muons in the final state are considered. Data are found to be consistent with the expected background. Upper limits on the coupling of a heavy neutrino with the Standard Model neutrino are set at $$95\%$$ 95 % confidence level in the heavy-neutrino mass range from 5 to $$50\, \text {GeV/}c^2 $$ 50 GeV/ c 2 . These are of the order of $$10^{-3}$$ 10 - 3 for lepton-number-conserving decays and of the order of $$10^{-4}$$ 10 - 4 for lepton-number-violating heavy-neutrino decays.

Automating Analysis of Fibrous Materials

1998 ◽  
Vol 4 (S2) ◽  
pp. 836-837
Author(s):  
Randall R. Bresee ◽  
Zanyao Yan
Keyword(s):  
Data Analysis ◽  
Natural Fibers ◽  
Fibrous Materials ◽  
Depth Of Focus ◽  
Measuring Process ◽  
Large Samples ◽  
Large Numbers ◽  
Data Acquisition Process ◽  
Automate Microscope

Natural fibers generally lack uniformity and large numbers of measurements often must be obtained to achieve estimates of sample parameters having reasonable levels of precision and confidence. This problem calls for automating the measurement and data analysis processes so obtaining a large amount of data is practical. We will discuss hardware and software designs used in our laboratory to automate microscope measurements and data analysis for fibrous materials.Automating the measuring process requires constructing hardware to accomplish several tasks. Hardware should accommodate large-sized samples when they lack uniformity since many measurements are desirable. Sample positioning should be automated to remove the operator from the data acquisition process and eliminate a source of operator-dependent positioning error. Lens focusing should be automated since it is difficult to maintain flatness for large samples and the thickness of many samples exceeds the depth-of-focus of lenses. Finally, the quality of illumination provided to all sample locations during measurement should be flexible and consistent.

scholarly journals Fully automated precision predictions for heavy neutrino production mechanisms at hadron colliders

2016 ◽  
Vol 94 (5) ◽  
Author(s):  
Céline Degrande ◽  
Olivier Mattelaer ◽  
Richard Ruiz ◽  
Jessica Turner
Keyword(s):  
Heavy Neutrino ◽  
Hadron Colliders ◽  
Neutrino Production ◽  
Production Mechanisms
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