Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Heavy Neutrino Searches via Same-sign Lepton Pairs at the Higgs Factory   This paper investigates the $e^-e^+\to Zh_1$ sensitivity for Higgs boson's
rare decay into heavy neutrinos $h_1 \to NN$ at the proposed electron-positron
collider, with the focus on multi-lepton final states that contain same-sign
lepton pairs. $h_1 \to NN$ decay can derive from Higgs boson's mixing with new
physics scalar(s) that is complementary to the contribution from active-sterile
neutrino mixings. We consider the scenario with a singlet scalar which gives
the heavy neutrino mass and has a small mixing with the SM Higgs boson. We
analyze the semileptonic, fully leptonic and mixed $NN$ decay scenarios, and
categorize the signal on the number of leptons in the final state: $ \ell^\pm
\ell^\pm$ with at least 3 jets, $\ell^\pm \ell^\pm \ell$ with at least 2 jets,
and $e^\pm e^\pm \mu^\mp \mu^\mp$ plus with at least 1 jet, each containing one
or two same-sign dilepton system(s). Selection cuts are optimized for the
presence of the associated $Z$-boson, which leads to additional backgrounds at
the $e^-e^+$ collider. The Standard Model background channels are
systematically analyzed. Sensitivity limits on $h_1 \rightarrow NN$ branching
fractions are derived for signals with 2-4 final leptons assuming the heavy
neutrino masses are between 10 and 60 GeV. With 240 GeV center-of-mass energy
and 5.6 ab$^{-1}$ design luminosity, $h_1 \rightarrow NN$ branching fraction
can be probed to $2\times 10^{-4}$ in $2\ell$ and $3\ell$ channels, and
$6\times 10^{-4}$ in the $4\ell$ channel at $95\%$ confidence level. $3\ell,
4\ell$ channels expect one or fewer background event, and their sensitivities
saturate the statistic limit at 5.6 ab$^{-1}$ luminosity. A same-sign trilepton
($\ell^\pm \ell^\pm \ell^\pm$) signal in the $3\ell$ channel is also discussed.
Our search strategy provides an approach to discovering the singlet scalar and
exploring the origin of neutrino masses at future $e^-e^+$ colliders.

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The categories of this paper are: plasm-ph
11
The categories of this paper are: hep-lat
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The categories of this paper are: bayes-an
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The categories of this paper are: cmp-lg
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The categories of this paper are: q-bio
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The categories of this paper are: patt-sol
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The categories of this paper are: mtrl-th
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The categories of this paper are: nucl-th
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The categories of this paper are: astro-ph
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The categories of this paper are: alg-geom
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The categories of this paper are: solv-int
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The categories of this paper are: stat
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The categories of this paper are: cs
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The categories of this paper are: q-fin
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The categories of this paper are: comp-gas
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The categories of this paper are: gr-qc