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Muon Track Matching
No full textFor most physical processes the tracks observed in the muon stations must be matched with the corresponding tracks in the inner tracker, the external muon system providing muon identification and triggering but the tracker points giving the precise momentum measurement at lower momenta. For high momenta the momentum resolution is much improved by the interconnection of inner and outer measurements. The matching of outer and inner measurements is more delicate in case of muons embedded in jets. A study of the matching procedure was carried out using samples of b anti-b jets at high Pt, requiring b anti-b -> muon decays
Exploratory meeting on enabling AI in HEP experiment and theory: software/tools, operations, wider engagement and skills capacity
No full textOver the past three decades, High Energy Physics (HEP) has successfully leveraged Artificial Intelligence (AI) across numerous aspects, including data analysis, theory calculations, detector calibration/monitoring, and real-time data selection. AI’s importance in HEP is only set to grow further, and it is essential to the future of the field that it fully exploits its potential, but the UK community currently lacks a strategic and coordinated approach to achieve this goal. Establishing a UK AI HEP framework is essential to overcome common barriers and challenges while harnessing opportunities in areas such as hardware, software, AI-ops, skills/training, knowledge exchange, capacity building, industry engagement, and fast-AI. To address this need, a community workshop was held in October 2024, and this document details its findings, including a concise summary of recommendations. This document provides a preliminary action plan towards enabling AI for HEP in the UK and acts as input to the UK's submission to the European Strategy for Particle Physics. Appendix A contains a more detailed workshop summary, and Appendix B contains case-studies from the application of AI in HEP
EN Newsletter Issue #2 - 21 June 2021
No full textInside this issue: Page 1: Editorial - Lars Jensen, DAO corner – Rachelle Decreuse-Michaud, Safety risk analysis - EN Safety office, Analyse des risques - Service Sécurité EN, Scheduling Tools Project – Julie Coupard and Antoine Ansel, Pollution Dispersion Simulations with ANSYS Fluent in the CFD Team – Uwe Kauflin , Optical fibre sensing technology - Diego Di Francesca and Daniel Ricci, Infor EAM: Asset & Maintenance Management Platform at CERN – David Widegren, Additive Manufacturing, let your imagination take over! - Gilles Favre and Romain Gérar
Arithmetical functions: an introduction to elementary and analytic properties of arithmetic functions and to some of their almost-periodic properties
No full textLuminosity measurements at CMS using DT Phase 2 Demonstrator
No full textIn Phase-2, CMS will rely on multiple detector systems and, in particular, DT Luminosity, this is the Synchronous histogramming of muon trigger primitives. In this phase hits from DT and RPC detectors will be combined to reconstruct muon track segments. The demonstrator system is equipped with 5 back-end boards. This report shows an analysis of several datasets recorded in 2023. Most of the analysis was performed for Fill 9062 (Stable Beams, 2452 colliding bunches). Background contributions such as type1 afterglow hits, cosmic and beam induced were analysed. Finally, the luminosity for one of the boards was computed
European Strategy for Particle Physics 2026: Input from the ALICE Collaboration
No full textThe ALICE Collaboration is planning to build a new experimental apparatus, ALICE 3, to be installed during Long Shutdown 4, that will ensure the full exploitation, before the end of the HL-LHC operations, of the unique environment for the study of the quark-gluon plasma (QGP) offered by nuclear collisions at the multi-TeV scale. The very high QGP temperatures, the abundant production of heavy flavours and the very large single-event multiplicities available at the LHC have already provided major inroads in the understanding of the emergent properties of the QGP and opened an era of systematic quantitative measurements of its physical parameters that are well underway for Run 3 and Run 4. The HL-LHC still allows access to a number of new, powerful, but as yet unexplored, experimental observables to understand the approach to thermal equilibrium, measure the temperature of the QGP and its evolution, provide access to fundamental aspects of the phase transition, and to use LHC as a laboratory