Mixed leptogenesis sources and low-energy neutrino portals
Abstract
A mixed leptogenesis source and its low-energy neutrino portal depend on the same heavy-particle amplitudes. We determine how this common origin restricts matching cancellations and the scalar population produced during reheating. For two Majorana mass levels, each containing a degenerate pair, the inclusive lepton-number-violating invariant fixes an allowed norm domain for the mixed dimension-five coefficient at specified threshold strengths. An aligned flavour texture makes the conventional source vanish as a matrix and gives equal coupling norms for the two massive neutrinos. A continuous family preserves the neutrino-mass fit while relating the source to unequal light coupling strengths. The matched couplings give benchmark vacuum lifetimes of 1.62×1012 s and 2.80×1011 s, while reheating normalized to the baryon abundance determines the primary spectrum. In the massless Born approximation with dilute outgoing states, bath-produced scalars carry 4.81×10−5 of the primary scalar energy but contribute $11.1$ times its variance. The positive production functional converts the matching constraint into a conditional variance bound. We derive the scalar-mass dependence of stimulated emission and the Hartree moment equation, keeping the scalar mass and quartic as renormalized matching inputs. These results link the leptogenesis source to light-neutrino decay and the finite-density quantities entering subsequent coupled transport.
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BibTeX
@misc{xu2026mixed,
title = {{Mixed leptogenesis sources and low-energy neutrino portals}},
author = {Yingnan Xu},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.14708},
eprint = {2610.14708},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.14708},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Mixed leptogenesis sources and low-energy neutrino portals
AU - Yingnan Xu
PY - 2026
DA - 2026/10/10
PB - arXiv
DO - 10.48550/arxiv.2610.14708
UR - https://arxiv.org/abs/2610.14708
AB - A mixed leptogenesis source and its low-energy neutrino portal depend on the same heavy-particle amplitudes. We determine how this common origin restricts matching cancellations and the scalar population produced during reheating. For two Majorana mass levels, each containing a degenerate pair, the inclusive lepton-number-violating invariant fixes an allowed norm domain for the mixed dimension-five coefficient at specified threshold strengths. An aligned flavour texture makes the conventional source vanish as a matrix and gives equal coupling norms for the two massive neutrinos. A continuous family preserves the neutrino-mass fit while relating the source to unequal light coupling strengths. The matched couplings give benchmark vacuum lifetimes of 1.62×10^12 s and 2.80×10^11 s, while reheating normalized to the baryon abundance determines the primary spectrum. In the massless Born approximation with dilute outgoing states, bath-produced scalars carry 4.81×10^−5 of the primary scalar energy but contribute $11.1$ times its variance. The positive production functional converts the matching constraint into a conditional variance bound. We derive the scalar-mass dependence of stimulated emission and the Hartree moment equation, keeping the scalar mass and quartic as renormalized matching inputs. These results link the leptogenesis source to light-neutrino decay and the finite-density quantities entering subsequent coupled transport.
ER -