Abstract
Contrary to the standard model that does not admit topologically nontrivial solitons, two Higgs doublet models admit topologically stable vortex strings and domain walls. We numerically confirm the existence of a topological Z-string confining fractional Z-flux inside. We show that topological strings at sin θW = 0 limit reduce to non-Abelian strings which possess non-Abelian moduli S2 associated with spontaneous breakdown of the SU(2) custodial symmetry. We numerically solve the equations of motion for various parameter choices. It is found that a gauging U(1)Y always lowers the tension of the Z-string while it keeps that of the W-string. On the other hand, a deformation of the Higgs potential is either raising or lowering the tensions of the Z-string and W-string. We numerically obtain an effective potential for the non-Abelian moduli S2 for various parameter deformations under the restriction tan β = 1. It is the first time to show that there exists a certain parameter region where the topological W-string can be the most stable topological excitation, contrary to conventional wisdom of electroweak theories. We also obtain numerical solutions of composites of the string and domain walls in a certain condition.
| Original language | English |
|---|---|
| Article number | 195 |
| Journal | Journal of High Energy Physics |
| Volume | 2018 |
| Issue number | 8 |
| DOIs | |
| Publication status | Published - 2018 Aug 1 |
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Keywords
- Beyond Standard Model
- Solitons Monopoles and Instantons
ASJC Scopus subject areas
- Nuclear and High Energy Physics
Cite this
Non-Abelian strings and domain walls in two Higgs doublet models. / Eto, Minoru; Kurachi, Masafumi; Nitta, Muneto.
In: Journal of High Energy Physics, Vol. 2018, No. 8, 195, 01.08.2018.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Non-Abelian strings and domain walls in two Higgs doublet models
AU - Eto, Minoru
AU - Kurachi, Masafumi
AU - Nitta, Muneto
PY - 2018/8/1
Y1 - 2018/8/1
N2 - Contrary to the standard model that does not admit topologically nontrivial solitons, two Higgs doublet models admit topologically stable vortex strings and domain walls. We numerically confirm the existence of a topological Z-string confining fractional Z-flux inside. We show that topological strings at sin θW = 0 limit reduce to non-Abelian strings which possess non-Abelian moduli S2 associated with spontaneous breakdown of the SU(2) custodial symmetry. We numerically solve the equations of motion for various parameter choices. It is found that a gauging U(1)Y always lowers the tension of the Z-string while it keeps that of the W-string. On the other hand, a deformation of the Higgs potential is either raising or lowering the tensions of the Z-string and W-string. We numerically obtain an effective potential for the non-Abelian moduli S2 for various parameter deformations under the restriction tan β = 1. It is the first time to show that there exists a certain parameter region where the topological W-string can be the most stable topological excitation, contrary to conventional wisdom of electroweak theories. We also obtain numerical solutions of composites of the string and domain walls in a certain condition.
AB - Contrary to the standard model that does not admit topologically nontrivial solitons, two Higgs doublet models admit topologically stable vortex strings and domain walls. We numerically confirm the existence of a topological Z-string confining fractional Z-flux inside. We show that topological strings at sin θW = 0 limit reduce to non-Abelian strings which possess non-Abelian moduli S2 associated with spontaneous breakdown of the SU(2) custodial symmetry. We numerically solve the equations of motion for various parameter choices. It is found that a gauging U(1)Y always lowers the tension of the Z-string while it keeps that of the W-string. On the other hand, a deformation of the Higgs potential is either raising or lowering the tensions of the Z-string and W-string. We numerically obtain an effective potential for the non-Abelian moduli S2 for various parameter deformations under the restriction tan β = 1. It is the first time to show that there exists a certain parameter region where the topological W-string can be the most stable topological excitation, contrary to conventional wisdom of electroweak theories. We also obtain numerical solutions of composites of the string and domain walls in a certain condition.
KW - Beyond Standard Model
KW - Solitons Monopoles and Instantons
UR - http://www.scopus.com/inward/record.url?scp=85052696324&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85052696324&partnerID=8YFLogxK
U2 - 10.1007/JHEP08(2018)195
DO - 10.1007/JHEP08(2018)195
M3 - Article
AN - SCOPUS:85052696324
VL - 2018
JO - Journal of High Energy Physics
JF - Journal of High Energy Physics
SN - 1126-6708
IS - 8
M1 - 195
ER -