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Hui Luo1, Fabio Zwirner2

  • 1Dipartimento di Fisica ed Astronomia, Università di Padova, Via Marzolo 8, 35131 Padova, Italy and INFN, Sezione di Padova, Via Marzolo 8, 35131 Padova, Italy and SISSA, Via Bonomea 265, 34136 Trieste, Italy.

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This summary is machine-generated.

We present a simple N=1 supergravity model where supersymmetry and electroweak symmetry are spontaneously broken, leading to a new framework for understanding mass hierarchies and naturalness in particle physics.

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Area of Science:

  • Particle Physics
  • Supersymmetry
  • Cosmology

Background:

  • The Minimal Supersymmetric Standard Model (MSSM) requires a mechanism for supersymmetry breaking.
  • Understanding the origin of mass hierarchies is a key challenge in particle physics.

Purpose of the Study:

  • To introduce a novel N=1 supergravity model with a simple hidden sector.
  • To explore spontaneous symmetry breaking of both supersymmetry and electroweak gauge symmetry.
  • To investigate the implications for mass hierarchies and naturalness.

Main Methods:

  • Construction of a supersymmetric hidden sector coupled to the MSSM.
  • Analysis of classical vacuum properties, including symmetry breaking and vacuum energy.
  • Identification of massless scalars and mass spectra of other particles.

Main Results:

  • Spontaneous breaking of supersymmetry and SU(2)×U(1) electroweak symmetry at the classical level.
  • Vanishing vacuum energy with two real flat directions controlling symmetry-breaking scales.
  • Identification of a gauge singlet and the Higgs boson as massless scalars.
  • All other unobserved particles acquire masses of the order of m(3/2).

Conclusions:

  • The proposed model offers a simple starting point for reconciling naturalness with observed mass hierarchies.
  • This framework provides new avenues for studying the interplay between fundamental symmetries and particle masses.