scholarly journals Rephasing invariance and permutation symmetry in flavor physics

2020 ◽  
Vol 80 (3) ◽  
Author(s):  
T. K. Kuo ◽  
S. H. Chiu
Keyword(s):  
Standard Model ◽  
Flavor Physics ◽  
Permutation Symmetry ◽  
Mixing Parameters ◽  
The Standard Model ◽  
Flavor Mixing ◽  
Physical Variables

AbstractWith some modifications, the arguments for rephasing invariance can be used to establish permutation symmetry for the standard model. The laws of evolution of physical variables, which transform as tensors under permutation, are found to obey the symmetry, explicitly. We also propose to use a set of four mixing parameters, with unique properties, which may serve to characterize flavor mixing.

scholarly journals Flavor Mixing and the Permutation Symmetry among Generations

2020 ◽  
Vol 2020 ◽  
pp. 1-8 ◽  
Author(s):  
T. K. Kuo ◽  
S. H. Chiu
Keyword(s):  
Renormalization Group ◽  
Standard Model ◽  
Symmetry Group ◽  
Mass Matrix ◽  
Symmetry Operation ◽  
Permutation Symmetry ◽  
Renormalization Group Equations ◽  
The Standard Model ◽  
Flavor Mixing ◽  
Physical Variables

In the standard model, the permutation symmetry among the three generations of fundamental fermions is usually regarded to be broken by the Higgs couplings. It is found that the symmetry is restored if we include the mass matrix parameters as physical variables which transform appropriately under the symmetry operation. Known relations between these variables, such as the renormalization group equations, as well as formulas for neutrino oscillations (in vacuum and in matter), are shown to be covariant tensor equations under the permutation symmetry group.

scholarly journals Theoretical challenges for flavor physics

2021 ◽  
Vol 136 (9) ◽  
Author(s):  
Yuval Grossman ◽  
Zoltan Ligeti
Keyword(s):  
Standard Model ◽  
Flavor Physics ◽  
Beyond The Standard Model ◽  
Physics Program ◽  
The Standard Model ◽  
Nonperturbative Qcd ◽  
Near Future ◽  
Better Than

AbstractWe discuss some highlights of the FCC-$$ee$$ ee flavor physics program. It will help to explore various aspects of flavor physics: to test precision calculations, to probe nonperturbative QCD methods, and to increase the sensitivity to physics beyond the standard model. In some areas, FCC-$$ee$$ ee will do much better than current and near-future experiments. We briefly discuss several probes that can be relevant for maximizing the gain from the FCC-$$ee$$ ee flavor program.

scholarly journals Flavor physics: Precision as an avenue to discovery

2020 ◽  
Vol 35 (01) ◽  
pp. 1930018
Author(s):  
Diego Guadagnoli
Keyword(s):  
Cp Violation ◽  
Standard Model ◽  
Flavor Physics ◽  
Standard Model Prediction ◽  
New Physics ◽  
Effective Theory ◽  
Theory Approach ◽  
Long Distance ◽  
The Standard Model ◽  
The Impact

This paper describes the work pursued in the years 2008–2013 on improving the Standard Model prediction of selected flavor-physics observables. The latter includes: (1) [Formula: see text], that quantifies indirect CP violation in the [Formula: see text] system and (2) the very rare decay [Formula: see text], recently measured at the LHC. Concerning point (1), the paper describes our reappraisal of the long-distance contributions to [Formula: see text],[Formula: see text] that have permitted to unveil a potential tension between CP violation in the [Formula: see text]- and [Formula: see text]-system. Concerning point (2), the paper gives a detailed account of various systematic effects pointed out in Ref. 4 and affecting the Standard Model [Formula: see text] decay rate at the level of 10% — hence large enough to be potentially misinterpreted as nonstandard physics, if not properly included. The paper further describes the multifaceted importance of the [Formula: see text] decays as new physics probes, for instance how they compare with [Formula: see text]-peak observables at LEP, following the effective-theory approach of Ref. 5. Both cases (1) and (2) offer clear examples in which the pursuit of precision in Standard Model predictions offered potential avenues to discovery. Finally, this paper describes the impact of the above results on the literature, and what is the further progress to be expected on these and related observables.

scholarly journals Heavy neutrino searches at future Z-factories

2019 ◽  
Vol 79 (9) ◽  
Author(s):  
Jian-Nan Ding ◽  
Qin Qin ◽  
Fu-Sheng Yu
Keyword(s):  
Standard Model ◽  
Cross Sections ◽  
Upper Bounds ◽  
Minimal Extension ◽  
Neutrino Sector ◽  
Mixing Parameters ◽  
The Standard Model ◽  
Background Events ◽  
Sigma E ◽  
Two Jets

