THE CONNECTION BETWEEN LOW-ENERGY LEPTONIC CP-VIOLATION AND LEPTOGENESIS

2005 ◽  
Vol 20 (07) ◽  
pp. 477-490 ◽  
Author(s):  
SILVIA PASCOLI
Keyword(s):  
Cp Violation ◽  
Neutrino Oscillations ◽  
Baryon Asymmetry ◽  
Low Energy ◽  
Seesaw Mechanism ◽  
Mixing Matrix ◽  
Energy Processes ◽  
The Universe

Within the context of the seesaw mechanism, we review the possible connection between the CP-violating phases which appear in the lepton unitary mixing matrix and are measurable in neutrino oscillations and other low-energy processes, with the ones which play a role in the generation of the baryon asymmetry of the universe through the leptogenesis mechanism.

NEUTRINO MIXING, LEPTONIC CP VIOLATION, THE SEESAW MECHANISM AND BEYOND

2010 ◽  
Vol 25 (23) ◽  
pp. 4325-4337 ◽  
Author(s):  
S. T. PETCOV
Keyword(s):  
Cp Violation ◽  
Neutrino Mass ◽  
Baryon Asymmetry ◽  
Neutrino Mixing ◽  
Mass Generation ◽  
Seesaw Mechanism ◽  
Mixing Matrix ◽  
Neutrino Mass Generation ◽  
The Universe

The phenomenology of 3-neutrino mixing and of the related Dirac and Majorana leptonic CP violation is reviewed. The leptogenesis scenario of generation of the baryon asymmetry of the Universe, which is based on the see-saw mechanism of neutrino mass generation, is considered. The results showing that the CP violation necessary for the generation of the baryon asymmetry of the Universe in leptogenesis can be due exclusively to the Dirac and/or Majorana CP-violating phase(s) in the neutrino mixing matrix U are briefly reviewed.

scholarly journals NEUTRINOS AND THE MATTER-ANTIMATTER ASYMMETRY IN THE UNIVERSE

2011 ◽  
Vol 20 (supp01) ◽  
pp. 56-64
Author(s):  
RICARDO GONZÁLEZ FELIPE
Keyword(s):  
Neutrino Physics ◽  
Particle Physics ◽  
Neutrino Oscillations ◽  
Baryon Asymmetry ◽  
Neutrino Masses ◽  
Seesaw Mechanism ◽  
Challenging Issue ◽  
Puzzling Problem ◽  
The Universe

The discovery of neutrino oscillations provides a solid evidence for nonzero neutrino masses and leptonic mixing. The fact that neutrino masses are so tiny constitutes a puzzling problem in particle physics. From the theoretical viewpoint, the smallness of neutrino masses can be elegantly explained through the seesaw mechanism. Another challenging issue for particle physics and cosmology is the explanation of the matter-antimatter asymmetry observed in Nature. Among the viable mechanisms, leptogenesis is a simple and well-motivated framework. In this paper we briefly review these aspects, making emphasis on the possibility of linking neutrino physics to the cosmological baryon asymmetry originated from leptogenesis.

scholarly journals Leptonic CP violation and leptogenesis

2014 ◽  
Vol 29 (11n12) ◽  
pp. 1430028 ◽  
Author(s):  
S. T. Petcov
Keyword(s):  
Cp Violation ◽  
Neutrino Mass ◽  
Mass Scale ◽  
Baryon Asymmetry ◽  
Current Status ◽  
Neutrino Mixing ◽  
Mass Generation ◽  
Mixing Matrix ◽  
Neutrino Mass Generation ◽  
The Universe

The phenomenology of 3-neutrino mixing, the current status of our knowledge about the 3-neutrino mixing parameters, including the absolute neutrino mass scale, and of the Dirac and Majorana CP violation in the lepton sector, are reviewed. The problems of CP violation in neutrino oscillations and of determining the nature — Dirac or Majorana — of massive neutrinos, are discussed. The seesaw mechanism of neutrino mass generation and the related leptogenesis scenario of generation of the baryon asymmetry of the universe, are considered. The results showing that the CP violation necessary for the generation of the baryon asymmetry of the universe in leptogenesis can be due exclusively to the Dirac and/or Majorana CP-violating phase(s) in the neutrino mixing matrix U, are briefly reviewed.

