Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Signatures of vector-like top partners decaying into new neutral scalar
  or pseudoscalar bosons   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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The categories of this paper are: cmp-lg
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The categories of this paper are: nucl-th
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The categories of this paper are: acc-phys
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The categories of this paper are: q-fin
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The categories of this paper are: hep-th
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The categories of this paper are: chao-dyn
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The categories of this paper are: bayes-an
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The categories of this paper are: stat
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The categories of this paper are: hep-ex
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The categories of this paper are: atom-ph
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The categories of this paper are: ao-sci
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The categories of this paper are: astro-ph
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The categories of this paper are: math-ph
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The categories of this paper are: hep-lat
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The categories of this paper are: q-bio
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The categories of this paper are: physics