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Brane realization of Nambu monopoles and electroweak strings

Minoru Eto1, Kenichi Konishi2,3, Muneto Nitta4, and Yutaka Ookouchi5

  • 1Department of Physics, Yamagata University, Yamagata 990-8560, Japan
  • 2Department of Physics, “E. Fermi,” University of Pisa, Largo Pontecorvo, 3, Pisa 56127, Italy
  • 3INFN, Sezione di Pisa, Largo Pontecorvo, 3, Pisa 56127, Italy
  • 4Department of Physics, and Research and Education Center for Natural Sciences, Keio University, Hiyoshi 4-1-1, Yokohama, Kanagawa 223-8521, Japan
  • 5The Hakubi Center for Advanced Research and Department of Physics, Kyoto University, Kyoto 606-8502, Japan

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Phys. Rev. D 87, 045006 – Published 11 February, 2013

DOI: https://doi.org/10.1103/PhysRevD.87.045006

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.

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Phys. Rev. D 87, 045006– Published 11 February, 2013
  • Received 27 November 2012

© 2013 American Physical Society

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