Abstract We analyze the capacity of future Z-factories to search for heavy neutrinos with their mass from 10 to 85 GeV. The heavy neutrinos N are considered to be produced via the process $$e^+e^-\rightarrow Z\rightarrow \nu N$$e+e-→Z→νN and to decay into an electron or muon and two jets. By means of Monte Carlo simulation of such signal events and the Standard Model background events, we obtain the upper bounds on the cross sections $$\sigma (e^+e^-\rightarrow \nu N\rightarrow \nu \ell jj)$$σ(e+e-→νN→νℓjj) given by the Z-factories with integrated luminosities of 0.1, 1 and 10 $$\hbox {ab}^{-1}$$ab-1 if no signal events are observed. Under the assumption of a minimal extension of the Standard Model in the neutrino sector, we also present the corresponding constraints on the mixing parameters of the heavy neutrinos with the Standard Model leptons, and find they are improved by at least one order compared to current experimental constraints.

scholarly journals Status of Charm Flavor Physics

2006 ◽  
Vol 21 (27) ◽  
pp. 5381-5403 ◽  
Author(s):  
Ian Shipsey
Keyword(s):  
Cp Violation ◽  
Standard Model ◽  
Flavor Physics ◽  
Form Factors ◽  
New Physics ◽  
Model Description ◽  
Beyond The Standard Model ◽  
Physics Program ◽  
The Standard Model ◽  
The Status

The role of charm in testing the Standard Model description of quark mixing and CP violation through measurements of lifetimes, decay constants and semileptonic form factors is reviewed. Together with Lattice QCD, charm has the potential this decade to maximize the sensitivity of the entire flavor physics program to new physics and pave the way for understanding physics beyond the Standard Model at the LHC in the coming decade. The status of indirect searches for physics beyond the Standard Model through charm mixing, CP-violation and rare decays is also reported.

scholarly journals MIXING IN THE D0 SYSTEM RESULTS FROM COLLIDER EXPERIMENTS

2003 ◽  
Vol 18 (01) ◽  
pp. 1-22 ◽  
Author(s):  
MONIKA GROTHE
Keyword(s):  
Standard Model ◽  
Experimental Observation ◽  
New Physics ◽  
Beyond The Standard Model ◽  
Symmetry Violation ◽  
Mixing Parameters ◽  
Statistical Precision ◽  
The Standard Model ◽  
Charge Parity ◽  
Cp Symmetry

Mixing in the D0 system may provide a sensitive probe for new physics beyond the Standard Model (SM) but has so far eluded experimental observation. The SM predictions are typically small (< 10-3) for the mixing parameters x, y which, in the absence of charge-parity (CP) symmetry violation, measure the mass (x = Δ m/Γ) and lifetime (y = ΔΓ/2Γ) difference of the CP eigenstates in the D0 system. The asymmetric B-factory experiments BABAR and Belle open up the opportunity of measuring x, y with unprecedented statistical precision and sample purities. Results from BABAR and Belle, and from CLEO are reviewed.

scholarly journals CHARM MIXING IN THE STANDARD MODEL AND BEYOND

2006 ◽  
Vol 21 (27) ◽  
pp. 5686-5693 ◽  
Author(s):  
ALEXEY A. PETROV
Keyword(s):  
Cp Violation ◽  
Standard Model ◽  
New Physics ◽  
Mixing Parameters ◽  
The Standard Model ◽  
Theoretical Predictions ◽  
Charm Mixing

The motivation most often cited in searches for [Formula: see text] mixing and CP-violation in charm system lies with the possibility of observing a signal from New Physics which dominates that from the Standard Model. We review recent theoretical predictions and experimental constraints on [Formula: see text] mixing parameters, concentrating on possible effects of New Physics.

CHARM DECAYS WITHIN THE STANDARD MODEL AND BEYOND

2006 ◽  
Vol 21 (08n09) ◽  
pp. 1697-1709 ◽  
Author(s):  
MARINA ARTUSO
Keyword(s):  
Standard Model ◽  
Charm Quark ◽  
New Physics ◽  
Charm Physics ◽  
Experimental Information ◽  
Charm Decays ◽  
Mixing Parameters ◽  
The Standard Model ◽  
The Status ◽  
Good Agreement

The charm quark has unique properties that make it a very important probe of many facets of the Standard Model. New experimental information on charm decays is becoming available from dedicated experiments at charm factories, and through charm physics programs at the b-factories and hadron machines. In parallel, theorists are working on matrix element calculations based on unquenched lattice QCD, that can be validated by experimental measurements and affect our ultimate knowledge of the quark mixing parameters. Recent predictions are compared with corresponding experimental data and good agreement is found. Charm decays can also provide unique new physics signatures; the status of present searches is reviewed. Finally, charm data relevant for improving beauty decay measurements are presented.

scholarly journals Parametrization of flavor mixing in the standard model

1998 ◽  
Vol 57 (1) ◽  
pp. 594-597 ◽  
Author(s):  
Harald Fritzsch ◽  
Zhi-zhong Xing
Keyword(s):  
Standard Model ◽  
The Standard Model ◽  
Flavor Mixing
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