Dark clouds to silver linings over the hyperchargeless scalar triplets

Priyotosh Bandyopadhyay; Snehashis Parashar

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arXiv · 2505.23257

Dark clouds to silver linings over the hyperchargeless scalar triplets

Priyotosh Bandyopadhyay·Snehashis Parashar

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Abstract

A real scalar triplet with zero hypercharge offers a minimal non-trivial extension of the Standard Model (SM) with a charged Higgs and a possible dark matter or custodial symmetry breaking signature. The $Z_2$-odd inert triplet model (ITM) provides a dark matter, while the non-inert Higgs triplet model (HTM) breaks the custodial symmetry, enabling rich collider signatures. Both these models also promise the viability of a first-order phase transition (FOPT). This letter revisits both models under various theoretical and current experimental constraints, revealing a trade-off between DM and FOPT viability, and explores the resulting gravitational wave signals and collider prospects.

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Priyotosh Bandyopadhyay, Snehashis Parashar. 2025-05-29. Dark clouds to silver linings over the hyperchargeless scalar triplets. https://arxiv.org/abs/2505.23257

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