Leptogenesis in a model of Dark Energy and Dark Matter
| dc.creator | Hung, P. Q. | |
| dc.date | 2006-04-06 | |
| dc.date | 2008-03-27 | |
| dc.date.accessioned | 2026-07-07T09:28:40Z | |
| dc.date.available | 2026-07-07T09:28:40Z | |
| dc.description | A recent model of dark energy and dark matter was proposed, involving a new gauge group $SU(2)_Z$ whose coupling grows strong at a scale $Λ_Z \sim 10^{-3} eV$, a result which is obtained from a simple assumption that its initial value at some high energy scale $M \sim 10^{16} GeV$ is of the order of a typical Standard Model (SM) coupling at a similar scale. (This assumption comes naturally from an embedding of $SU(2)_Z$ and the SM into a grand unified group $E_6$.) It is found that the proposed model contains a SM lepton-number violating Yukawa coupling involving a scalar ``messenger field'' ${\tilde{\bmϕ}}^{(Z)}$ (which carries both $SU(2)_Z$ and electroweak quantum numbers), a $SU(2)_Z$ fermion $ψ^{(Z)}$ and a SM lepton $l$. The interference between the tree-level and one-loop decay amplitude for ${\tilde{\bmϕ}}^{(Z)} \to ψ^{(Z)} + l$ generates a SM lepton asymmetry which is subsequently converted into a baryon asymmetry through electroweak sphaleron processes. This constrains the mass of the messenger field to be less than $1 TeV$, making it accessible to searches at future colliders: the ``progenitor'' of a net lepton number (and hence a net baryon number) could possibly be found and identified experimentally. | |
| dc.description | 12 double-column pages, 3 figures. Updated results | |
| dc.identifier | https://arxiv.org/abs/hep-ph/0604063 | |
| dc.identifier | http://arxiv.org/abs/hep-ph/0604063 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/157508 | |
| dc.subject | High Energy Physics - Phenomenology | |
| dc.subject | Astrophysics | |
| dc.title | Leptogenesis in a model of Dark Energy and Dark Matter | |
| dc.type | text |