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Accessing the deuteron source with pion–deuteron femtoscopy in Pb–Pb collisions at TeV
No full textFemtoscopy of non-identical particle pairs has been instrumental for precision measurements of both two-particle sources and the final-state interactions in high-energy elementary and heavy-ion collisions. The majority of measurements assessing the source properties are based on identical particle pairs, providing direct access to the characteristics of the single-particle source. The work in this paper demonstrates, via femtoscopy measurements of charged pion–deuteron pairs in Pb–Pb collisions at TeV, the feasibility of accessing the characteristics of the single-particle femtoscopic source by using particle pairs with large mass differences such as pions and deuterons. The first experimental results of the measurement of deuteron source sizes in ultrarelativistic heavy-ion collisions are presented. The results show good agreement with the trend derived from other charged hadrons such as pions, kaons, and protons as a function of transverse mass, indicating similar source properties.Femtoscopy of nonidentical particle pairs has been instrumental for precision measurements of both two-particle sources and the final-state interactions in high-energy elementary and heavy-ion collisions. The majority of measurements assessing the source properties are based on identical particle pairs, providing direct access to the characteristics of the single-particle source. The work in this paper demonstrates, via femtoscopy measurements of charged pion-deuteron pairs in Pb-Pb collisions at sNN=5.02 TeV, the feasibility of accessing the characteristics of the single-particle femtoscopic source by using particle pairs with large mass differences such as pions and deuterons. The first experimental results of the measurement of deuteron source sizes in ultrarelativistic heavy-ion collisions are presented. The results show good agreement with the trend derived from other charged hadrons such as pions, kaons, and protons as a function of transverse mass, indicating similar source properties.Femtoscopy of non-identical particle pairs has been instrumental for precision measurements of both two-particle sources and the final-state interactions in high-energy elementary and heavy-ion collisions. The majority of measurements assessing the source properties are based on identical particle pairs, providing direct access to the characteristics of the single-particle source. The work in this paper demonstrates, via femtoscopy measurements of charged pion-deuteron pairs in Pb-Pb collisions at TeV, the feasibility of accessing the characteristics of the single-particle femtoscopic source by using particle pairs with large mass differences such as pions and deuterons. The first experimental results of the measurement of deuteron source sizes in ultrarelativistic heavy-ion collisions are presented. The results show good agreement with the trend derived from other charged hadrons such as pions, kaons, and protons as a function of transverse mass, indicating similar source propertie
Charged-particle tracking in heavy-ion collisions for ATLAS in Run 4
No full textThe High Luminosity Large Hadron Collider (HL-LHC) will provide additional challenges in the already demanding field of charged particle track reconstruction. The Inner Detector of the ATLAS experiment will be replaced by an all-silicon Inner Tracker (ITk) that will consist of Pixels and Strips providing greater coverage in pseudorapidity spanning up to . The physics of heavy ions (HI) requires a different tracking setup as compared to collisions. This is dictated by the difference in experimental conditions, where instead of a huge number of simultaneous interactions per bunch crossing (up to ), the HI collision events expect only one collision per bunch crossing. Despite this, a central lead ion collision produces a huge number of charged particles to reconstruct, comparable to collisions at . The presence of a single collision vertex enables certain optimizations but also introduces unique challenges. The ATLAS experiment has chosen A Common Tracking Software (ACTS) for the HL-LHC to perform track reconstruction, as it is expected to meet the new challenges ahead. This document highlights the progress in setting up the ACTS-based track reconstruction for HI with the ITk, shows a comparison of expected tracking performance in and HI events, and presents the predicted performance of ACTS compared to the existing tracking algorithms used by ATLAS
Dead cone effect and charm quark mass effects in high-pT D-jets with the CMS experiment
No full textThe mass of heavy quarks modifies the radiation pattern of heavy-quark jets in comparison to their light quark counterparts, since the heavy quark mass effectively regularizes the soft and collinear divergences that would normally dominate the partonic cascade formation. This leads to the depletion of collinear gluon emissions relative to the heavy quark, an effect known as the dead cone effect. The dead cone of heavy-quark jets has been identified as a possible venue to isolate medium-induced radiation in a phase-space region where calculations are viable and where the large underlying event of a heavy-ion collision is absent. Previous measurements based on the construction of an angle-ordered tree of intrajet emissions have shown that it is possible to expose the dead cone experimentally. Novel jet substructure observables and algorithms are used to isolate hard and collinear emissions in the dead cone region with an improved sensitivity to charm quark mass effects using -tagged jets in pp collisions at 5.02 TeV. For the first time, the substructure of charm quark jets with a greater than 100 GeV is analyzed, in a regime that should be relatively insensitive to nonperturbative effects. It is shown that the sensitivity to quark mass effects is present even at high . This result also serves as a baseline for future measurements in heavy-ion collisions
SOCRATES: a radiation-tolerant SoC generator framework
No full textAs front-end ASIC complexity in HEP experiments grows, there is a shift towards more modular, programmable, and cost-effective designs. This work introduces the SOCRATES platform, a radiation-tolerant SoC generator toolset, based on SoCMake, a hardware/software build system that automates SoC assembly and verification. Utilizing existing IP blocks, SoCMake generates the SoC hardware and the software framework to run application code. The platform includes radiation-tolerant IPs and fault-tolerant extensions supporting redundancy and error correction. A prototype ASIC based on the RISC-V Ibex processor, generated using SOCRATES in a 28nm CMOS process, will validate the toolset through SEE and TID testing
Visit by Representatives of the US Congress, in the frame of a Présence Suisse Study Tour
No full textVisit by Representatives of the US Congress, in the frame of a Présence Suisse Study Tour, United States of Americ
Summary Report of the Physics Beyond Colliders Study at CERN
No full textThe Physics Beyond Collider Study Group was initially mandated by the CERN Management to prepare the previous European Particle Physics Strategy Update for CERN projects other than the high-energy frontier colliders. The main findings were summarized in~\cite{PBC_summary_2020}. Following the Update process, the Physics Beyond Collider Study Group was confirmed on a permanent basis with an updated mandate~\cite{PBC_mandate} taking into account the strategy recommendations. The Study Group is now in charge of supporting the proponents of new ideas to address the technical issues and physics motivation of the projects ahead of their external review by the CERN Scientific Committees and decision by the Management. The present document updates the previous PBC summary report~\cite{PBC_summary_2020} to inform the new ongoing European Particle Physics Strategy Update process, taking into account the evolution of the CERN and worldwide landscapes and the new projects under consideration within the Study Group.The Physics Beyond Collider (PBC) Study Group was initially mandated by the CERN Management to prepare the previous European Particle Physics Strategy Update for CERN projects other than the high-energy frontier colliders. The main findings were summarized in an PBC Summary Report submitted to the Strategy Update. Following the Update process, the PBC Study Group was confirmed on a permanent basis with an updated mandate taking into account the strategy recommendations. The Study Group is now in charge of supporting the proponents of new ideas to address the technical issues and physics motivation of the projects ahead of their review by the CERN Scientific Committees and decision by the Management. The present document updates the previous PBC summary report to inform the new ongoing European Particle Physics Strategy Update process, taking into account the evolution of the CERN and worldwide landscapes and the new projects under consideration within the Study Group
EOS 2025 Workshop
No full textData federations with EOS offers various approaches to seamlessly integrate and manage distributed storage across heterogeneous environments. This presentation explores multiple federation techniques and namespace aggregation with remote EOS instances. We will discuss the advantages and trade-offs of each method, considering factors such as performance, scalability, security, and ease of management. Real-world use cases and best practices will be highlighted to help organisations choose the most suitable strategy for their needs