International Linear Collider
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The Large Hadron electron Collider as a bridge project for CERN
No full textThe LHeC is the project for delivering electron-nucleon collisions at CERN using the HL-LHC beams. An Energy Recovery Linac in racetrack configuration will provide 50 GeV electrons to achieve centre-of-mass energies around 1 TeV/nucleon and instantaneous luminosities around cms. The LHeC program elaborated in the CDR of 2021 included a phase with concurrent operation of electron-hadron and hadron-hadron collisions, followed by a standalone phase of electron-hadron collisions only. In view of the current HL-LHC schedule, in this paper we have examined the possibilities of a program after the regular HL-LHC program with only electron-proton operation. In this operation mode, the LHeC would serve as an impactful bridge project between major colliders at CERN. The standalone physics program comprises electroweak, Higgs, top-quark, BSM and strong-interaction physics. In addition, it empowers the physics analyses at the HL-LHC by retrofitting measurements and searches with significantly more precise knowledge of the proton structure and . The accelerator technology deployed in the Energy Recovery Linac for the LHeC is a major stepping-stone for the performance, cost reduction and training for future colliders. The capital investments in the LHeC electron accelerator can be reused in a cost-efficient way as the injector for the FCC-ee. Finally, data from the LHeC are essential to enable the physics potential of any new high-energy hadron collider. The operational plan of 6 years easily fits in the period between two major colliders at CERN. Similar to the LHeC empowering the HL-LHC physics program, the FCC-eh would be an impactful addition to the FCC physics program
Design and performance of the calorimeter system for ALLEGRO FCC-ee detector concept
No full textThe future circular electron-positron collider (FCC-ee) will be a unique precision instrument designed to o↵er great direct and indirect sensitivity to new physics. Its primary purpose will be to study the heaviest known particles (Z, W, and H bosons and the top quark) with unprecedented precision, a goal that introduces multiple challenges in the detector design. Key requirements for the detector include excellent energy and angular resolution coupled with strong particle identification capabilities. One of the proposed experiments for FCC-ee is ALLEGRO, a general-purpose detector concept that is currently in its design and optimization phase. This contribution aims to introduce ALLEGRO’s calorimeter system, o↵ering a comprehensive overview of the baseline technologies planned for its two calorimeter systems: a highly granular noble-liquid electromag-netic calorimeter and a hadronic calorimeter with scintillating-light readout using wavelength shifting fibers. To assess the calorimeters’ performance, test di↵erent detector geometries, and fine-tune reconstruction algorithms such as topological clustering, we employ Monte Carlo simulations of single particles. Preliminary results from performance studies with the standalone hadronic calorimeter and combined calorimeters are presented, thus shedding light on the promising capabilities of this newly introduced detector concept for FCC-ee. In addition to these design-focused analyses, we briefly introduce our inquiries into the potential use of machine-learning approaches for particle identification and detector calibration
Restricted Council - Two-Hundred-and-Twenty-First Session
No full textRestricted Council - Two-Hundred-and-Twenty-First Sessio
HL-LHC projections for single Higgs boson measurements at the CMS experiment
No full textThis note describes HL-LHC projection studies based on the Run 2 CMS measurements in the and decay channels. The expected constraints are extracted for integrated luminosities of 2000 and 3000 fb. All cross sections are scaled to the standard model predicted values at ~=~14~TeV. The systematic uncertainties are adapted to account for the theoretical and experimental improvements which are foreseen for the HL-LHC era
Prototyping at CERN micro-conference (Mar. 2025)
No full textTo kick off this year’s Prototyping at CERN series, people gathered at IdeaSquare to join a community of innovators showcasing and sharing prototypes related to their work. Last editions’ sessions sparked great exchanges, and we’re excited to continue building this growing network of people prototyping at CERN. The session featured 5-minute pitches of prototypes developed at IdeaSquare and elsewhere at CERN. The goal of this event is to share knowledge, foster new collaborations, and support one another in tackling challenges. Whether you're actively working on a prototype or just curious to learn about what’s happening, this is a great opportunity to connect and get inspired
