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Exploring strangeness enhancement in proton-proton collisions at the LHC with event shapes
No full textStudy of the radiation background and of new monitoring tools at the LHC for Run 3 and the HL-LHC
No full textThe hostile radiation environment at the Large Hadron Collider (LHC) affects detectors, accelerator beamline elements and electronic devices, requiring the careful characterisation of the radiation levels. This thesis aims to study the mixed radiation field at the LHC and its upgrade, the High Luminosity LHC, by developing a simulation model and a new radiation monitor
CMS Offline Software and Computing input to the European Strategy for Particle Physics - 2026 update
No full textThis document outlines the CMS Offline Software and Computing strategy in preparation for the High-Luminosity LHC (HL-LHC) era and serves as input to the 2026 update of the European Strategy for Particle Physics. As CMS faces a significant increase in data volume, event complexity, and computing demands in Phase-2, this report details the necessary evolution of software, computing models, infrastructure, and sustainability practices. Key developments include optimizing the CMSSW framework for heterogeneous architectures, expanding the use of AI/ML in simulation and reconstruction, adopting container-based analysis environments, and improving storage efficiency through hybrid models. The document emphasizes collaborative development across the HEP community, the need for sustainable computing aligned with environmental goals, and securing long-term resource commitments, especially from HPC centers, to ensure the success of CMSs scientific program and its broader impact on future experiments
CERN Tape Archive Workshop : CTA 2025
No full textCTA was designed with two goals in mind: throughput to and from the tape system and minimising the stress on the tape infrastructure (minimising the number of tape mounts). These two constraints become particularly challenging in retrieval dataflows when elements external to the system start to misbehave.
In this presentation, we will explore the internal logic behind CTA’s retrieval workflow, the mechanisms that come into action when the system starts to experience problems, and the various approaches we have taken to address these challenges
Search for violation in events with top quarks and Z bosons
No full textA search for the violation of the charge-parity () symmetry in the production of top quarks in association with Z bosons is presented, using events with three charged leptons and additional jets. For the first time in this final state, observables that are odd under the transformation are employed. Also for the first time, physics-informed machine learning techniques are used to construct these observables. While standard model (SM) processes are predicted to be symmetrically distributed around zero on these observables, -violating modifications of the SM would introduce asymmetries. Two -odd operators and in the SM effective field theory are considered that may modify the interactions between top quarks and electroweak bosons. The search is performed in a sample of proton-proton collision data collected by the CMS experiment at the CERN LHC in 2016-2018 at a center-of-mass energy of and in 2022 at , corresponding to a total integrated luminosity of . The obtained results are consistent with the SM prediction within two standard deviations, and exclusion limits of and are set at confidence level
Updated projections for measurements with the ATLAS detector at the HL-LHC
No full textUpdated estimates are presented for the expected precision of measurements of the branching fractions of the rare decays of and with the ATLAS detector at the HL-LHC. Projections for the effective lifetime of are also provided for the first time. The projections are based upon existing analyses of proton-proton collision data collected by the ATLAS experiment between 2015 and 2016. Statistical and systematic uncertainty estimates are presented assuming an integrated luminosity of for different prospective HL-LHC trigger working points
Searches in the BSM Higgs Sector
No full textThe discovery of the Higgs boson with the mass of about 125 GeV completed the particle content predicted by the Standard Model. Even though this model is well established and consistent with many measurements, it is not capable of explaining some observations by itself. Many extensions of the Standard Model addressing such shortcomings introduce additional Higgs bosons, beyond-the-Standard-Model couplings to the Higgs boson, or new particles decaying into Higgs bosons. In this talk, the latest searches in the Higgs sector by the ATLAS and CMS experiments are reported, with emphasis on the results obtained with the full LHC Run 2 dataset at 13 TeV
Search for the decay of the Higgs boson to charm quarks in p-p collisions at TeV in the LHC-ATLAS experiment
No full textThis thesis describes the latest search on the Higgs boson decay to a charm and anti-charm quark pair (), where the Higgs boson is produced in association with a vector boson. The associated production of a Higgs boson with a vector boson gives the best sensitivity to probe the Higgs-charm coupling strength, since the leptonic decay of the vector bosons can be used to trigger this process. The search is based on the full proton-proton collision dataset recorded by the ATLAS experiment from 2015 to 2018. The analysis utilizes a new jet-flavor tagging algorithm and new analysis techniques to increase the signal sensitivity compared to the previous search by the ATLAS experiment. The new analysis techniques include a multivariate analysis to discriminate signal and background events, and an event weighting method to effectively use all the simulated events, which helps in reducing the statistical error attributed to simulated samples. In the new analysis, an observed (expected) upper limit at 95\% confidence level of 12 (11) times the standard model prediction on the signal strength is obtained. The expected upper limit is a factor of three times improvement compared to the previous ATLAS result
CERN Tape Archive Workshop : CTA 2025
No full textCTA software development is primarily driven by the needs of the CERN experimental programme. Looking beyond Run-3, data rates are set to continue to rise exponentially into Run-4 and beyond. The CTA team are planning how to scale the software and service to meet these new challenges.
CTA is also driven by the needs of the community outside CERN. The landscape of tape archival for scientific data is consolidating, and CTA is constantly adapting to a wider range of use cases.
This talk will present the short-term and medium-term roadmap for CTA development and new features
