Revisiting CMSSM with Non-Universal Gaugino Masses under Current Constraints

TL;DR

This paper explores non-universal gaugino masses within an SU(5) GUT framework to reconcile the CMSSM with current experimental constraints, analyzing Higgs data, muon g-2, dark matter detection, and collider prospects.

Contribution

It introduces the $ ilde{g}$-SUGRA scenario with a heavy gluino to evade experimental bounds and assesses its viability under Higgs and muon g-2 constraints, providing testable predictions for future experiments.

Findings

Heavy gluino scenario can evade current bounds.

Higgs measurements restrict model parameters.

Future colliders can probe remaining parameter space.

Abstract

To address the longstanding tension between the Constrained Minimal Supersymmetric Standard Model (CMSSM) and recent experimental data, we investigate non-universal gaugino masses within an SU(5) Grand Unified Theory (GUT) framework, focusing on the $\tilde{g}$-SUGRA scenario where $\lvert M_{3} \rvert \gg \lvert M_{1} \rvert, \lvert M_{2} \rvert$. This hierarchy enables a heavier gluino, thereby evading current experimental bounds on supersymmetric particles. Our analysis reveals that precise Higgs measurements place stringent constraints on the model, requiring $\tan\beta \gtrsim 5$ and $ M_{0} \gtrsim 20 \, \tan\beta \,\text{GeV}$. Although the $\tilde{g}$-SUGRA scenario can help reconcile the persistent $(g-2)_\mu$ anomaly, the Higgs constraints significantly restrict its parameter space, making a large contribution to $(g-2)_{\mu}$ challenging. We also assess the discovery prospects in upcoming dark matter direct detection experiments, including PandaX-xT (200 t.y.), LZ (projected), and XENONnT (20 t.y.), which may not fully cover the viable parameter space. In contrast, future collider experiments$-$such as the High-Luminosity LHC at $3\,\mathrm{ab}^{-1}$ and $\mathrm{CLIC}_{1500}$ at $2.5\,\mathrm{ab}^{-1}$$-$can comprehensively probe the remaining regions. These findings highlight $\tilde{g}$-SUGRA as a promising solution to the CMSSM tension and offer clear, testable predictions for upcoming collider searches.