Why is the $3\times 3$ neutrino mixing matrix almost unitary in realistic seesaw models?
| dc.creator | Xing, Zhi-zhong | |
| dc.creator | Zhou, Shun | |
| dc.date | 2005-12-22 | |
| dc.date.accessioned | 2026-07-07T06:54:20Z | |
| dc.date.available | 2026-07-07T06:54:20Z | |
| dc.description | A simple extension of the standard model is to introduce $n$ heavy right-handed Majorana neutrinos and preserve its $\rm SU(2)^{}_L \times U(1)^{}_Y$ gauge symmetry. Diagonalizing the $(3+n) \times (3+n)$ neutrino mass matrix, we obtain an exact analytical expression for the effective mass matrix of $ν^{}_e$, $ν^{}_μ$ and $ν^{}_τ$. It turns out that the $3\times 3$ neutrino mixing matrix $V$, which appears in the leptonic charged-current weak interactions, must not be exactly unitary. The unitarity violation of $V$ is negligibly tiny, however, if the canonical seesaw mechanism works to reproduce the correct mass scale of light Majorana neutrinos. A similar conclusion can be drawn in the realistic Type-II seesaw models. | |
| dc.description | RevTex 8 pages, no figures | |
| dc.identifier | https://arxiv.org/abs/hep-ph/0512290 | |
| dc.identifier | http://arxiv.org/abs/hep-ph/0512290 | |
| dc.identifier | High Energy Phys.Nucl.Phys. 30 (2006) 828-832 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/105898 | |
| dc.subject | High Energy Physics - Phenomenology | |
| dc.title | Why is the $3\times 3$ neutrino mixing matrix almost unitary in realistic seesaw models? | |
| dc.type | text |