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arXiv · 2606.15316

Particle and Gravitational Wave Probes of Minimal Seesaw Neutrinos

Sanjoy Mandal·Rishav Roshan·Jose W. F. Valle
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Abstract

Observable gravitational waves (GWs) from first-order phase transitions (FOPTs) can coexist with distinct particle physics signatures. These include same-sign dilepton plus four~jet events at colliders, such as $e^+ e^-/\mu^+\mu^- \to \ell^\pm \ell^\pm 4j$, neutrinoless double beta decay, as well as charged lepton flavor violating (cLFV) processes such as $\mu \to e \gamma$. We explore this synergy within the minimal low-scale linear seesaw model. This framework successfully reproduces neutrino oscillation data, providing a direct avenue to probe the neutrino mass ordering and Majorana nature at colliders. Crucially, the FOPT responsible for the GW background is driven by a leptophilic Higgs doublet, establishing a direct link between early-universe cosmology and terrestrial laboratory experiments.

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Sanjoy Mandal, Rishav Roshan, Jose W. F. Valle. 2026-06-13. Particle and Gravitational Wave Probes of Minimal Seesaw Neutrinos. https://arxiv.org/abs/2606.15316

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