On the “Low” and “High” Energy CP Violation in Leptogenesis

2009 ◽  
Vol 188 ◽  
pp. 329-331
Author(s):  
S.T. Petcov
Keyword(s):  
Cp Violation ◽  
High Energy

scholarly journals CP VIOLATION AND BEAUTY DECAYS — A CASE STUDY OF HIGH IMPACT, HIGH SENSITIVITY AND EVEN HIGH PRECISION PHYSICS

2000 ◽  
Vol 15 (08) ◽  
pp. 1079-1156
Author(s):  
I. I. BIGI
Keyword(s):  
Cp Violation ◽  
Degrees Of Freedom ◽  
High Energy Physics ◽  
Dipole Moments ◽  
High Sensitivity ◽  
High Energy ◽  
New Physics ◽  
B Decays ◽  
New Paradigm ◽  
Parametric Reliability

The narrative of these lectures contains three main threads: (i) CP violation despite having so far been observed only in the decays of neutral kaons has been recognized as a phenomenon of truly fundamental importance. The KM ansatz constitutes the minimal implementation of CP violation: without requiring unknown degrees of freedom it can reproduce the known CP phenomenology in a nontrivial way. (ii) The physics of beauty hadrons — in particular their weak decays — opens a novel window onto fundamental dynamics: they usher in a new quark family (presumably the last one); they allow us to determine fundamental quantities of the Standard Model like the b quark mass and the CKM parameters V(cb), V(ub), V(ts) and V(td); they exhibit speedy or even rapid [Formula: see text] oscillations. (iii) Heavy Quark Expansions allow us to treat B decays with an accuracy that would not have been thought possible a mere decade ago. These three threads are joined together in the following manner: (a) Huge CP asymmetries are predicted in B decays, which represents a decisive test of the KM paradigm for CP violation. (b) Some of these predictions are made with high parametric reliability, which (c) can be translated into numerical precision through the judicious employment of novel theoretical technologies. (d) Beauty decays thus provide us with a rich and promising field to search for New Physics and even study some of its salient features. At the end of it there might quite possibly be a New Paradigm for High Energy Physics. There will be some other threads woven into this tapestry: electric dipole moments, and CP violation in other strange and in charm decays.

Design of a Polymeric Mini-Channelled System for the Cooling of a High-Energy Particle Detector at FERMILAB

2005 ◽  
Author(s):  
L. Chignoli ◽  
G. E. Cossali ◽  
M. Marengo
Keyword(s):  
Cp Violation ◽  
Standard Model ◽  
Mechanical Vibration ◽  
Silicon Layer ◽  
Particle Beam ◽  
High Energy ◽  
Department Of Energy ◽  
High Resistivity ◽  
High Signal ◽  
High Energy Particle

BTeV is a high-energy physics experiment, which is designed to proof several aspects of the so-called Standard Model. Precise measurements will reveal if the Standard Model contains breakdowns and therefore they will hint new matters for a more fundamental theory. One of BTeV’s main goals is to precisely measure CP violation in the beauty quark system. CP violation was first observed in strange quarks in 1963 and recently in beauty quarks at BaBar and Belle. CP violation causes particles and antiparticles to behave differently. The BTeV experiment was approved by FERMILAB and was currently being developed. In fact a very recent decision from the Department of Energy (February 2005) cancelled the project due to budget restrictions. A prototype of an innovative detector, called μ-strip detector, is under construction in a team leaded by an Italian group at INFN. The detector is based on copper strips deposited onto 300μm thick high resistivity bulk silicon. A hybrid electronic linked at the two terminals of the strips is positioned on the silicon layer. The system is inserted in a carbon fiber structure and then finally located around the particle beam. Even if the details of the electronic power dissipation and the chip geometry are not yet completely defined, the major constraints of the experiment (radiation hard structure, no mechanical vibration, high signal noise ratio with extremely low electrical charges, low atomic number of the components) have led the μ-strip team to make an effort in direction of a heat-sink based on a PEEK mini-tube system.

scholarly journals SUFFICIENTLY SMALL $\bar\theta$inSU(3)3 × S3 UNIFICATION MODEL

2002 ◽  
Vol 17 (23) ◽  
pp. 1513-1524 ◽  
Author(s):  
K. CHALUT ◽  
H. CHENG ◽  
P. H. FRAMPTON ◽  
K. STOWE ◽  
T. YOSHIKAWA
Keyword(s):  
Dipole Moment ◽  
Cp Violation ◽  
Electric Dipole ◽  
High Energy ◽  
Neutron Electric Dipole Moment ◽  
Standard Model Extension ◽  
Weak Decays ◽  
Up Quark ◽  
Model Extension ◽  
The Standard Model

Since CP violation in weak decays is successfully described by the KM mechanism, the strong CP problem cannot be easily accommodated. This leads us to reconsider the issue. If the axion and massless up quark are abandoned, we must extend the standard model. Extension to SU (3)3 × S3 unification leads to the following situation: if CP is a high-energy symmetry and the appropriate symmetry-breaking hierarchy of scales is in place, then the [Formula: see text] parameter of the QCD sub-theory is guaranteed to be sufficiently small. We find [Formula: see text] while the empirical limit from the neutron electric dipole moment requires only that [Formula: see text].

