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Signatures of vector-like top partners decaying into new neutral scalar or pseudoscalar bosons

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arxiv 1907.05929 v4 pith:B4X5GZUS submitted 2019-07-12 hep-ph

Signatures of vector-like top partners decaying into new neutral scalar or pseudoscalar bosons

Rachid Benbrik , Elin Bergeaas Kuutmann , Diogo Buarque Franzosi , Venugopal Ellajosyula , Rikard Enberg , Gabriele Ferretti , Max Isacson , Yao-Bei Liu
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Tanumoy Mandal Thomas Mathisen Stefano Moretti Luca Panizzi
This is my paper
classification hep-ph
keywords rightarrowmodeldecaydecaysgammascalarassumingbosons
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We explore the phenomenology of models containing one Vector-Like Quark (VLQ), $t'$, which can decay into the Standard Model (SM) top quark, $t$, and a new spin-0 neutral boson, $S$, the latter being either a scalar or pseudoscalar state. We parametrise the underlying interactions in terms of a simplified model which enables us to capture possible Beyond the SM (BSM) scenarios. We discuss in particular three such scenarios: one where the SM state is supplemented by an additional scalar, one which builds upon a 2-Higgs Doublet Model (2HDM) framework and another which realises a Composite Higgs Model (CHM) through partial compositeness. Such exotic decays of the $t'$ can be competitive with decays into SM particles, leading to new possible discovery channels at the Large Hadron Collider (LHC). Assuming $t'$ pair production via strong interactions, we design signal regions optimised for one $t'\rightarrow S t$ transition (while being inclusive on the other \bar{t'} decay, and vice versa), followed by the decay of $S$ into the two very clean experimental signatures $S\rightarrow \gamma \gamma$ and $S\rightarrow Z(\rightarrow \ell^+\ell^-)\gamma$. We perform a dedicated signal-to-background analysis in both channels, by using Monte Carlo (MC) event simulations modelling the dynamics from the proton-proton to the detector level. Under the assumption of BR$(t' \rightarrow S t) = 100\%$, we are therefore able to realistically quantify the sensitivity of the LHC to both the $t'$ and $S$ masses, assuming both current and foreseen luminosities. This approach paves the way for the LHC experiments to surpass current VLQ search strategies based solely on $t'$ decays into SM bosons ($W^\pm, Z$, $h$).

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Cited by 7 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score.

  1. Search for pair-production of vector-like $T$ quarks decaying into a top quark and a spin-0 particle in the diphoton final state in proton proton collisions at $\sqrt{s}=13$ TeV with the ATLAS detector

    hep-ex 2026-07 accept novelty 6.5

    No excess is observed in a first ATLAS search for pair-produced vector-like T quarks decaying via an exotic spin-0 particle to diphotons; fiducial cross-section limits and a model exclusion up to m_T≈1620 GeV are set.

  2. Composite top partners in exotic colour representations

    hep-ph 2026-05 unverdicted novelty 6.0

    Colour-sextet top partners in composite Higgs models are excluded up to 2-2.5 TeV by current LHC data via top-rich decays, with HL-LHC reach near 3 TeV.

  3. Search for pair production of heavy resonances in final states with a photon and large-radius jets in proton-proton collisions at $\sqrt{s}$ = 13 TeV

    hep-ex 2026-02 accept novelty 6.0

    Using 138 fb^-1 of CMS data, the first tt-gamma-g channel search finds no excess and excludes spin-1/2 (spin-3/2) excited top quarks below 930 (1330) GeV.

  4. Real and Complex Singlet-Scalar Benchmarks with a Vector-Like Down Quark for $B\to X_s\gamma$ and $B_s-\bar B_s$ Mixing

    hep-ph 2026-05 unverdicted novelty 5.0

    In minimal benchmarks with a vector-like down quark D and singlet scalar, the new-physics contribution to B to X_s gamma is only 0.4 percent of the Standard Model value at TeV scales, while B_s mixing imposes stronger...

  5. Non-standard decays of vector-like top partners in a $2$-Higgs doublet model at the HL-LHC

    hep-ph 2026-06 unverdicted novelty 4.0

    Collider analysis shows the 2τ + 2b + MET channel can probe vector-like top partners up to 1.9 TeV in 2HDM scenarios at HL-LHC.

  6. Impact of hidden heavy Higgs channels of VLB-Quarks below 1 TeV in 2HDM

    hep-ph 2026-04 unverdicted novelty 4.0

    Hidden BSM decays of vector-like bottom quarks in 2HDM-II relax LHC mass limits from ~1.5 TeV to 1.34 TeV for singlets and 0.98 TeV for doublets.

  7. Probing Heavy Neutral Higgs Bosons via Single Vector-Like Bottom Quark Production at the HL-LHC

    hep-ph 2026-03 unverdicted novelty 4.0

    XGBoost multivariate analysis extends the 5-sigma discovery reach for singly produced vector-like bottom quarks decaying via heavy neutral Higgs bosons to 1.6 TeV at the HL-LHC with 3 ab^{-1}.