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  • Letter
  • Open Access

All axion dark matter from supersymmetric models

Howard Baer1,*, Vernon Barger2,†, Dibyashree Sengupta3,4,‡, and Kairui Zhang1,§

  • *Contact author: baer@ou.edu
  • †Contact author: barger@pheno.wisc.edu
  • ‡Contact author: Dibyashree.Sengupta@roma1.infn.it
  • §Contact author: kzhang25@ou.edu

Phys. Rev. D 111, L111702 – Published 25 June, 2025

DOI: https://doi.org/10.1103/1n3m-g69m

Abstract

Supersymmetric models accompanied by certain anomaly-free discrete R symmetries ZnR are attractive in that 1. the R symmetry (which can arise from compactified string theory as a remnant of the broken 10-d Lorentz symmetry) forbids unwanted superpotential terms while allowing for the generation of an accidental, approximate global U(1)PQ symmetry needed to solve the strong CP problem and 2. they provide a raison d’etre for an otherwise ad-hoc R-parity conservation. We augment the minimal supersymmetric Standard Model (MSSM) by two additional ZnR- and Peccei-Quinn (PQ)-charged fields X and Y wherein supersymmetry (SUSY) breaking at an intermediate scale mhidden leads to PQ breaking at a scale fa∼1011  GeV leading to a SUSY Dine-Fischler-Srednicki-Zhitnitsky (DFSZ) axion. The same SUSY breaking can trigger R-parity breaking via higher-dimensional operators leading to tiny R-violating couplings of order (fa/mP)N so that both U(1)PQ and R parity emerge as accidental, approximate symmetries. For Z4R and Z8R, we find only an N=1 suppression. Then the lightest SUSY particle (LSP) of the MSSM becomes unstable with a lifetime of order 10−3−101 s so the LSPs all decay away before the present epoch. That leaves a universe with all axion cold dark matter and no weakly interacting massive particles (WIMPs) in accord with recent LZ(2024) WIMP search results.

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