Documents in process

The magnetic line defect in the O(N) model gives rise to a non-trivial one-dimensional defect conformal field theory of theoretical and experimental value. This model is considered here in $d = 4-\varepsilon$ and the full spectrum of defect operators with dimensions close to one, two and three at order ɛ is presented. [...]

Many lattice QCD simulations now have many lattice spacings available, and it is of interest to investigate how they scale. In this talk we first derive renormalisation group equations appropriate for 2+1 clover fermions. [...]

We investigate the potential of future electron-positron colliders, such as FCC-ee and CEPC, to probe 2-Higgs-doublet models (2HDMs) that facilitate a strong first-order electroweak phase transition (SFOEWPT), a necessary condition for electroweak baryogenesis. Focusing on a 2HDM in the CP-conserving limit, we identify parameter regions consistent with an SFOEWPT and evaluate their compatibility with projected precision electroweak and Higgs measurements, as well as searches for exotic Higgs bosons. [...]

A measurement of the top-quark pole mass $m_{t}^\text{pole}$ is presented in $t\bar{t}$ events with an additional jet, $t\bar{t}+1\text{-jet}$, produced in $pp$ collisions at $\sqrt{s}=13$ TeV. The data sample, recorded with the ATLAS experiment during Run 2 of the LHC, corresponds to an integrated luminosity of 140 $\text{fb}^{-1}$. [...]

Luminosity is a fundamental parameter in any particle collider, linking measured event rates to cross sections of physics processes. In this contribution, the key ingredients of the ATLAS luminosity determination are outlined, with a focus on measurements performed with the Inner Detector in Run 3 of the LHC. [...]

A high-precision measurement of luminosity is essential for all ATLAS physics analyses, with the luminosity uncertainty limiting precise cross-section measurements of W, Z, and top-quark processes. The preliminary ATLAS luminosity calibration in Run 3 of the LHC is presented, with a particular focus on measurements using the Inner Detector. [...]

Many theories beyond the Standard Model predict new phenomena giving rise to multijet final states. These jets can originate from the decay of heavy resonances into Standard Model quarks or gluons, or from more complex decay chains involving dark-sector particles. [...]

The study of Higgs boson production in association with one or two top quarks offers a unique opportunity to probe the interactions between the two heaviest particles in the Standard Model. This talk presents measurements of key Higgs boson properties - specifically the production cross section and CP nature - in events produced via tH and ttH processes. [...]

This talk presents ATLAS differential cross-section measurements of τ-lepton pair production in ultra-peripheral Pb+Pb collisions. The 2015 and 2018 Pb+Pb datasets are utilised and correspond to 1.93 nb−1 recorded at √sNN= 5.02 TeV..