scholarly journals CP-violation in high-energy collisions of polarized protons

2001 ◽  
Vol 503 (3-4) ◽  
pp. 313-319 ◽  
Author(s):  
Sergey Kovalenko ◽  
Ivan Schmidt ◽  
Jacques Soffer
Keyword(s):  
Cp Violation ◽  
High Energy ◽  
Polarized Protons ◽  
High Energy Collisions

Searches for new, massive particles with AMO experiments

2019 ◽  
pp. 29-81
Author(s):  
David DeMille
Keyword(s):  
Dark Matter ◽  
Cp Violation ◽  
Particle Physics ◽  
High Energy ◽  
Higgs Bosons ◽  
Substantial Impact ◽  
Molecular Hamiltonian ◽  
Physics Experiments ◽  
Pedagogical Goal ◽  
New Particles

These lectures aim to explain how certain types of atomic, molecular, and optical physics experiments can have a substantial impact in modern particle physics. A central pedagogical goal is to describe, using only concepts familiar to atomic experimentalists, how new particles can lead to new terms in the atomic or molecular Hamiltonian. Well-motivated examples are discussed, including potential dark matter candidates known as “dark photons”, known and as-yet unknown Higgs bosons, and supersymmetric particles leading to CP violation. The observable effects of new Hamiltonian terms associated with these phenomena are worked out, and state-of-the-art strategies for detecting them, using atomic and molecular experiments, are described for some cases. Remarkably, the sensitivity of atomic/molecular experiments can make it possible to detect new particles even more massive than those that can be created directly at the largest high-energy colliders.

scholarly journals Correlations between low energy leptonic CP violation and leptogenesis in the light of recent experiments

2014 ◽  
Vol 29 (20) ◽  
pp. 1450104
Author(s):  
H. Zeen Devi
Keyword(s):  
Cp Violation ◽  
High Energy ◽  
Energy Scale ◽  
Low Energy ◽  
Type I ◽  
Planck Data ◽  
Cp Violations ◽  
Neutrino Sector ◽  
High Energy Scale ◽  
The Universe

Leptogenesis is the most favorable mechanism for generating the observed baryon asymmetry of the universe (BAU) which implies CP violation in the high energy scale. The low energy leptonic CP violation is expected to be observed in the neutrino oscillations and 0ν2β decay experiments. Generally, it is not possible to connect both the CP violations. Here we revisit the issue of connecting the two in flavored leptogenesis scenario within the Type I seesaw in the light of recent neutrino oscillation and Planck data. With the recent precise measurements of θ13 and BAU, we are able to find new correlations between the low and high energy CP violating phases when leptogenesis occurs at temperature between 109 to 1012 GeV and there is no contribution to CP violation from the heavy neutrino sector.

scholarly journals Explicit perturbations to the stabilizer τ = i of modular $$ {A}_5^{\prime } $$ symmetry and leptonic CP violation

2021 ◽  
Vol 2021 (7) ◽  
Author(s):  
Xin Wang ◽  
Shun Zhou
Keyword(s):  
Cp Violation ◽  
Small Deviation ◽  
High Energy ◽  
Energy Scale ◽  
Low Energy ◽  
Model Parameters ◽  
Theoretical Predictions ◽  
Flavor Mixing ◽  
Neutrino Mass Models ◽  
Cp Symmetry

Abstract In a class of neutrino mass models with modular flavor symmetries, it has been observed that CP symmetry is preserved at the fixed point (or stabilizer) of the modulus parameter τ = i, whereas significant CP violation emerges within the neighbourhood of this stabilizer. In this paper, we first construct a viable model with the modular $$ {A}_5^{\prime } $$ A 5 ′ symmetry, and explore the phenomenological implications for lepton masses and flavor mixing. Then, we introduce explicit perturbations to the stabilizer at τ = i, and present both numerical and analytical results to understand why a small deviation from the stabilizer leads to large CP violation. As low-energy observables are very sensitive to the perturbations to model parameters, we further demonstrate that the renormalization-group running effects play an important role in confronting theoretical predictions at the high-energy scale with experimental measurements at the low-energy scale.

scholarly journals THE HIGGS MASSES AND EXPLICIT CP VIOLATION IN THE GLUINO–AXION MODEL

2002 ◽  
Vol 17 (04) ◽  
pp. 215-230 ◽  
Author(s):  
MÜGE BOZ
Keyword(s):  
Experimental Data ◽  
Higgs Boson ◽  
Cp Violation ◽  
Parameter Space ◽  
High Energy ◽  
Recent Experimental Data ◽  
Restricted Parameter Space ◽  
Model Subject

In this work, we address the phenomenological consequences of explicit CP violation on direct Higgs–boson searches at high energy colliders. Having a restricted parameter space, we concentrate on the recently proposed gluino–axion model, and investigate the CP violation capability of the model subject to the recent experimental data. It is shown that the Higgs masses as well as their CP compositions are quite sensitive to the supersymmetric CP phases. The lightest Higgs is found to be nearly CP even to a good approximation whilst the remaining two heavy scalars do not have definite CP parities.

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