Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2003-02-12
Nucl.Phys. B665 (2003) 445-468
Physics
High Energy Physics
High Energy Physics - Phenomenology
29 pages, 12 figures included
Scientific paper
10.1016/S0550-3213(03)00449-8
Interactions of heavy Majorana neutrinos in the thermal phase of the early universe may be the origin of the cosmological matter-antimatter asymmetry. This mechanism of baryogenesis implies stringent constraints on light and heavy Majorana neutrino masses. We derive an improved upper bound on the CP asymmetry in heavy neutrino decays which, together with the kinetic equations, yields an upper bound on all light neutrino masses of 0.1 eV. Lepton number changing processes at temperatures above the temperature T_B of baryogenesis can erase other, pre-existing contributions to the baryon asymmetry. We find that these washout processes become very efficient if the effective neutrino mass \tilde{m}_1 is larger than m_* \simeq 10^{-3} eV. All memory of the initial conditions is then erased. Hence, for neutrino masses in the range from (\Delta m^2_sol)^{1/2} \simeq 8*10^{-3} eV to (\Delta m^2_atm)^{1/2} \simeq 5*10^{-2} eV, which is suggested by neutrino oscillations, leptogenesis emerges as the unique source of the cosmological matter-antimatter asymmetry.
Bari Pasquale Di
Buchmüller Wilfried
Plumacher Michael
No associations
LandOfFree
The Neutrino Mass Window for Baryogenesis does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with The Neutrino Mass Window for Baryogenesis, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The Neutrino Mass Window for Baryogenesis will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-439271