A Lower bound on the right-handed neutrino mass from leptogenesis

By S. Davidson, A. Ibarra. 2002

825 citations recorded by the source corpus.

Abstract In the see-saw model, the baryon asymmetry of the Universe can be generated by the decay of the lightest right-handed neutrino, νR. For a hierarchical spectrum of right-handed neutrinos, we show that there is a model independent upper bound on the CP asymmetry produced in these decays: ϵ m ν 3 = Δm 2 atm and the νR are produced thermally, then leptogenesis requires a reheat temperature of the Universe Treh>MνR>108 GeV. Reasonable estimates of νR production and the subsequent washout of the asymmetry, as made by Buchmuller and Plumacher, imply MνR>109 GeV, and Treh>1010 GeV. Implications for the gravitino problem are also discussed.

Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/65349dbf797d5d879f17b368aca50cd5d0e642d1

How researchers see this paper

The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.

In Astronomy and Astrophysics

1. J. Redondo
2. Alessandro Strumia
3. A. Ringwald
4. E. Nardi
5. G. Giudice
6. A. Riotto
7. M. Drewes
8. W. Buchmuller

In Nuclear and High Energy Physics

1. E. Nardi
2. J. Redondo
3. Alessandro Strumia
4. A. Riotto
5. M. Drewes
6. D. Bodeker
7. W. Buchmuller
8. A. Ringwald

Citations in the corpus

• The Phenomenology of Right Handed Neutrinos (2013, background): “The good agreement between BBN calculations and the observed H and He abundances implies that, if sterile neutrinos with GeV.”
• The landscape of QCD axion models (2020, background): “The serious drawbacks of these two theories are that supersymmetry has not been found at the LHC, while the experimental verification of type-I seesaw leptogenesis remains well outside the reach of all current experiments [11–15].”
• Flavour matters in leptogenesis (2006, background): “J H E P 0 9 ( 2 0 0 6 ) 0 1 0 for the non-degenerate case) and we define 2max = 3∆matmM1/(8πv mmax) [18], then the flavour dependent CP asymmetries are bounded by”
• Hierarchical neutrino mass matrices, CP violation and leptogenesis (2003, neutral): “In the context of thermal leptogenesis, when the observed baryon asymmetry is generated through the decays of the lightest heavy Majorana neutrino N1, in order to produce the right baryon asymmetry, YB, there exists an upper bound on the lightest M1, typically M1 & 10 8GeV [5].”
• Leptogenesis (2008, positive): “(17)Notice that [74] used ǫ for the MSSM, which is twice as big, see eqn (5.”
• Flaxion: a minimal extension to solve puzzles in the standard model (2016, background): “where δeff is the effective CP angle which satisfies δeff ≤ 1 for mN1 mN2(3) [77, 78].”
• Leptogenesis in the Universe (2012, methodology): “i R2 1i = 1, we then obtain the Davidson-Ibarra (DI) bound [61]”
• Standard Model—axion—seesaw—Higgs portal inflation. Five problems of particle physics and cosmology solved in one stroke (2016, background): “The latter bound comes from examining the sources of CP violation in the RH neutrino decays and assuming a hierarchical RH neutrino spectrum; in this case, fixing the light neutrino masses, the sources can be seen proportional to M1, and requiring a sufficient asymmetry leads to the lower bound on M”