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DUNE Software and Computing Research and Development
No full textThe international collaboration designing and constructing the Deep Underground Neutrino Experiment (DUNE) at the Long-Baseline Neutrino Facility (LBNF) has developed a two-phase strategy toward the implementation of this leading-edge, large-scale science project. The ambitious physics program of Phase I and Phase II of DUNE is dependent upon deployment and utilization of significant computing resources, and successful research and development of software (both infrastructure and algorithmic) in order to achieve these scientific goals. This submission discusses the computing resources projections, infrastructure support, and software development needed for DUNE during the coming decades as an input to the European Strategy for Particle Physics Update for 2026. The DUNE collaboration is submitting four main contributions to the 2026 Update of the European Strategy for Particle Physics process. This submission to the 'Computing' stream focuses on DUNE software and computing. Additional inputs related to the DUNE science program, DUNE detector technologies and R&D, and European contributions to Fermilab accelerator upgrades and facilities for the DUNE experiment, are also being submitted to other streams
Start of interconnection work in the HL-LHC IT String
No full textThe photos capture the start of the interconnection works along the magnet line in the HL-LHC IT String, highlighting the pulling of one of the N lines used to power the magnets. This step is particularly delicate, as the line must be carefully guided through the cryoassemblies, where space is limited and minimising friction is essential to avoid damage. This activity also serves as an important training for the teams involved, who will perform similar operations in the LHC machine during Long Shutdown 3 (LS3)
European Strategy for Particle Physics 2026: the NA60+/DiCE experiment at the SPS
No full textThe exploration of the phase diagram of Quantum ChromoDynamics (QCD) is carried out by studying ultrarelativistic heavy-ion collisions. The energy range covered by the CERN SPS ( GeV) is ideal for the investigation of the region corresponding to finite baryochemical potential (), and was little explored up to now. We propose in this document a new experiment, NA60+/DiCE (Dilepton and Charm Experiment), that will address several observables which are fundamental for the understanding of the phase transition from hadronic matter towards a Quark-Gluon Plasma (QGP) at finite . In particular, we propose to study, in Pb-Pb collisions, as a function of the collision energy, the production of thermal dimuons, from which one can obtain a caloric curve of the QCD phase diagram that may be sensitive to the order of the phase transition. In addition, the measurement of a mixing contribution will provide conclusive insights into the restoration of the chiral symmetry of QCD. Studies of open charm and charmonium production will also be carried out, addressing the measurement of transport properties of the QGP and the investigation of the onset of the deconfinement transition. Reference measurements with proton-nucleus collisions are an essential part of this program. The experimental set-up couples a vertex telescope based on monolithic active pixel sensors (MAPS) to a muon spectrometer with MWPC detectors. Two existing CERN dipole magnets, MEP48 and MNP33, will be used for the vertex and muon spectrometers, respectively. The continuing availability of Pb ion beams in the CERN SPS is a crucial requirement for the experimental program. After the submission of a LoI, the experiment proposal is currently in preparation and is due by mid 2025. The start of the data taking is foreseen by 2029/2030, and should last about 7 years
The W-Si High Precision Preshower Detector of the FASER Experiment at the LHC
No full textFASER is searching for light, weakly-interacting particles at the Large Hadron Collider. The first search for Axion-like particles (ALPs) decaying to a photon pair using data collected in 2022 and 2023 was performed and successfully excluded regions not previously ruled out. To further reduce neutrino background, a new preshower detector will be installed by the end of 2024. The detector is based on a monolithic active pixel sensor in 130 nm SiGe BiCMOS, which will allow resolving the photon pairs interacting in the preshower detector. The final ASICs have been produced in May 2024 and are currently being validated
Deep Reinforcement Learning-based Longitudinal Optimization and Control of the Proton Synchrotron Booster at CERN
