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 SEARCHING FOR NEW PHYSICS IN LEPTONIC DECAYS OF BOTTOMONIUM

2002 ◽  
Vol 17 (34) ◽  
pp. 2265-2276 ◽  
Author(s):  
MIGUEL ANGEL SANCHIS-LOZANO
Keyword(s):  
Standard Model ◽  
Structural Transition ◽  
New Physics ◽  
Decay Rates ◽  
Vector Resonance ◽  
Continuum State ◽  
Leptonic Decays ◽  
Lepton Universality ◽  
Text Production ◽  
The Standard Model

New physics can show up in various well-known processes already studied in the Standard Model, in particular by modifying decay rates to some extent. In this work we examine leptonic decays of ϒ resonances of bottomonium below [Formula: see text] production, subsequent to a magnetic dipole radiative structural transition of the vector resonance yielding a pseudoscalar continuum state, searching for the existence of a light Higgs-like neutral boson that would imply a slight but experimentally measurable breaking of lepton universality.

scholarly journals Status of the NA62 Experiment

2020 ◽  
Vol 234 ◽  
pp. 01012
Author(s):  
M. Piccini
Keyword(s):  
Data Analysis ◽  
Standard Model ◽  
Indirect Effects ◽  
Branching Ratio ◽  
New Physics ◽  
Single Event ◽  
Model Framework ◽  
The Standard Model ◽  
Better Than

The decay $ {K^ + } \to {\pi ^ + }v\bar v $, with a very precisely predicted branching ratio of less than 10−10 in the Standard Model framework, is one of the best candidates to reveal indirect effects of new physics at the highest mass scales. The NA62 experiment at CERN SPS is designed to measure the branching ratio of such decay with a decay-in-flight technique, novel for this channel. The main goal of NA62 is to measure such Branching Ratio of $ {K^ + } \to {\pi ^ + }v\bar v $ with an accuracy better than 20%. This will be achieved by collecting up to 100 $ {K^ + } \to {\pi ^ + }v\bar v $ events with a background contamination at the level of 10%. The NA62 detector was commissioned in 2014 and 2015 and the experiment took physics data from 2015 to 2018. NA62 has already published the result of the 2016 data analysis. The 2017 data analysis is in progress, the single event sensitivity reached and the evaluation of the main backgrounds will be shown in this contribution.

scholarly journals SEARCH FOR $K^{+} \to \pi^{+} \nu \bar{\nu}$ DECAYS AT NA62 EXPERIMENT AT CERN

2014 ◽  
Vol 35 ◽  
pp. 1460422
Author(s):  
PAOLO MASSAROTTI
Keyword(s):  
Standard Model ◽  
Kaon Decays ◽  
Analysis Technique ◽  
The Standard Model

Rare kaon decays provide unique opportunity to test the Standard Model and probe its possible extensions. The primary goal of the NA62 experiment is the measurement of the [Formula: see text] decay with a precision of 10% in two years of data taking. The detector setup together with the analysis technique is described.

scholarly journals Experimental Review on Lepton Universality and Lepton Flavour Violation tests in B decays

2020 ◽  
Vol 234 ◽  
pp. 01004 ◽  
Author(s):  
P. de Simone
Keyword(s):  
Standard Model ◽  
Theoretical Models ◽  
New Physics ◽  
B Decays ◽  
Experimental Status ◽  
Lepton Flavour Violation ◽  
Lepton Universality ◽  
The Standard Model ◽  
Flavour Violation ◽  
Lepton Flavour

Tests of lepton flavour universality in B decays offer an excellent opportunity to test the Standard Model, and show hints of new physics in analyses performed by the LHCb, Belle and BaBar experiments. Several theoretical models proposed to explain possible violation of lepton flavour universality claim a connection with lepton flavour violation in B decays. These proceedings review the experimental status of the tests of lepton flavour universality and the searches of lepton flavour violation in B decays.

scholarly journals Searching for new physics in semi-leptonic baryon decays

2017 ◽  
Vol 32 (08) ◽  
pp. 1750043 ◽  
Author(s):  
E. Di Salvo ◽  
Z. J. Ajaltouni
Keyword(s):  
Standard Model ◽  
Decay Width ◽  
Form Factors ◽  
New Physics ◽  
Scalar Coupling ◽  
Partial Decay Width ◽  
Beyond The Standard Model ◽  
Leptonic Decays ◽  
The Standard Model ◽  
Pseudo Scalar

We propose two different and complementary observables for singling out possible signals of physics beyond the Standard Model (SM) in the semi-leptonic decays [Formula: see text], both with the [Formula: see text] lepton and with a light lepton. The two observables are the partial decay width and a T-odd asymmetry, whose respective sensitivities to scalar and/or pseudo-scalar coupling are calculated as functions of the parameters characterizing new physics (NP). Two different form factors are used. Three particular cases are discussed and analyzed in detail.

scholarly journals Probing lepton universality with (semi)-leptonic B decays

2019 ◽  
Author(s):  
Giovanni Banelli ◽  
Robert Fleischer ◽  
Ruben Jaarsma ◽  
Gilberto Tetlalmatzi-Xolocotzi
Keyword(s):  
Standard Model ◽  
Branching Fraction ◽  
Branching Fractions ◽  
Belle Collaboration ◽  
New Physics ◽  
Recent Measurement ◽  
Beyond The Standard Model ◽  
Lepton Universality ◽  
Highly Sensitive ◽  
The Standard Model

