Leptonic scalars and collider signatures in a UV-complete model

Dev, P. S. Bhupal; Dutta, Bhaskar; Ghosh, Tathagata; Han, Tao; Qin, Han

doi:10.1007/jhep03(2022)068

Cited by 15 publications

(14 citation statements)

References 109 publications

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“…• With couplings exclusively or predominantly to some specific SM flavors, such as the hadronic and leptonic scalars [109][110][111][112].…”

Section: The Cp-even Scalarmentioning

confidence: 99%

Light scalars in neutron star mergers

Dev,

Fortin,

Harris

et al. 2021

Preprint

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Due to their unique set of multimessenger signals, neutron star mergers have emerged as a novel environment for studies of new physics beyond the Standard Model (SM). As a case study, we consider the simplest extension of the SM scalar sector involving a light CP-even scalar singlet S mixing with the SM Higgs boson. These S particles can be produced abundantly in neutron star mergers via the nucleon bremsstrahlung process. We show that the S particles may either be trapped in or stream freely out of the merger remnant, depending on the S mass, its mixing with the SM Higgs boson, and the temperature and baryon density in the merger. In the free-streaming region, the scalar S will provide an extra channel to cool down the merger remnant, with cooling timescales as small as O(ms). On the other hand, in the trapped region, the Bose gas of S particles could contribute a larger thermal conductivity than the trapped neutrinos in some parts of the parameter space, thus leading to faster thermal equilibration than expected. Therefore, future observations of the early postmerger phase of a neutron star merger could effectively probe a unique range of the S parameter space, largely complementary to the existing and future laboratory and supernova limits. In view of these results, we hope the merger simulation community will be motivated to implement the effects of light CP-even scalars into their simulations in both the free-streaming and trapped regimes.

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“…• With couplings exclusively or predominantly to some specific SM flavors, such as the hadronic and leptonic scalars [109][110][111][112].…”

Section: The Cp-even Scalarmentioning

confidence: 99%

Light scalars in neutron star mergers

Dev,

Fortin,

Harris

et al. 2021

Preprint

Self Cite

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show abstract

“…In addition to the neutral component, the charged components of the triplet Higgs, ∆ + and ∆ ++ , play an important role at terrestrial collider experiments. Their phenomenological implications will be integral to the discovery of the Type II Seesaw Mechanism and the determination of its properties [57][58][59][60][61][62][63].…”

Section: Jhep05(2022)160mentioning

confidence: 99%

Type II Seesaw leptogenesis

Barrie

Han

Murayama

2022

J. High Energ. Phys.

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The Type II Seesaw Mechanism provides a minimal framework to explain the neutrino masses involving the introduction of a single triplet Higgs to the Standard Model. However, this simple extension was believed to be unable to successfully explain the observed baryon asymmetry of the universe through Leptogenesis. In our previous work (Phys. Rev. Lett.128 (2022) 141801), we demonstrated that the triplet Higgs of the Type II Seesaw Mechanism alone can simultaneously generate the observed baryon asymmetry of the universe and the neutrino masses while playing a role in setting up Inflation. This is achievable with a triplet Higgs mass as low as 1 TeV, and predicts that the neutral component obtains a small vacuum expectation value v∆< 10 keV. We find that our model has very rich phenomenology and can be tested by various terrestrial experiments as well as by astronomical observations. Particularly, we show that the successful parameter region may be probed at a future 100 TeV collider, upcoming lepton flavor violation experiments such as Mu3e, and neutrinoless double beta decay experiments. Additionally, the tensor-to-scalar ratio from the inflationary scenario will be probed by the LiteBIRD telescope, and observable isocurvature perturbations may be produced for some parameter choices. In this article, we present all the technical details of our calculations and further discussion of its phenomenological implications.

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Section: The Type II Seesaw Mechanism and Model Frameworkmentioning

confidence: 99%

Type II Seesaw Leptogenesis

Barrie,

Han,

Murayama

2022

Preprint

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The Type II Seesaw Mechanism provides a minimal framework to explain the neutrino masses involving the introduction of a single triplet Higgs to the Standard Model. However, this simple extension was believed to be unable to successfully explain the observed baryon asymmetry of the universe through Leptogenesis. In our previous work (Phys. Rev. Lett. 128, 141801), we demonstrated that the triplet Higgs of the Type II Seesaw Mechanism alone can simultaneously generate the observed baryon asymmetry of the universe and the neutrino masses while playing a role in setting up Inflation. This is achievable with a triplet Higgs mass as low as 1 TeV, and predicts that the neutral component obtains a small vacuum expectation value v ∆ < 10 keV. We find that our model has very rich phenomenology and can be tested by various terrestrial experiments as well as by astronomical observations. Particularly, we show that the successful parameter region may be probed at a future 100 TeV collider, upcoming lepton flavor violation experiments such as Mu3e, and neutrinoless double beta decay experiments. Additionally, the tensorto-scalar ratio from the inflationary scenario will be probed by the LiteBIRD telescope, and observable isocurvature perturbations may be produced for some parameter choices. In this article, we present all the technical details of our calculations and further discussion of its phenomenological implications.

show abstract

Leptonic scalars and collider signatures in a UV-complete model

Cited by 15 publications

References 109 publications

Light scalars in neutron star mergers

Light scalars in neutron star mergers

Type II Seesaw leptogenesis

Type II Seesaw Leptogenesis

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