A Compromise between Neutrino Masses and Collider Signatures in the Type-II Seesaw Model
| dc.creator | Chao, Wei | |
| dc.creator | Luo, Shu | |
| dc.creator | Xing, Zhi-zhong | |
| dc.creator | Zhou, Shun | |
| dc.date | 2007-09-07 | |
| dc.date.accessioned | 2026-07-07T11:19:11Z | |
| dc.date.available | 2026-07-07T11:19:11Z | |
| dc.description | A natural extension of the standard $SU(2)_{\rm L} \times U(1)_{\rm Y}$ gauge model to accommodate massive neutrinos is to introduce one Higgs triplet and three right-handed Majorana neutrinos, leading to a $6\times 6$ neutrino mass matrix which contains three $3\times 3$ sub-matrices $M_{\rm L}$, $M_{\rm D}$ and $M_{\rm R}$. We show that three light Majorana neutrinos (i.e., the mass eigenstates of $ν_e$, $ν_μ$ and $ν_τ$) are exactly massless in this model, if and only if $M_{\rm L} = M_{\rm D} M_{\rm R}^{-1} M_{\rm D}^T$ exactly holds. This no-go theorem implies that small but non-vanishing neutrino masses may result from a significant but incomplete cancellation between $M_{\rm L}$ and $M_{\rm D} M_{\rm R}^{-1} M_{\rm D}^T$ terms in the Type-II seesaw formula, provided three right-handed Majorana neutrinos are of ${\cal O}(1)$ TeV and experimentally detectable at the LHC. We propose three simple Type-II seesaw scenarios with the $A_4 \times U(1)_{\rm X}$ flavor symmetry to interpret the observed neutrino mass spectrum and neutrino mixing pattern. Such a TeV-scale neutrino model can be tested in two complementary ways: (1) searching for possible collider signatures of lepton number violation induced by the right-handed Majorana neutrinos and doubly-charged Higgs particles; and (2) searching for possible consequences of unitarity violation of the $3\times 3$ neutrino mixing matrix in the future long-baseline neutrino oscillation experiments. | |
| dc.description | RevTeX 19 pages, no figures | |
| dc.identifier | https://arxiv.org/abs/0709.1069 | |
| dc.identifier | http://arxiv.org/abs/0709.1069 | |
| dc.identifier | Phys.Rev.D77:016001,2008 | |
| dc.identifier | doi:10.1103/PhysRevD.77.016001 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/193600 | |
| dc.subject | High Energy Physics - Phenomenology | |
| dc.subject | High Energy Physics - Experiment | |
| dc.title | A Compromise between Neutrino Masses and Collider Signatures in the Type-II Seesaw Model | |
| dc.type | text |