International Linear Collider
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Schematic map showing a possible location for the Future Circular Collider
No full textArtistic schematic map showing a possible location for the 90.7 km Future Circular Collider, 180 to 400 m depths for access shafts, 8 surface sites (7 in France, 1 in Switzerland
Catching Dense Spectra at Large Spin
No full textWe prove that in any unitary, modular-invariant 2d CFT with central charge c>1, a normalizable vacuum, and a twist gap in the spectrum of Virasoro primaries, there exists a continuous family of twist accumulation points above [the BTZ threshold]. We derive an asymptotic formula for the number of spin-J Virasoro primaries within a fixed twist window, as . This formula implies that the spectrum at large spin is Dense!!(Based on a joint work with Jiaxin Qiao and Balt van Rees)
(online talk, note the unusual time)</p
High energy probes of the initial stages
No full textWe study the momentum broadening of a high energy quark jet in the high-density gluon medium created right after the collision of two ultrarrelativistic heavy nuclei, the Glasma. Previous Glasma studies consider the jet as a classical probe particle, for which position and momentum are simultaneously determined. In this talk, we use the light-front QCD Hamiltonian formalism to treat the jet as a fully quantum state and compute its real-time evolution while propagating through the Glasma classical background fields, that appear as an interaction potential in the quantum evolution of the jet. We present results for the momentum broadening and jet quenching parameter, , experimented by a jet at mid-rapidity, paying special attention to the anisotropies in the momentum broadening between the longitudinal and transverse directions with respect to the collision axis. We enphasize the similarities and differences with the classical calculations that have been carried out so far
The FCC integrated programme: a physics manifesto
No full textThe FCC integrated programme comprises an high-luminosity circular collider that will produce very large samples of data in an energy range GeV, followed by a high-energy machine that, with the current baseline plan, will operate at a collision energy of around 85 TeV and deliver datasets an order of magnitude larger than those of the HL-LHC. This visionary project will allow for transformative measurements across a very broad range of topics, which in almost all cases will exceed in sensitivity the projections of any other proposed facility, and simultaneously provide the best possible opportunity for discovering physics beyond the Standard Model. The highlights of the physics programme are presented, together with discussion on the key attributes of the integrated project that enable the physics reach. It is noted that the baseline programme of FCC-ee, in particular, is both flexible and extendable, and also that the synergy and complementarity of the electron and proton machines, and the sharing of a common infrastructure, provides a remarkably efficient, timely and cost-effective approach to addressing the most pressing open questions in elementary particle physics
Upgrade of ATLAS Hadronic Tile Calorimeter for the High Luminosity LHC
No full textThe Tile Calorimeter (TileCal) is a sampling hadronic calorimeter covering the central region of the ATLAS experiment, with steel as absorber and plastic scintillators as active medium. The High-Luminosity phase of LHC, delivering five times the LHC nominal instantaneous luminosity, is expected to begin in 2029. TileCal will require new electronics to meet the requirements of a 1 MHz trigger, higher ambient radiation, and to ensure better performance under high pile-up conditions. Both the on- and off-detector TileCal electronics will be replaced during the shutdown of 2026-2028. PMT signals from every TileCal cell will be digitized and sent directly to the back-end electronics, where the signals are reconstructed, stored, and sent to the first level of trigger at a rate of 40 MHz. This will provide better precision of the calorimeter signals used by the trigger system and will allow the development of more complex trigger algorithms. The modular front-end electronics feature radiation-tolerant commercial off-the-shelf components and redundant design to minimise single points of failure. The timing, control and communication interface with the off-detector electronics is implemented with modern Field Programmable Gate Arrays (FPGAs) and high speed fibre optic links running up to 9.6 Gb/s. The TileCal upgrade program has included extensive R&D and test beam studies. A Demonstrator module with reverse compatibility with the existing system was inserted in ATLAS in August 2019 for testing in actual detector conditions. The ongoing developments for on- and off-detector systems, together with expected performance characteristics and results of test-beam campaigns with the electronics prototypes will be discussed
Model-independent measurement of the Higgs boson differential production cross section in association with two jets in the WW decay channel
No full textA model-independent measurement is presented of the differential production cross section of the Higgs boson decaying into a pair of W bosons, with a final state including two jets. The analysis selects events where the decay products of the two W bosons consist of an electron, a muon, and two neutrinos. The study is based on proton-proton collision data collected by the CMS detector from 2016 to 2018, corresponding to an integrated luminosity of . The production cross sections are measured as a function of the difference in azimuthal angle between the two jets. The differential cross section measurements are further used to constrain Higgs boson couplings within the SM effective field theory framework
Guidelines for FPGA Gateware Development in LHCb
No full textThis technical note outlines best practices and methodologies for FPGA development, with a focus on coding standards, verification techniques, and reusable design components tailored for LHCb gateware community. It introduces coding guidelines to ensure consistency, readability, and maintainability in FPGA designs, followed by an exploration of simulation methods and formal verification techniques to guarantee functional correctness and comprehensive coverage. The library is presented as a standardized collection of reusable components, enabling portability and reliability across diverse applications. Additionally, the integration of testbenches into Continuous Integration pipelines is discussed, providing automated testing and feedback to maintain code quality throughout the development lifecycle. By combining these approaches, the technical note aims to establish a robust framework for efficient and reliable FPGA development, fostering collaboration and innovation within the LHCb community
