Thermomechanical properties of epoxy and wax matrix composites for superconducting magnets

Thermomechanical properties of epoxy resin systems and paraffin wax for the vacuum impregnation of superconducting magnet coils have been studied at ambient and at cryogenic temperatures. Parameters for the thermomechanical modelling of isotropic pure resins and anisotropic S2 glass fibre reinforced composites, and their stress limits under uniaxial tensile, bending and shear loading have been determined

Estimation of backgrounds from jets misidentified as tau leptons using the Universal Fake Factor method with the ATLAS detector

Physical processes with one or more τ-lepton in the final state play an important role in several analyses of the ATLAS experiment physics program. The usage of hadronic channels, in which τ-leptons decay into one or more pions, enables to exploit the large statistics associated with hadronic τ-lepton decays, but also requires a precise estimate of a sizable background of hadronic jets mis-reconstructed as fake τ-leptons. This poster will present a new technique developed by the ATLAS Collaboration to estimate the fake τ-lepton background from data - the Universal Fake Factor method. This technique improves on previous methodologies as it enables a more solid validation of the estimated background. Details on how to implement this methodology will be given as well as on its validation with single and di-τ final states. Information on ATLAS physics analyses that successfully exploited this technique will also be given

Prospects for Higgs Boson Research at the LHC

The search for Higgs bosons in the Standard Model (SM) of particle physics and Beyond the Standard Model (BSM) started intensively at the Large-Electron-Positron (LEP) collider, which operated from 1989 to 2000, and later at the Tevatron from 2001 to 2011. In 2012, with the discovery of a Higgs boson at the Large Hadron Collider (LHC) at CERN, a new era began. This let to precision measurements of the Higgs boson properties which, so far, are all consistent with the SM expectations. Many searches for predicted BSM Higgs bosons advanced the field of experimental Higgs boson physics. The LHC operated already in three running periods: Run-1 from 2010 to 2012, Run-2 from 2015 to 2018, and currently Run-3 from 2022-2026. The High Luminosity LHC (HL-LHC) operation is foreseen from 2029. The prospects of experimental Higgs boson research for the next decade are reviewed

Measurements of rare electroweak processes including vector boson scattering and tri-boson production with ATLAS

Measurements of rare processes in the electroweak sector provide unprecedented constraints of the SM theory, and unique sensitivity to study the electroweak symmetry breaking (VBS processes) and the quartic boson self-couplings (VBS and triboson processes). In addition to cross-section measurements, studies of boson polarization states in VBS processes are being actively pursued to bring further sensitivity to new phenomena. This talk summarizes recent results from ATLAS on this topic

Machine Learning Framework for Anomaly Detection and Maintenance Optimization in Large-Scale Cryogenic Systems

This work presents a machine learning framework designed for anomaly detection and prescriptive maintenance tested on the helium compression system installed at CERN. The Large Hadron Collider (LHC) features an extensive cryogenic infrastructure, essential for its operation. Our framework leverages data acquired from 20 custom motor-compressor systems, with comprehensive tracking of operational parameters and vibration data since their commissioning. Exploiting deep autoencoders, the system detects anomalies by reconstructing operational signals and identifying deviations from nominal behaviour. Experimental results demonstrate the framework’s reliability in detecting and labeling anomalies. Moreover, we extended the capabilities of the system to provide an estimate of the Remaining Useful Life (RUL) of the compression system machinery. The result is a framework that effectively allows to improve the infrastructure’s availability and reduce maintenance costs.Designed for computational efficiency, the algorithm can be smoothly scaled down to be integrated into edge devices for on-site, real-time data processing and integration of federated learning. Such infrastructure can be developed leveraging CERN’s secure federated learning platform CAFEIN FL [1], allowing the developed framework to further enhance its robustness and accuracy through collaborative model improvement across multiple devices and facilities without compromising data privacy

ATLAS Outreach and Education

The ATLAS Experiment on the Large Hadron Collider at CERN is one of the largest most complex scientific instruments ever constructed. It has been built and operated by an international collaboration of over 5900 members of 103 nationalities from 243 institutes around the world. While the scientific goals and results of the experiment are continually reported to colleagues in the field through conferences, journals and seminars, the collaboration makes a dedicated effort to engage other key audiences with the excitement of its achievements. These audiences range from young children and students, members of the media, politicians and scientists in the same or different fields. Efforts include effective sustained online communication, development of educational material, including Masterclasses and open data programmes, creation of exhibitions and events at festivals, hosting of local and virtual visits to the experiment, and much more. The work is led by members of the collaboration, supported by a dedicated Outreach team including expertise in education and communication. We report on recent developments and plans, as well as the challenges faced by the current fragmented media landscape

ALICE Collaboration Board (1 Jul 2025)

Chair: Alessandra Fanton Deputy: Edith Zinhle Buthelezi Deputy: Ionut Cristian Arsene Secretary: Gustavo Conesa Balbastr

A detailed study on the prospects for a tt‾\mathrm{t\overline{t}} threshold scan in e+e−\mathrm{e^+e^-} collisions

A scan of the beam energy across the top quark pair ($\mathrm{t\overline{t}}$) production threshold is part of the program of future Higgs, top, and electroweak factory projects. In this paper, we provide projections for the achievable precision in the top quark mass ($m_\mathrm{t}$), width ($\Gamma_\mathrm{t}$), and Yukawa coupling ($y_\mathrm{t}$) at the electron-positron ($\mathrm{e^+e^-}$) stage of the Future Circular Collider (FCC-ee). The study includes a detailed assessment of parametric and systematic uncertainties, as well as a rigorous estimate of the effect of point-to-point correlations. We project that $m_\mathrm{t}$ and $\Gamma_\mathrm{t}$ can be determined with an experimental precision of about 6.8 and 11.5 MeV, respectively, when $m_\mathrm{t}$ is defined in the potential-subtracted (PS) scheme. The impact of theoretical uncertainties due to missing higher orders is found to be of about 35 (25) MeV on $m_\mathrm{t}$ ($\Gamma_\mathrm{t}$) at N$^3$LO in non-relativistic QCD. Therefore, improvements in the theoretical accuracy, which is an active area of development, are key to match the achievable experimental precision at a future $\mathrm{e^+e^-}$ collider. Finally, we explore the prospects for a measurement of $y_\mathrm{t}$ at FCC-ee via a dedicated run above the $\mathrm{t\overline{t}}$ production threshold