International Linear Collider
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Contribution of ALEGRO to the Update of the European Strategy on Particle Physics
No full textAdvanced and novel accelerators (ANAs), driven a by laser pulse or a relativistic particle bunch, have made remarkable progress over the last decades. They accelerated electrons by 10GeV in 30cm (laser driven) and by 42GeV in 85cm (particle bunch driven). Rapid progress continues with lasers, plasma sources, computational methods, and more. In this document we highlight the main contributions made by the various major collaborations, facilities, and experiments that develop ANAs for applications to particle and high-energy physics. These include: ALiVE, ANL-AWA, AWAKE, BNL-ATF, CEPC Injector, DESY-KALDERA, ELI ERIC, EuPRAXIA, HALHF, LBNL-BELLA, LBNL-kBELLA, LCvison, PETRA IV Injector, 10TeV Collider design, SLAC-FACET II, as well as the development of structures, lasers and plasma sources, and sustainability, and demonstrate the intense activities in the field. ANAs can have, and already have, applications to particle and high-energy physics as subsystems, the so-called intermediate applications: injectors, lower energy experiments, beam dump experiments, test beds for detectors, etc. Additionally, an ANA could be an upgrade for any Higgs factory based on a linear accelerator, as proposed in the LCvison project. ANAs have advantages over other concepts for reaching multi-TeV energies: lower geographical and environmental footprints, higher luminosity to power ratio, and are thus more sustainable than other accelerators. However, ANAs must still meet a number of challenges before they can produce bunches with parameters and the luminosity required for a linear collider at the energy frontier. It is therefore extremely important to strongly support vigorous R&D of ANAs, because they are, at this time, the most sustainable acceleration scheme to reach very high energies with a linear accelerator
Logarithmically-accurate and positive-definite NLO shower matching
No full textWe present methods to achieve NLL+NLO accurate parton showering for processes with two coloured legs: neutral- and charged-current Drell-Yan, and Higgs production in collisions, as well as DIS and to jets. The methods include adaptations of existing approaches, as well as a new NLO matching scheme, ESME, that is positive-definite by construction. Our implementations of the methods within the PanScales framework yield highly competitive NLO event generation speeds. We validate the fixed-order and combined resummation accuracy with tests in the limit of small QCD coupling and briefly touch on phenomenological comparisons to standard NLO results and to Drell-Yan data. The progress reported here is an essential step towards showers with logarithmic accuracy beyond NLL for processes with incoming hadrons
TBPS Rings production
No full textTBPS stands for Tracker Barrel with Pixel-Strip (PS) modules. TBPS is part of the Outer Tracker for Phase2 Upgrade of the CMS experiment. Each TBPS Barrel layer has a “Flat” central section, where the PS modules are aligned parallel to the beam line, and two “Tilted” sections, where the sensors are slightly inclined towards the LHC beam interaction point. “Rings” are the key structural components of the Tilted TBPS. The mechanical design and construction of the TBPS Rings are done by CERN. Pictures from the ongoing TBPS Rings production (2024-2025)
Probing Hydrodynamics in PbPb Collisions at 5.02 TeV with Higher-order Cumulants
No full textThe elliptic flow of charged hadrons is studied through multiparticle correlations in PbPb collisions at √sNN = 5.02 TeV, corresponding to an integrated luminosity of 0.607 nb−1. v2 {2k} are measured up to the tenth order (k = 5) as functions of the collision centrality. They are shown to follow the ordering : v2{2} > v2{4} ≳ v2{6} ≳ v2{8} ≳ v2{10}. The centrality-dependent moments - skewness, kurtosis and, for the first time, superskewness, are measured for the fluctuation-driven event-by-event v2 distribution. These moments can be good probes of the initial-state geometry in high-energy nucleus-nucleus collisions, assuming a hydrodynamic expansion
CMS Upgrade Week 2025 - Visits to the Prevessin laboratories in France
No full textDuring the CMS Upgrade Week, this April, tours were organised for CMS collaborators to view and learn about the activities for the preparation of High-Lumi CMS