No full textThis thesis presents the development and implementation of algorithmic methods for au- tomated optimization software in the accelerator control room at CERN. Specifically, the problem of optimizing longitudinal profiles at PSB beam injection for improved luminosity in LHC-type beams is addressed using deep reinforcement learning methods. A soft-actor- critic RL agent was trained on the online accelerator, and demonstrated promising results by simultaneously reducing the transverse emittance while increasing beam transmission. A surrogate model of the problem was developed using data collected during online train- ing, which was then used to train the agent offline in an attempt to mitigate the impact of low sample availability. The agent was able to consistently solve the offline optimization problem within 13 steps, indicating the potential effectiveness of a fully trained RL agent. However, there are still a number of limitations which need to be addressed, particularly in sample efficiency and the agent’s performance in dynamic environments
Probing Long-Range Forces in Neutrino Oscillations at the ESSnuSB Experiment
No full textNeutrino oscillations constitute an excellent tool to probe physics beyond the Standard Model. In this paper, we investigate the potential of the ESSnuSB experiment to constrain the effects of flavour-dependent long-range forces (LRFs) in neutrino oscillations, which may arise due to the extension of the Standard Model gauge group by introducing new U(1) symmetries. Focusing on three specific U(1) symmetries — L − L, L − L, and L − L, we demonstrate that ESSnuSB offers a favourable environment to search for LRF effects. Our analyses reveal that ESSnuSB can set 90% confidence level bounds of V < 2.99 × 10 eV, V < 2.05 × 10 eV, and V < 1.81 × 10 eV, which are competitive to the upcoming Deep Underground Neutrino Experiment (DUNE). It is also observed that reducing the systematic uncertainties from 5% to 2% improves the ESSnuSB limits on V. Interestingly, we find limited correlations between LRF parameters and the less constrained lepton mixing parameters θ and δ, preserving the robustness of ESSnuSB’s sensitivity to CP violation. Even under extreme LRF potentials (V ≫ 10 eV), the CP-violation sensitivity and δ precision remain largely unaffected. These results establish ESSnuSB as a competitive experimental setup for probing LRF effects, complementing constraints from other neutrino sources and offering critical insights into the physics of long-range forces.[graphic not available: see fulltext]Neutrino oscillations constitute an excellent tool to probe physics beyond the Standard Model. In this paper, we investigate the potential of the ESSnuSB experiment to constrain the effects of flavour-dependent long-range forces (LRFs) in neutrino oscillations, which may arise due to the extension of the Standard Model gauge group by introducing new symmetries. Focusing on three specific symmetries --, , and , we demonstrate that ESSnuSB offers a favourable environment to search for LRF effects. Our analyses reveal that ESSnuSB can set confidence level bounds of , , and , which are competitive to the upcoming Deep Underground Neutrino Experiment (DUNE). It is also observed that reducing the systematic uncertainties from to improves the ESSnuSB limits on . Interestingly, we find limited correlations between LRF parameters and the less constrained lepton mixing parameters and , preserving the robustness of ESSnuSB's sensitivity to CP violation. Even under extreme LRF potentials (), the CP-violation sensitivity and precision remain largely unaffected. These results establish ESSnuSB as a competitive experimental setup for probing LRF effects, complementing constraints from other neutrino sources and offering critical insights into the physics of long-range forces
Higgs Measurements using Simulation Based Inference Techniques (ATLAS+CMS)
No full textThis presentation presents two analyses (one from ATLAS, one from CMS) performed using a novel inference technique, called Simulation-based inference, to perform parameter estimation using Higgs measurements
Experimental Recent Vector Boson Results from ATLAS and CMS
No full textThis talk reports about recent measurements of single or multiple vector bosons with EFT interpretation
Efficiencies of New Low-pT Lepton+HT+b-tag Triggers for Run-3
No full textThis note presents the performance of new lepton + + b-tag cross triggers introduced in 2024 in order to improve the trigger acceptance for events with low- leptons (electrons or muons)
The ATLAS RPC Phase II upgrade for High Luminosity LHC era
No full textResistive Plate Chamber detectors play a crucial role in triggering events with muons in the ATLAS central region}. In view of the High Luminosity LHC program, this system is facing a significant upgrade. In the next few years, 226 triplets of new generation RPCs will be installed in the innermost region of the ATLAS Muon Barrel Spectrometer while 80 triplets in the outer Muon Spectrometer (MS) region, increasing the number of tracking layers from 6 to 9, doubling the trigger lever arm and increasing the coverage. The new Barrel Inner RPCs (BI-RPC) have an improved rate capability up to to withstand the HL-LHC conditions. This contribution will present an overview of the ATLAS RPC Phase II project, the qualification of gas volumes and read out planes, the present status of RPC singlets production and tests