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 $\mathcal{B}\mathcal{R}(t\to ch)$.

13 pages, 10 figures

References in corpus (13)

• 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
• An Introduction to PYTHIA 8.2
• Measurement of the Positive Muon Anomalous Magnetic Moment to 0.46 ppm
• MadAnalysis 5, a user-friendly framework for collider phenomenology
• 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
• Anomalies in Particle Physics
• 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
• Flavour-changing neutral scalar interactions of the top quark
• 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