A study of the production of the Higgs boson in association with either a top-quark pair ($t\bar{t}H$) or a single top quark ($tH$) in the $\tau$-lepton-pair decay channel is presented. The analysis relies on final states featuring fully hadronic decays of the top quarks and the $\tau$-leptons. It employs data samples of proton--proton collisions at $\sqrt{s}=13$ and 13.6 TeV recorded with the ATLAS detector at the CERN Large Hadron Collider and corresponding to integrated luminosities of 140 fb$^{-1}$ and 161 fb$^{-1}$, respectively. The measured signal strength ($\mu$), defined as the measured cross-section normalised to the Standard Model prediction, is $\mu_{t\bar{t}H}=1.51^{+0.71}_{-0.62}$ for $t\bar{t}H$ and $\mu_{tH}=-0.4^{+5.6}_{-5.1}$ for $tH$. Additionally, the $t\bar{t}H$ cross-section is measured differentially in three bins of the Higgs boson transverse momentum in the simplified template cross-section framework.
A search is presented for the rare, loop-induced Higgs boson decay H $\to$ Z$\gamma$, where Z $\to$ $\ell^+\ell^-$ and $\ell$ = e or $\mu$. The search is performed using a sample of proton-proton (pp) collision data at the center-of-mass energies of 13 and 13.6 TeV, recorded by the CMS experiment at the LHC and corresp...
The $t$-channel production of a top quark in association with a $Z$ boson, $tZq$, is measured in the trilepton channel. The measured $pp \rightarrow t\ell^+\ell^-q$ process is defined for $m_{\ell\ell}>30\,\text{GeV}$ and includes both resonant $Z$-boson production and non-resonant dilepton production. The data collect...
A search for the electroweak production of a Higgs boson in association with a same-sign $W$ boson pair and two forward jets ($W^{\pm}W^{\pm}Hjj$) is presented. The full Run 2 proton-proton collision dataset recorded at a center-of-mass energy of $\sqrt{s}=13$ TeV by the ATLAS detector at the Large Hadron Collider is u...
We investigate the discovery potential of a singly produced vector-like top quark $T$ via the $T\to tZ$ decay channel at future muon-proton ($\mu p$) colliders, considering three benchmark center-of-mass energies: $\sqrt{s}=5.29$, $6.48$, and $9.16$~TeV. The baseline signal final state consists of a semileptonic top...
Ying-Hao Gao, Yao-Bei Liu· Chinese Physics C, High Ener...· 0 citations
The total decay width of the Higgs boson, $\Gamma_H$, encodes all of its decay modes; any decay into particles beyond the Standard Model (SM) would increase $\Gamma_H$ above the SM prediction of 4.1 MeV. In this Letter, a direct, on-shell measurement of $\Gamma_H$ is reported, exploiting the interference between the re...
Searches for the production of $\tau$-sleptons ($\tilde{\tau}$), charginos ($\tilde{\chi}^{\pm}_1$), and neutralinos ($\tilde{\chi}^0_2$) in events with at least one hadronically decaying $\tau$-lepton are presented, targeting compressed mass spectra scenarios. For charginos and neutralinos, the cascade decays producin...
A. Collaboration· 1 citation
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