for hadron physics. In order to make progress in these areas, excellent pointing resolution is required to identify heavy flavour hadrons, including beauty at low , multi-charm baryons, and to enable angular and momentum correlation measurements of charm hadrons. Furthermore, lepton and hadron identification are required to obtain clean access to thermal dielectron emission and signatures of chiral symmetry restoration. Large acceptance and high rate capabilities are needed to ensure sufficient coverage for correlation measurements, to map the rapidity dependence of key processes and to ensure sufficient precision for rare probes. Starting from today’s state-of-the-art technology, such requirements can be satisfied with a compact experimental apparatus based on silicon sensors, as optimised in the ALICE 3 design. Besides ensuring the accomplishment of the HL-LHC QGP physics campaign, the unique features of ALICE 3 also offer opportunities for the study of exotic hadrons and searches for BSM particles, such as dark photons and axion-like particles
ATLAS Searches for Supersymmetry
No full textSupersymmetry (SUSY) provides elegant solutions to several problems in the Standard Model, and searches for SUSY particles are an important component of the LHC physics program. The direct production of electroweak SUSY particles, including sleptons, charginos, and neutralinos, is a particularly interesting area with connections to dark matter and the naturalness of the Higgs mass. Naturalness arguments also favour supersymmetric partners of the gluons and third-generation quarks with masses light enough to be produced at the LHC. This talk will highlight the most recent results of searches performed by the ATLAS experiment for supersymmetric particles, considering both electroweak and strong production modes. With increasing mass bounds on more classical MSSM scenarios other variations of supersymmetry become increasingly interesting. Results for compressed, non-minimal, and R-parity violating scenarios and recent interpretations in the context of the pMSSM are also presented
Latest Higgs Inclusive and Differential Cross-Section Measurements
No full textSummary of latest Higgs inclusive and differential cross-section measurements in ATLAS and CM
Revealing the microscopic mechanism of deuteron formation at the LHC
No full textThe formation of light (anti)nuclei with mass number A of few units (e.g., d, He, and He) in high-energy hadronic collisions presents a longstanding mystery in nuclear physics [1, 2]. It is not clear how nuclei bound by a few MeV can emerge in environments characterized by temperatures above 100 MeV [3–5], about 100,000 times hotter than the center of the Sun. Despite extensive studies, this question remained unanswered. The ALICE Collaboration now addresses it with a novel approach using deuteron–pion momentum correlations in proton-proton (pp) collisions at the Large Hadron Collider (LHC). Our results provide model-independent evidence that about 80% of the observed (anti)deuterons are produced in nuclear fusion reactions [6] following the decay of short-lived resonances, such as the . These findings resolve a crucial gap in our understanding of nucleosynthesis in hadronic collisions. Beyond answering the fundamental question on how nuclei are formed in hadronic collisions, the results can be employed in the modeling of the production of light and heavy nuclei in cosmic rays [7] and dark matter decays [8, 9].The formation of light (anti)nuclei with mass number A of a few units (e.g., d, He, and He) in high-energy hadronic collisions presents a longstanding mystery in nuclear physics [1,2]. It is not clear how nuclei bound by a few MeV can emerge in environments characterized by temperatures above 100 MeV [3-5], about 100,000 times hotter than the center of the Sun. Despite extensive studies, this question remained unanswered. The ALICE Collaboration now addresses it with a novel approach using deuteron-pion momentum correlations in proton-proton (pp) collisions at the Large Hadron Collider (LHC). Our results provide model-independent evidence that about 80% of the observed (anti)deuterons are produced in nuclear fusion reactions [6] following the decay of short-lived resonances, such as the . These findings resolve a crucial gap in our understanding of nucleosynthesis in hadronic collisions. Beyond answering the fundamental question on how nuclei are formed in hadronic collisions, the results can be employed in the modeling of the production of light and heavy nuclei in cosmic rays [7] and dark matter decays [8,9]