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The minimal anomaly-mediated supersymmetry-breaking model suggests wino-like or Higgsino-like neutralinos as cold dark matter (DM) candidates. Constraints from cosmology and experiments limit parameters, with poor prospects for muon anomaly or LHC discoveries but potential for direct DM detection.

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Area of Science:

  • Particle Physics
  • Cosmology
  • Astrophysics

Background:

  • Supersymmetry- মানি-mediated breaking (mAMSB) is a theoretical framework for physics beyond the Standard Model.
  • The nature of cold dark matter (DM) remains one of the most significant unsolved problems in cosmology.
  • Neutralinos are leading candidates for DM within supersymmetric theories.

Purpose of the Study:

  • To perform a likelihood analysis of the mAMSB model.
  • To investigate the viability of neutralino lightest supersymmetric particles (LSPs) as cold dark matter (DM) candidates.
  • To constrain model parameters using cosmological and experimental data.

Main Methods:

  • Likelihood analysis incorporating cosmological constraints (e.g., Planck) and accelerator experiment data.
  • Inclusion of Sommerfeld enhancement for DM annihilation cross-sections.
  • Analysis of Higgs mass measurements and constraints on supersymmetric particle masses.

Main Results:

  • Both wino-like and Higgsino-like neutralino LSPs are viable DM candidates with similar likelihoods.
  • Cosmological DM density limits constrain the mass of the neutralino LSP.
  • Higgs mass measurements favor specific parameter ranges, while scalar masses remain poorly constrained.
  • The anomalous magnetic moment of the muon and flavor measurements provide weak constraints on the mAMSB model.
  • Prospects for discovering supersymmetric particles at the LHC are limited, but direct DM detection has potential.

Conclusions:

  • The mAMSB model with neutralino LSPs is consistent with current cosmological and experimental data.
  • Specific parameter regions are favored, but uncertainties remain, particularly for scalar masses.
  • While direct LHC searches may have limited success, future direct DM detection experiments could probe the wino-like LSP scenario.
  • Interference effects could improve agreement with anomalous magnetic moment data in specific scenarios.