TY - JOUR
T1 - Baryogenesis from mixing of lepton doublets
AU - Garbrecht, Björn
N1 - Funding Information:
The author acknowledges support by the Gottfried Wilhelm Leibniz programme of the Deutsche Forschungsgemeinschaft and by the DFG cluster of excellence ‘Origin and Structure of the Universe’ ( http://www.universe-cluster.de ).
PY - 2013/3/21
Y1 - 2013/3/21
N2 - It is shown that the mixing of lepton doublets of the Standard Model can yield sizable contributions to the lepton asymmetry, that is generated through the decays of right-handed neutrinos at finite temperature in the early Universe. When calculating the flavour-mixing correlations, we account for the effects of Yukawa as well as of gauge interactions. We compare the freeze-out asymmetry from lepton-doublet mixing to the standard contributions from the mixing and direct decays of right-handed neutrinos. The asymmetry from lepton mixing is considerably large when the mass ratio between the right-handed neutrinos is of order of a few, while it becomes Maxwell-suppressed for larger hierarchies. For an intermediate range between the case of degenerate right-handed neutrinos (resonant leptogenesis) and the hierarchical case, lepton mixing can yield the main contribution to the lepton asymmetry.
AB - It is shown that the mixing of lepton doublets of the Standard Model can yield sizable contributions to the lepton asymmetry, that is generated through the decays of right-handed neutrinos at finite temperature in the early Universe. When calculating the flavour-mixing correlations, we account for the effects of Yukawa as well as of gauge interactions. We compare the freeze-out asymmetry from lepton-doublet mixing to the standard contributions from the mixing and direct decays of right-handed neutrinos. The asymmetry from lepton mixing is considerably large when the mass ratio between the right-handed neutrinos is of order of a few, while it becomes Maxwell-suppressed for larger hierarchies. For an intermediate range between the case of degenerate right-handed neutrinos (resonant leptogenesis) and the hierarchical case, lepton mixing can yield the main contribution to the lepton asymmetry.
UR - http://www.scopus.com/inward/record.url?scp=84871358492&partnerID=8YFLogxK
U2 - 10.1016/j.nuclphysb.2012.11.021
DO - 10.1016/j.nuclphysb.2012.11.021
M3 - Article
AN - SCOPUS:84871358492
SN - 0550-3213
VL - 868
SP - 557
EP - 576
JO - Nuclear Physics, Section B
JF - Nuclear Physics, Section B
IS - 3
ER -