Preprints

Constraints on Wilson coefficients (WCs) corresponding to dimension-6 operators of the standard model effective field theory (SMEFT) are determined from a simultaneous fit to seven sets of CMS measurements probing Higgs boson, electroweak vector boson, top quark, and multijet production. Measurements of electroweak precision observables are also included and provide complementary constraints to those from the CMS experiment. [...]

We search for $Ξ^0p$, $Ω^-p$, and $Ω^-n$ dibaryon states in $Υ(1S)$ and $Υ(2S)$ decays, probing mass regions near the corresponding baryon-pair thresholds. Multistrange baryon-baryon interactions are relevant to neutron-star matter but remain largely unconstrained. [...]

We perform a measurement of time-dependent $CP$ violation parameters in $B^{0} \to K_{S}^{0} π^{0} γ$ decays using a dataset of approximately $772 \times 10^6$ and $521 \times 10^6$$Υ(4S)$ decays collected by the Belle and Belle II experiments, respectively. The measured parameters for the combined dataset in the $K^{*0}(892)$ dominated region ($M_{K_{S}^{0} π^{0}} \in [0.8,1.0] \mathrm{GeV}/c^2$) are $S = 0.09 \pm 0.16 \pm 0.02$ and $C = -0.09 \pm 0.08 \pm 0.04$. [...]

This paper presents the first differential fiducial measurements of $γγ\toττ$ using 1.93 nb$^{-1}$ of Pb+Pb data at $\sqrt{s_{_\text{NN}}} = 5.02$ TeV recorded by the ATLAS detector. Events in which one of the $τ$-leptons decays into a muon and two neutrinos $τ\toν_τ\barν_μμ$ are selected and are categorized into three regions by the presence of an electron or either one or three charged-particle track(s) from the second $τ$-lepton decay [...]

After ten years of operation at the LHC, the planar pixel sensors of the innermost barrel layer of the ATLAS Pixel detector have accumulated an average bulk damage fluence in excess of $2\times10^{15}$ 1 MeV-neutrons equivalent/cm$^2$. The macroscopic effects of this radiation are an increase of the sensor leakage current, a loss of charge collection efficiency and an increase of the depletion voltage. [...]

A search for dijet resonances in the mass range of 100-250 GeV is presented using proton-proton collision data recorded by the ATLAS experiment at the Large Hadron Collider at a centre-of-mass energy of 13 TeV. Conventional searches for hadronic resonances in the sub-TeV regime are heavily constrained by high jet trigger thresholds required to manage the overwhelming rate of Standard Model multijet background processes described by quantum chromodynamics. [...]

A search for leptoquark signals is performed in final states with a hadronically decaying $τ$-lepton and missing transverse momentum, using data from proton--proton collisions at a centre-of-mass energy of $\sqrt{s}=13$ TeV recorded by the ATLAS detector at the Large Hadron Collider during Run 2 (2015--18), corresponding to an integrated luminosity of 140 fb$^{-1}$. The analysis is designed to probe both resonant production and non-resonant $t$-channel exchange of the leptoquark, covering a wide range of coupling scenarios. [...]

This paper presents a measurement of the production cross-section of a $W$ boson associated with one or two jets, where at least one jet originates from a $b$-quark. The data are collected with the ATLAS detector at the LHC in proton-proton collisions at $\sqrt{s}=13$ TeV, corresponding to an integrated luminosity of 140 fb$^{\text -1}$. [...]

A search for pair-produced vector-like $T$-quarks in 139 fb$^{-1}$ of $pp$ collisions recorded by the ATLAS detector at a centre-of-mass energy $\sqrt{s}$=13 TeV is presented. The search targets signal events where at least one $T$-quark decays into a Higgs boson and a top quark, $T\rightarrow Ht$, with subsequent decays of the Higgs boson into a bottom quark-antiquark pair, $H\rightarrow b\bar{b}$, and the top quark into a light charged lepton, a neutrino and a bottom quark, $t\rightarrow\ell^+ν_\ell b$, where $\ell=e/μ$. [...]

A study of the structure of the coupling between the Higgs boson and the top quark is performed using events from $t\bar{t}H$ and $tH$ production in the $H\rightarrowγγ$ decay channel, with 164 fb$^{-1}$ of proton-proton collision data at a center-of-mass energy of $\sqrt{s}$ = 13.6 TeV collected by the ATLAS detector at the LHC. The cross section of the $t\bar{t}H$ process times the Higgs to diphoton decay branching ratio is measured to be $1.46^{+0.40}_{-0.35} = 1.46^{+0.34}_{-0.32}\,\text{(stat.)}^{+0.22}_{-0.13}\,\text{(sys.)}$ fb, corresponding to $1.13^{+0.33}_{-0.28}$ times the Standard Model prediction. [...]