Single Higgs boson production in association with a top quark through FCNSI

Abstract

We study the production and possible detection of a single Higgs boson in association with a top quark in proton-proton collisions ($pp\to th+X$) at the High-Luminosity Large Hadron Collider. This process absent in the Standard Model is predicted by other models such as the Two-Higgs Doublet Model of type III, which is the theoretical framework adopted in this work. Promising results are found for specific scenarios of the model parameter space, which consist mainly of the parameters $\tan \beta$, $\cos (\alpha -\beta )$ and the parameter ${\chi }_{tc}$, responsible for the Flavor-Changing Neutral Scalar Interactions (FCNSI). Using the machine learning \textit{Boosted Decision Trees} algorithm and considering a systematic uncertainty of $5\%$, we predict \textit{signal significances} at level of $5\sigma$ for $\tan \beta =1$, $\cos (\alpha -\beta )=0.1$, ${\chi }_{tc}=5$, and integrated luminosities {${\mathcal{L}}_{\mathrm{int}}\gtrsim 2700f{b}^{-1}$}. Likewise, we also predict a \textit{signal significance} $\sigma \approx 4.4$ for $\tan \beta =1$, $\cos (\alpha -\beta )=0.1$, ${\chi }_{tc}=3$, and integrated luminosities ${\mathcal{L}}_{\mathrm{int}}=3000f{b}^{-1}$, which consider the upper limit given by HL-LHC projection on $\mathcal{B}\mathcal{R}(t\to ch)$.

arXiv comment13 pages, 10 figures

References in corpus (31)

• Observation of a new particle in the search for the Standard Model Higgs boson with the ATLAS detector at the LHC
• The automated computation of tree-level and next-to-leading order differential cross sections, and their matching to parton shower simulations
• The anti-k_t jet clustering algorithm
• An Introduction to PYTHIA 8.2
• FastJet user manual
• DELPHES 3, A modular framework for fast simulation of a generic collider experiment
• FeynRules 2.0 - A complete toolbox for tree-level phenomenology
• Theory and phenomenology of two-Higgs-doublet models
• Measurement of the Positive Muon Anomalous Magnetic Moment to 0.46 ppm
• MadAnalysis 5, a user-friendly framework for collider phenomenology
• Observation of a new boson with mass near 125 GeV in pp collisions at sqrt(s) = 7 and 8 TeV
• Phenomenology of Two Higgs Doublet Models with Flavor Changing Neutral Currents
• The Higgs Potential in the Type II Seesaw Model
• Probing top flavour-changing neutral scalar couplings at the CERN LHC
• Measurement of the B${}_{\mathrm{S}}^0$ $\to$ ${\mu }^{+}{\mu }^{-}$ decay properties and search for the B${}^0$ $\to$ ${\mu }^{+}{\mu }^{-}$ decay in proton-proton collisions at $\sqrt{s}$ = 13 TeV
• FeynGame
• Search for lepton flavour violating decays of the Higgs boson to $\mu \tau$ and e$\tau$ in proton-proton collisions at $\sqrt{s}=$ 13 TeV
• Mass matrix Ansatz and lepton flavor violation in the THDM-III
• Searches for lepton-flavour-violating decays of the Higgs boson in $\sqrt{s}=13$ TeV $pp$ collisions with the ATLAS detector
• Measuring the fermionic couplings of the Higgs boson at future colliders as a probe of a non-minimal flavor structure
• Anomalies in Particle Physics
• Flavor Violating Higgs signals in the Texturized Two-Higgs Doublet Model (2HDM-Tx)
• Searches for the FCNC couplings from top-Higgs associated production signal with $h\to \gamma \gamma$ at the LHC
• Fast $b$-tagging at the high-level trigger of the ATLAS experiment in LHC Run 3
• Generalized 2HDM with wrong-sign lepton Yukawa coupling, in light of $g_{\mu }-2$ and lepton flavor violation at the future LHC
• The Higgs Profile in the Standard Model and Beyond
• Flavour-changing neutral scalar interactions of the top quark
• Lectures on Physics Beyond the Standard Model
• Projections for Neutral Di-Boson and Di-Higgs Interactions at FCC-he Collider
• Search for flavour-changing neutral current interactions of the top quark and the Higgs boson in events with a pair of $\tau$-leptons in pp collisions at $\sqrt{s}=13$ TeV with the ATLAS detector
• Searching for a Heavy Neutral CP-Even Higgs Boson in the BLSSM at the LHC Run 3 and HL-LHC