### Abstract

In the standard model, the electroweak Z string can end on a Nambu monopole, whose mass is calculated to be 689 GeV from the current precise experimental data assuming the new particle with mass 125 GeV to be the Higgs boson. We study an extension of the standard model with additional singlet and triplet Higgs fields in the framework of N=1 supersymmetric field theory by using a D-brane configuration in type IIA string theory. We construct a D-brane configuration describing the electroweak symmetry breaking, and find a single D2-brane configuration describing a Z string and a Nambu monopole attached by a Z string in the standard model without an adjoint Higgs field. We further find a single D2-brane configuration describing a composite of a 't Hooft-Polyakov monopole and a Nambu monopole attached by a Z string in an extended standard model with an adjoint Higgs field. We compute the binding energy of the 't Hooft-Polyakov and Nambu monopoles by solving a minimal surface area of a D2-brane.

Original language | English |
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Article number | 045006 |

Journal | Physical Review D - Particles, Fields, Gravitation and Cosmology |

Volume | 87 |

Issue number | 4 |

DOIs | |

Publication status | Published - 2013 Feb 11 |

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### ASJC Scopus subject areas

- Nuclear and High Energy Physics

### Cite this

*Physical Review D - Particles, Fields, Gravitation and Cosmology*,

*87*(4), [045006]. https://doi.org/10.1103/PhysRevD.87.045006

**Brane realization of Nambu monopoles and electroweak strings.** / Eto, Minoru; Konishi, Kenichi; Nitta, Muneto; Ookouchi, Yutaka.

Research output: Contribution to journal › Article

*Physical Review D - Particles, Fields, Gravitation and Cosmology*, vol. 87, no. 4, 045006. https://doi.org/10.1103/PhysRevD.87.045006

}

TY - JOUR

T1 - Brane realization of Nambu monopoles and electroweak strings

AU - Eto, Minoru

AU - Konishi, Kenichi

AU - Nitta, Muneto

AU - Ookouchi, Yutaka

PY - 2013/2/11

Y1 - 2013/2/11

N2 - In the standard model, the electroweak Z string can end on a Nambu monopole, whose mass is calculated to be 689 GeV from the current precise experimental data assuming the new particle with mass 125 GeV to be the Higgs boson. We study an extension of the standard model with additional singlet and triplet Higgs fields in the framework of N=1 supersymmetric field theory by using a D-brane configuration in type IIA string theory. We construct a D-brane configuration describing the electroweak symmetry breaking, and find a single D2-brane configuration describing a Z string and a Nambu monopole attached by a Z string in the standard model without an adjoint Higgs field. We further find a single D2-brane configuration describing a composite of a 't Hooft-Polyakov monopole and a Nambu monopole attached by a Z string in an extended standard model with an adjoint Higgs field. We compute the binding energy of the 't Hooft-Polyakov and Nambu monopoles by solving a minimal surface area of a D2-brane.

AB - In the standard model, the electroweak Z string can end on a Nambu monopole, whose mass is calculated to be 689 GeV from the current precise experimental data assuming the new particle with mass 125 GeV to be the Higgs boson. We study an extension of the standard model with additional singlet and triplet Higgs fields in the framework of N=1 supersymmetric field theory by using a D-brane configuration in type IIA string theory. We construct a D-brane configuration describing the electroweak symmetry breaking, and find a single D2-brane configuration describing a Z string and a Nambu monopole attached by a Z string in the standard model without an adjoint Higgs field. We further find a single D2-brane configuration describing a composite of a 't Hooft-Polyakov monopole and a Nambu monopole attached by a Z string in an extended standard model with an adjoint Higgs field. We compute the binding energy of the 't Hooft-Polyakov and Nambu monopoles by solving a minimal surface area of a D2-brane.

UR - http://www.scopus.com/inward/record.url?scp=84874052286&partnerID=8YFLogxK

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U2 - 10.1103/PhysRevD.87.045006

DO - 10.1103/PhysRevD.87.045006

M3 - Article

AN - SCOPUS:84874052286

VL - 87

JO - Physical review D: Particles and fields

JF - Physical review D: Particles and fields

SN - 1550-7998

IS - 4

M1 - 045006

ER -