Leptogenesis for pedestrians
By W. Buchmuller, P. Bari, M. Plümacher. 2004
927 citations recorded by the source corpus.
Abstract During the process of thermal leptogenesis temperature decreases by about one order of magnitude while the baryon asymmetry is generated. We present an analytical description of this process so that the dependence on the neutrino mass parameters becomes transparent. In the case of maximal CP asymmetry all decay and scattering rates in the plasma are determined by the mass M1 of the decaying heavy Majorana neutrino, the effective light neutrino mass m ∼ 1 and the absolute mass scale m ¯ of the light neutrinos. In the mass range suggested by neutrino oscillations, m sol ≃ 8 × 10 - 3 eV ≲ m ∼ 1 ≲ m atm ≃ 5 × 10 - 2 eV , leptogenesis is dominated just by decays and inverse decays. The effect of all other scattering processes lies within the theoretical uncertainty of present calculations. The final baryon asymmetry is dominantly produced at a temperature TB which can be about one order of magnitude below the heavy neutrino mass M1. We also derive an analytical expression for the upper bound on the light neutrino masses implied by successful leptogenesis.
Subfields: Nuclear and High Energy Physics
View Paper: https://www.semanticscholar.org/paper/efc856ba539e45b6644e9b0300204c78c25b8661
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Citations in the corpus
- Baryogenesis from the weak scale to the grand unification scale (2020, background): “The heavy neutrinos decay at z > 1, such that scattering processes are unimportant, and for small neutrino masses ∆L = 2 washout processes are suppressed (Buchmuller, Di Bari, and Plumacher, 2005a).”
- Charged Lepton Flavour Violation: An Experimental and Theoretical Introduction (2017, background): “(33) naively gives MR ∼ 1014 ÷ 1015 GeV for Yν ∼ O (1).”
- Leptogenesis (2008, neutral): “Previous (unflavoured) reviews include [42, 49, 50] and [51, 52].”
- The Phenomenology of Right Handed Neutrinos (2013, background): “However, vanilla leptogenesis can be qualitatively understood by considering the decays and inverse decays only [390].”
- Flaxion: a minimal extension to solve puzzles in the standard model (2016, background): “The final baryon asymmetry through the leptogenesis from the decay of right-handed neutrinos is given by [76]”
- Flavor structures of charged fermions and massive neutrinos (2019, background): “Of course, an exact description of the lepton-antilepton asymmetry resorts to solving a full set of Boltzmann equations for the time evolution of relevant particle number densities [212, 214, 216, 218, 230, 231, 232].”
- A facility to search for hidden particles at the CERN SPS: the SHiP physics case (2015, methodology): “[643, 653]), type II [370, 654, 655], and type III [656, 657] seesaws, mostly using Boltzmann Equations as pioneered by [658].”
- Standard Model—axion—seesaw—Higgs portal inflation. Five problems of particle physics and cosmology solved in one stroke (2016, background): “one finds that the observed baryon asymmetry is generated as long as [145,186,187]”
- A White Paper on keV sterile neutrino Dark Matter (2016, result): “1) eV [394, 398, 399, 436] an upper bound that now cosmological observations, in particular the new results from the Planck satellite, indicate to be respected.”