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 Z2-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.
@article{arxiv.2505.23257,
title = {Dark clouds to silver linings over the hyperchargeless scalar triplets},
author = {Priyotosh Bandyopadhyay and Snehashis Parashar},
journal= {arXiv preprint arXiv:2505.23257},
year = {2025}
}