Search for dark matter production in association with a single top quark in proton-proton collisions at 13 TeV
No full textA search for the production of a single top quark in association with invisible particles is performed using proton-proton collision data collected with the CMS detector at the LHC at 13 TeV, corresponding to an integrated luminosity of 138 fb. In this search, a flavor-changing neutral current produces a single top quark or antiquark and an invisible state nonresonantly. The invisible state consists of a hypothetical spin-1 particle acting as a new mediator and decaying to two spin-1/2 dark matter candidates. The analysis searches for events in which the top quark or antiquark decays hadronically. No significant excess of events compatible with that signature is observed. Exclusion limits at 95% confidence level are placed on the masses of the spin-1 mediator and the dark matter candidates, and are compared to constraints from the dark matter relic density measurements. In a vector (axial-vector) coupling scenario, masses of the spin-1 mediator are excluded up to 1.85 (1.85) TeV with an expectation of 2.0 (2.0) TeV, whereas masses of the dark matter candidates are excluded up to 0.75 (0.55) TeV with an expectation of 0.85 (0.65) TeV.A search for the production of a single top quark in association with invisible particles is performed using proton-proton collision data collected with the CMS detector at the LHC at = 13 TeV, corresponding to an integrated luminosity of 138 fb. In this search, a flavor-changing neutral current produces a single top quark or antiquark and an invisible state nonresonantly. The invisible state consists of a hypothetical spin-1 particle acting as a new mediator and decaying to two spin-1/2 dark matter candidates. The analysis searches for events in which the top quark or antiquark decays hadronically. No significant excess of events compatible with that signature is observed. Exclusion limits at 95% confidence level are placed on the masses of the spin-1 mediator and the dark matter candidates, and are compared to constraints from the dark matter relic density measurements. In a vector (axial-vector) coupling scenario, masses of the spin-1 mediator are excluded up to 1.85 (1.85) TeV with an expectation of 2.0 (2.0) TeV, whereas masses of the dark matter candidates are excluded up to 0.75 (0.55) TeV with an expectation of 0.85 (0.65) TeV
Performance and Calibration of the ATLAS Tile Calorimeter
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 scintillators are read-out by the wavelength shifting fibres coupled to the photomultiplier tubes (PMTs). The analogue signals from the PMTs are amplified, shaped, digitized by sampling the signal every 25 ns and stored on detector until a trigger decision is received. The TileCal front-end electronics reads out the signals produced by about 10000 channels measuring energies ranging from about 30 MeV to about 2 TeV. Each stage of the signal production from scintillation light to the signal reconstruction is monitored and calibrated. During LHC Run-2, high-momentum isolated muons have been used to study and validate the electromagnetic scale, while hadronic response has been probed with isolated hadrons. The calorimeter time resolution has been studied with multi-jet events. First results using early LHC Run-3 data will be shown. A summary of the performance results, including the calibration, stability, absolute energy scale, uniformity and time resolution, will be presented
ATLAS ITk Pixel Detector Overview
No full textIn the high-luminosity era of the Large Hadron Collider (HL-LHC), the instantaneous luminosity will reach unprecedented levels, with up to 200 proton-proton interactions per bunch crossing. To address the challenges posed by this environment, the ATLAS Inner Detector will be replaced with the all-silicon Inner Tracker (ITk). The innermost section of the ITk will feature a pixel detector comprising approximately 10,000 modules, covering a total active area of 13 m. To meet the evolving demands for radiation hardness, power dissipation, and production yield, the five barrel and endcap layers will incorporate several new technologies. The project is currently transitioning from pre-production to full-scale production, involving the fabrication of components, modules, mechanical structures, and services. This contribution provides an overview of the current status of the ITk pixel detecto