scholarly journals Recent Developments in Rare Kaon Decays

2003 ◽  
Vol 18 (19) ◽  
pp. 1273-1285 ◽  
Author(s):  
Giancarlo D'Ambrosio
Keyword(s):  
Standard Model ◽  
Short Distance ◽  
Kaon Decays ◽  
Distance Information ◽  
The Standard Model ◽  
Recent Developments ◽  
Theoretical Issues

We discuss theoretical issues in rare and radiative kaon decays. The interest is twofold: to extract useful short-distance information and understand the underlying dynamics. We emphasize channels where either we can understand nonperturbative aspects of QCD or there is a chance to test the Standard Model.

scholarly journals K → μ+μ− as a clean probe of short-distance physics

2021 ◽  
Vol 2021 (7) ◽  
Author(s):  
Avital Dery ◽  
Mitrajyoti Ghosh ◽  
Yuval Grossman ◽  
Stefan Schacht
Keyword(s):  
Matrix Element ◽  
Standard Model ◽  
Short Distance ◽  
Time Dependent ◽  
Final States ◽  
Interference Effects ◽  
Fundamental Theory ◽  
Long Distance ◽  
Ckm Matrix ◽  
The Standard Model

Abstract The K → μ+μ− decay is often considered to be uninformative of fundamental theory parameters since the decay is polluted by long-distance hadronic effects. We demonstrate that, using very mild assumptions and utilizing time-dependent interference effects, ℬ(KS → μ+μ−)ℓ=0 can be experimentally determined without the need to separate the ℓ = 0 and ℓ = 1 final states. This quantity is very clean theoretically and can be used to test the Standard Model. In particular, it can be used to extract the CKM matrix element combination $$ \mid {V}_{ts}{V}_{td}\sin \left(\beta +{\beta}_s\right)\mid \approx \mid {A}^2{\lambda}^5\overline{\eta}\mid $$ ∣ V ts V td sin β + β s ∣ ≈ ∣ A 2 λ 5 η ¯ ∣ with hadronic uncertainties below 1%.

scholarly journals Direct CP violation and the ΔI = 1/2 rule in K → ππ decay in the Standard Model

2022 ◽  
Vol 258 ◽  
pp. 01003
Author(s):  
Christopher Kelly
Keyword(s):  
Cp Violation ◽  
Standard Model ◽  
Systematic Error ◽  
Error Estimates ◽  
Lattice Calculation ◽  
Kaon Decays ◽  
The Standard Model

We discuss the RBC & UKQCD collaborations’ recent [1] lattice calculation of ϵ′, the measure of direct CP-violation in kaon decays. This result significantly improves on our previous 2015 calculation, with nearly 4× the statistics and more reliable systematic error estimates. We discuss how our results demonstrate the Standard Model origin of the ΔI = 1/2 rule, and present our plans for future calculations.

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 From old symmetries to new symmetries: Quarks, leptons and B-L

2014 ◽  
Vol 29 (29) ◽  
pp. 1430066 ◽  
Author(s):  
Rabindra N. Mohapatra
Keyword(s):  
Standard Model ◽  
Weak Interactions ◽  
Low Energy ◽  
Neutrino Masses ◽  
Beyond The Standard Model ◽  
The Standard Model ◽  
Recent Developments

The Baryon–Lepton difference (B-L) is increasingly emerging as a possible new symmetry of the weak interactions of quarks and leptons as a way to understand the small neutrino masses. There is the possibility that current and future searches at colliders and in low energy rare processes may provide evidence for this symmetry. This paper provides a brief overview of the early developments that led to B-L as a possible symmetry beyond the standard model, and also discusses some recent developments.

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.

TESTING NEWTONIAN GRAVITY AT ULTRA-SHORT DISTANCES

2001 ◽  
Vol 10 (01) ◽  
pp. 25-31 ◽  
Author(s):  
DENNIS E. KRAUSE ◽  
EPHRAIM FISCHBACH
Keyword(s):  
Standard Model ◽  
Short Distance ◽  
Electronic Effect ◽  
Intermolecular Forces ◽  
Newtonian Gravity ◽  
Newton’S Law ◽  
The Standard Model ◽  
Law Of Gravity ◽  
Fundamental Forces ◽  
Schematic Design

The appearance of new fundamental forces and extra-dimensional modifications to gravity in extensions of the Standard Model has motivated considerable interest in testing Newtonian gravity at ultra-short distances (≲10-4 m ). New experiments which attempt to probe these distances will encounter formidable new obstacles, including large intermolecular forces, which could obscure weak new forces or small modifications to Newton's law of gravity. Here we will review the motivation for conducting such ultra-short distance gravity experiments, and discuss some of the new problems that may arise in future experiments. Finally, we suggest a schematic design for a null experiment which would address some of these problems using the "iso-electronic" effect.

scholarly journals Data-driven approaches to the evaluation of hadronic contributions to the (g − 2)μ

2022 ◽  
Vol 258 ◽  
pp. 01004
Author(s):  
Gilberto Colangelo
Keyword(s):  
Standard Model ◽  
Theoretical Calculation ◽  
Magnetic Moment ◽  
Anomalous Magnetic Moment ◽  
White Paper ◽  
Data Driven ◽  
The Standard Model ◽  
Recent Developments

In this talk I reviewed the data-driven theoretical calculation of the hadronic contributions to the anomalous magnetic moment of the muon in the Standard Model mainly as it has been presented in the White Paper, but also including the most recent developments. All this is presented in the light of the new measurement of (g − 2)μ recently released by the Fermilab experiment, which led to an increase of the discrepancy with the Standard Model from 3.7 to 4.2σ.

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