Kavli Affiliate: Jia Liu
| First 5 Authors: Qi Bi, Qi Bi, , ,
| Summary:
We propose a UV-complete extension of the Standard Model in which a
gauge-singlet scalar $S$ acquires a vacuum expectation value, generates a
Majorana mass for a sterile neutrino $N$, and mixes with the Higgs field. This
framework addresses neutrino masses via a seesaw mechanism and, for
sufficiently large scalar mixing, can also drive a strong first-order
electroweak phase transition, producing gravitational-wave (GW) signals
potentially detectable by GW observatories. The Higgs-$S$ mixing also enhances
sterile-neutrino pair production at colliders through $s$-channel exchange of
the Higgs and $S$. Owing to the small active-sterile mixing angle, $N$ is
generically long-lived, yielding characteristic displaced-vertex signatures.
The combination of GW observations and displaced-vertex searches at colliders
provides complementary cross-checks of the model parameter space.
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