Leptogenesis as the Origin of Matter

Buchmüller, W.; Peccei, R.D.; Yanagida, Tsutomu T.

doi:10.1146/annurev.nucl.55.090704.151558

Cited by 688 publications

(609 citation statements)

References 137 publications

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“…In the factor d = 3α sph /(4f ) ≈ 0.96 × 10 −2 , f = 2387/86 accounts for the dilution due to photon production from the onset of leptogenesis till recombination and the factor α sph = 28/79 accounts for the partial conversion of the lepton asymmetry into a baryon asymmetry by sphaleron processes. Since all this is assumed to happen in the thermal, radiation dominated phase of the universe, the lower bound on M 1 translates into a lower bound on the initial temperature of leptogenesis, which corresponds to a lower limit on the reheating temperature after inflation [18],…”

Section: Thermal Leptogenesismentioning

confidence: 99%

Effects of reheating on leptogenesis

Hahn-Woernle

Plümacher

2009

Nuclear Physics B

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We study the evolution of a cosmological baryon asymmetry in leptogenesis when the right-handed neutrinos are produced in inflaton decays. By performing a detailed numerical study over a broad range of inflaton-neutrino couplings we show that the resulting asymmetry can be larger by two orders of magnitude or more than in thermal leptogenesis, if the reheating temperature T RH is of the same order as the right-handed neutrino mass M 1 . Hence, the lower limit on the baryogenesis temperature obtained in thermal leptogenesis can be relaxed accordingly.

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Section: Thermal Leptogenesismentioning

confidence: 99%

Effects of reheating on leptogenesis

Hahn-Woernle

Plümacher

2009

Nuclear Physics B

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“…With the procedure described above, we find 11) and hence a clear preference for the strong wash-out regime [26]. Notice that there typically is a hierarchy between m 1 and m 1 of about one order of magnitude.…”

Section: Mass Hierarchymentioning

confidence: 79%

“…Finally, leptogenesis [25] links the low energy neutrino physics to the high energy physics of the early universe. The parameters that capture this connection are the effective neutrino mass of the first generation m 1 and the CP violation parameter ε 1 (for reviews containing the relevant formulae see, for example, [26]),…”

Section: Mass Hierarchymentioning

confidence: 99%

Predicting θ 13 and the neutrino mass scale from quark lepton mass hierarchies

Buchmüller

Domcke

Schmitz

2012

J. High Energ. Phys.

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Flavour symmetries of Froggatt-Nielsen type can naturally reconcile the large quark and charged lepton mass hierarchies and the small quark mixing angles with the observed small neutrino mass hierarchies and their large mixing angles. We point out that such a flavour structure, together with the measured neutrino mass squared differences and mixing angles, strongly constrains yet undetermined parameters of the neutrino sector. Treating unknown O(1) parameters as random variables, we obtain surprisingly accurate predictions for the smallest mixing angle, sin 2 2θ 13 = 0.07 +0.11 −0.05 , the smallest neutrino mass, m 1 = 2.2 +1.7 −1.4 × 10 −3 eV, and one Majorana phase, α 21 /π = 1.0 +0.2 −0.2 .

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“…The lepton number asymmetries generated in heavy neutrino decays will not be completely destroyed by the lepton-number-violating inverse decays and scattering processes. In this case, the final baryon number asymmetry can be approximately computed by [74,75] …”

Section: Nearly Degenerate Massesmentioning

confidence: 99%

Broken S _3L × S _3R flavor symmetry and leptonic CP violation

Yang

Zhou

2017

Chinese Phys. C

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In the framework of the canonical seesaw model, we present a simple but viable scenario to explicitly break an S 3L ×S 3R flavor symmetry in the leptonic sector. It turns out that the leptonic flavor mixing matrix is completely determined by the mass ratios of the charged leptons (i.e., m e /m µ and m µ /m τ ) and those of light neutrinos (i.e., m 1 /m 2 and m 2 /m 3 ). The latest global-fit results of the three neutrino mixing angles {θ 12 ,θ 13 ,θ 23 } and two neutrino mass-squared differences {∆m 2 21 ,∆m 2 31 } at the 3σ level are used to constrain the parameter space of {m 1 /m 2 ,m 2 /m 3 }. The predictions for the mass spectrum and flavor mixing are highlighted: (1) the neutrino mass spectrum shows a hierarchical pattern and a normal ordering, e.g., m 1 ≈2.2 meV, m 2 ≈8.8 meV and m 3 ≈52.7 meV; (2) only the first octant of θ 23 is allowed, namely, 41.8 • θ 23 43.3 • ; (3) the Dirac CP -violating phase δ ≈ −22 • deviates significantly from the maximal value −90 • . All these predictions are ready to be tested in ongoing and forthcoming neutrino oscillation experiments. Moreover, we demonstrate that the cosmological matter-antimatter asymmetry can be explained via resonant leptogenesis, including the individual lepton-flavor effects. In our scenario, leptonic CP violation at low-and high-energy scales is closely connected.

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Leptogenesis as the Origin of Matter

Cited by 688 publications

References 137 publications

Effects of reheating on leptogenesis

Effects of reheating on leptogenesis

Predicting θ 13 and the neutrino mass scale from quark lepton mass hierarchies

Broken S _3L × S _3R flavor symmetry and leptonic CP violation

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Leptogenesis as the Origin of Matter

Cited by 688 publications

References 137 publications

Effects of reheating on leptogenesis

Effects of reheating on leptogenesis

Predicting θ 13 and the neutrino mass scale from quark lepton mass hierarchies

Broken S 3L × S 3R flavor symmetry and leptonic CP violation

Contact Info

Product

Resources

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Broken S _3L × S _3R flavor symmetry and leptonic CP violation