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Search: authors:"Seodong Shin"

7 papers found.
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Dark matter “transporting” mechanism explaining positron excesses

Abstract We propose a novel mechanism to explain the positron excesses, which are observed by satellite-based telescopes including PAMELA and AMS-02, in dark matter (DM) scenarios. The novelty behind the proposal is that it makes direct use of DM around the Galactic Center where DM populates most densely, allowing us to avoid tensions from cosmological and astrophysical...

New constraints and discovery potential for Higgs to Higgs cascade decays through vectorlike leptons

One of the cleanest signatures of a heavy Higgs boson in models with vectorlike leptons is \( H\to {e}_{{}^4}^{\pm }{\ell}^{\mp}\to h{\ell}^{+}{\ell}^{-} \) which, in two Higgs doublet model type-II, can even be the dominant decay mode of heavy Higgses. Among the decay modes of the standard model like Higgs boson, h, we consider \( b\overline{b} \) and γγ as representative...

New decay modes of heavy Higgs bosons in a two Higgs doublet model with vectorlike leptons

In models with extended Higgs sector and additional matter fields, the decay modes of heavy Higgs bosons can be dominated by cascade decays through the new fermions rendering present search strategies ineffective. We investigate new decay topologies of heavy neutral Higgses in two Higgs doublet model with vectorlike leptons. We also discus constraints from existing searches and...

Two Higgs doublet model with vectorlike leptons and contributions to pp → W W and H → W W

We study a two Higgs doublet model extended by vectorlike leptons mixing with one family of standard model leptons. Generated flavor violating couplings between heavy and light leptons can dramatically alter the decay patterns of heavier Higgs bosons. We focus on pp → H → ν 4 ν μ → W μν μ , where ν 4 is a new neutral lepton, and study possible effects of this process on the...

Contributions of flavor violating couplings of a Higgs boson to pp → W W

distributions fit nicely the experimentally determined ones. This scenario can arise for example in a two Higgs doublet model with vectorlike leptons. Radovan Derm´ıˇsek; Enrico Lunghi and Seodong Shin

Limits on vectorlike leptons from searches for anomalous production of multi-lepton events

We consider extensions of the Standard Model by vectorlike leptons and set limits on a new charged lepton, e 4 ± , using the ATLAS search for anomalous production of multi-lepton events. It is assumed that only one Standard Model lepton, namely the muon, dominantly mixes with vectorlike leptons resulting in possible decays e 4 ± → W ± ν μ , e 4 ± → Zμ ±, and e 4 ± → hμ ±. We...

A new avenue to charged Higgs discovery in multi-Higgs models

Current searches for the charged Higgs at the LHC focus only on the τν, cs, and tb final states. Instead, we consider the process pp → Φ → W ± H ∓ → W + W − A where Φ is a heavy neutral Higgs boson, H ± is a charged Higgs boson, and A is a light Higgs boson, with mass either below or above the \( b\overline{b} \) threshold. The cross-section for this process is typically large...