scholarly journals Unitarity of neutrino mixing matrix

2019 ◽  
Vol 206 ◽  
pp. 09009
Author(s):  
Ha Nguyen Thi Kim ◽  
Van Nguyen Thi Hong ◽  
Son Cao Van
Keyword(s):  
Cp Violation ◽  
Neutrino Oscillations ◽  
Graphical Form ◽  
Muon Neutrinos ◽  
Neutrino Mixing ◽  
Electron Neutrinos ◽  
Tau Neutrinos ◽  
The Matrix ◽  
Mixing Matrix ◽  
Unitary Triangle

Neutrinos are neutral leptons and there exist three types of neutrinos (electron neutrinos νe, muon neutrinos νµ and tau neutrinos ντ). These classifications are referred to as neutrinos’s “flavors”. Oscillations between the different flavors are known as neutrino oscillations, which occurs when neutrinos have mass and non-zero mixing. Neutrino mixing is governed by the PMNS mixing matrix. The PMNS mixing matrix is constructed as the product of three independent rotations. With that, we can describe the numerical parameters of the matrix in a graphical form called the unitary triangle, giving rise to CP violation. We can calculate the four parameters of the mixing matrix to draw the unitary triangle. The area of the triangle is a measure of the amount of CP violation.

BARYOGENESIS IN AN SO(10) GUT MODEL WITH PATI–SALAM INTERMEDIATE SYMMETRY

1998 ◽  
Vol 13 (19) ◽  
pp. 1539-1546
Author(s):  
F. BUCCELLA ◽  
O. PISANTI ◽  
L. ROSA
Keyword(s):  
Experimental Data ◽  
Symmetry Breaking ◽  
Spontaneous Symmetry Breaking ◽  
Neutrino Oscillations ◽  
Baryon Asymmetry ◽  
Gauge Model ◽  
Electroweak Scale ◽  
Proton Lifetime ◽  
The Universe ◽  
Breaking Scale

The possibility of generating the observed baryon asymmetry of the universe in an SO(10) gauge model with spontaneous symmetry breaking pattern [Formula: see text] is studied. We find it possible to generate a [Formula: see text], converting the leptonic number produced at the B- L breaking scale via the B+L violating processes mediated by sphalerons at the electroweak scale. The resulting picture is tested against the limit coming from experimental data: proton lifetime and neutrino oscillations.

scholarly journals Probing the unidentified Fermi blazar-like population using optical polarization and machine learning

2019 ◽  
Vol 486 (3) ◽  
pp. 3415-3422 ◽  
Author(s):  
I Liodakis ◽  
D Blinov
Keyword(s):  
Machine Learning ◽  
Predictive Power ◽  
High Energy ◽  
Point Sources ◽  
Low Energy ◽  
Optical Polarization ◽  
Sky Surveys ◽  
Γ Ray ◽  
Energy Processes ◽  
The Universe

ABSTRACT The Fermi γ-ray space telescope has revolutionized our view of the γ-ray sky and the high-energy processes in the Universe. While the number of known γ-ray emitters has increased by orders of magnitude since the launch of Fermi, there is an ever increasing number of, now more than a thousand, detected point sources whose low-energy counterpart is to this day unknown. To address this problem, we combined optical polarization measurements from the RoboPol survey as well as other discriminants of blazars from publicly available all-sky surveys in machine learning (ML, random forest and logistic regression) frameworks that could be used to identify blazars in the Fermi unidentified fields with an accuracy of >95 per cent. Out of the potential observational biases considered, blazar variability seems to have the most significant effect reducing the predictive power of the frameworks to ${\sim }80\hbox{-}85{{\ \rm per\ cent}}$. We apply our ML framework to six unidentified Fermi fields observed using the RoboPol polarimeter. We identified the same candidate source proposed by Mandarakas et al. for 3FGL J0221.2 + 2518.

scholarly journals CP violation, an experimental perspective

2005 ◽  
Vol 20 (14) ◽  
pp. 2975-2990 ◽  
Author(s):  
OWEN LONG
Keyword(s):  
Cp Violation ◽  
Electric Dipole ◽  
Dipole Moments ◽  
Low Energy ◽  
High Mass ◽  
Experimental Investigations ◽  
Matrix Elements ◽  
Electric Dipole Moments ◽  
Mixing Matrix ◽  
Near Future

I present a review of current and near-future experimental investigations of CP violation. In this review, I cover limits on particle electric dipole moments (EDMs) and CP violation studies in the K and B systems. The wealth of results from the new B factories provide impressive constraints on the CKM quark mixing matrix elements. Current and future measurements are focusing on processes dominated by loop diagrams, which probe physics at high mass scales in low-energy experiments.

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