The most recent measurements of the observables R_{D^{(*)}}RD(*) are in tension with the Standard Model offering hints of New Physics in b\rightarrow c \ell \bar{\nu}_{\ell}b→cℓν‾ℓ transitions. Motivated by these results, in this work we present an analysis on their b\rightarrow u \ell \bar{\nu}_{\ell}b→uℓν‾ℓ counterparts (for \ell=e, ~\mu, ~\tauℓ=e,μ,τ). Our study has three main objectives. Firstly, using ratios of branching fractions, we assess the effects of beyond the Standard Model scalar and pseudoscalar particles in leptonic and semileptonic BB decays (B^-\rightarrow \ell^- \bar{\nu}_{\ell}B−→ℓ−ν‾ℓ, \bar{B}\rightarrow \pi \ell \bar{\nu}_{\ell}B‾→πℓν‾ℓ and \bar{B}\rightarrow \rho \ell \bar{\nu}_{\ell}B‾→ρℓν‾ℓ). Here a key role is played by the leptonic BB processes, which are highly sensitive to new pseudoscalar interactions. In particular, we take advantage of the most recent measurement of the branching fraction of the channel B^-\rightarrow \mu^-\bar{\nu}_{\mu}B−→μ−ν‾μ by the Belle collaboration. Secondly, we extract the CKM matrix element |V_{ub}||Vub| while accounting simultaneously for New Physics contributions. Finally, we provide predictions for the branching fractions of yet unmeasured leptonic and semileptonic BB decays.

scholarly journals Developments in Rare Kaon Decay Physics

2000 ◽  
Vol 50 (1) ◽  
pp. 249-297 ◽  
Author(s):  
A.R. Barker ◽  
S.H. Kettell
Keyword(s):  
Standard Model ◽  
New Physics ◽  
High Mass ◽  
Current Status ◽  
Model Parameters ◽  
Beyond The Standard Model ◽  
Kaon Decay ◽  
Kaon Decays ◽  
The Standard Model

▪ Abstract  We review the current status of the field of rare kaon decays. The study of rare kaon decays has played a key role in the development of the standard model, and the field continues to have significant impact. The two areas of greatest import are the search for physics beyond the standard model and the determination of fundamental standard-model parameters. Due to the exquisite sensitivity of rare kaon decay experiments, searches for new physics can probe very high mass scales. Studies of the K → π ν[Formula: see text] modes in particular, where the first event has recently been seen, will permit tests of the standard-model picture of quark mixing and CP violation.

New physics from the CERN collider

1986 ◽  
Vol 404 (1827) ◽  
pp. 213-232 ◽  
Keyword(s):  
Standard Model ◽  
Top Quark ◽  
Weak Interactions ◽  
New Physics ◽  
Experimental Results ◽  
Missing Energy ◽  
The Standard Model

Experimental results from the CERN collider, having features that may not be explicable within the standard model of the strong, electromagnetic, and weak interactions, are described. They include events with dimuons and events with jets accompanied by missing energy. The evidence for the top quark is also presented.

scholarly journals Experimental status of LNU in B decays in LHCb

2019 ◽  
Author(s):  
Sean Benson
Keyword(s):  
Standard Model ◽  
Semileptonic Decays ◽  
Experimental Tests ◽  
New Physics ◽  
B Decays ◽  
Experimental Status ◽  
Lepton Universality ◽  
Highly Sensitive ◽  
The Standard Model ◽  
Charged Leptons

In the Standard Model, the three charged leptons are identical copies of each other, apart from mass differences. Experimental tests of this feature in semileptonic decays of -hadrons are highly sensitive to New Physics particles which preferentially couple to the 2nd and 3rd generations of leptons. A review of the latest lepton universality tests in semileptonic transitions at is reported.

scholarly journals sitoolbox: A package for Bayesian estimation of the isotropy violation in the CMB sky

2019 ◽  
Vol 489 (4) ◽  
pp. 5889-5899 ◽  
Author(s):  
Santanu Das
Keyword(s):  
Data Analysis ◽  
Standard Model ◽  
Cosmic Microwave Background ◽  
Bayesian Estimation ◽  
Software Package ◽  
Microwave Background ◽  
Data Analysis Technique ◽  
Analysis Technique ◽  
The Standard Model ◽  
Measurement Effects

ABSTRACT The standard model of cosmology predicts a statistically isotropic (SI) cosmic microwave background (CMB) sky. However, the SI violation signals are always present in an observed sky-map. Different cosmological artefacts, measurement effects, and unavoidable effects during data analysis, etc. may lead to isotropy violation in an otherwise SI sky. Therefore, a proper data analysis technique should calculate all these SI violation signals, so that they can be matched with SI violation signals from the known sources, and then conclude if there is any intrinsic SI violation in the CMB sky. In one of our recent works, we presented a general Bayesian formalism for measuring the isotropy violation signals in the CMB sky in the presence of an idealized isotropic noise. In this paper, we have extended the mechanism and develop a software package, sitoolbox, for measuring SI violation in presence of anisotropic noise and masking.

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