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Physics with high-luminosity proton-nucleus collisions at the LHC
No full textThe physics case for the operation of high-luminosity proton-nucleus () collisions during Run 3 and 4 at the LHC is reviewed. The collection of (1-10 pb) of proton-lead (Pb) collisions at the LHC will provide unique physics opportunities in a broad range of topics including proton and nuclear parton distribution functions (PDFs and nPDFs), generalised parton distributions (GPDs), transverse momentum dependent PDFs (TMDs), low- QCD and parton saturation, hadron spectroscopy, baseline studies for quark-gluon plasma and parton collectivity, double and triple parton scatterings (DPS/TPS), photon-photon collisions, and physics beyond the Standard Model (BSM); which are not otherwise as clearly accessible by exploiting data from any other colliding system at the LHC. This report summarises the accelerator aspects of high-luminosity operation at the LHC, as well as each of the physics topics outlined above, including the relevant experimental measurements that motivate -- much -- larger datasets
Super Quantum!
No full textIntroduction à la Mécanique Quantique : Géraldine Haack (Université de Genève) avec des illustrations de Laurent Schafer ('Quantix'). Technologies Quantiques : Sofia Vallecorsa (CERN) présente les technologies en développement et les opportunités de formation. Culture Populaire et Quantique : Loïc Mougel explore les interprétations de la mécanique quantique dans les films Marvel, avec l'aide de Géraldine Haack et Sofia Vallecorsa
HALHF: a hybrid, asymmetric, linear Higgs factory using plasma- and RF-based acceleration. Backup Document
No full textThis document expands on the Comprehensive Summary submitted to the EPPSU 2026. It contains details on aspects of the HALHF project that could not be fitted into the Summary. Some sections contain work that is still preliminary and/or status reports on current progress
Davos Communications Award 2025
No full textAt the Davos Communications Summit held from 9 to 11 April 2025, CERN’s communication efforts were recognised with two prestigious Davos Communications Awards. As part of companies and organisations, CERN won the award in for In-house Team of the Year for their work on CERN's golden year of its 70th anniversary, while CERN alumna Chetna Krishna was honoured as a PR Rising Star in the individual category for her contributions to science communication. These awards celebrate the team’s creativity, global impact, and commitment to excellence in public engagement
Observation of coherent meson photoproduction in ultraperipheral PbPb collisions at 5.36 TeV
No full textThe first observation of coherent meson photoproduction off heavy nuclei is presented using ultraperipheral lead-lead collisions at a center-of-mass energy per nucleon pair of 5.36 TeV. The data were collected by the CMS experiment and correspond to an integrated luminosity of 1.68 b. The meson signals are reconstructed via the decay channel. The production cross section is presented as a function of the meson rapidity in the range 0.3 1.0, probing gluons that carry a fraction of the nucleon momentum () around . The observed cross section exhibits little dependence on rapidity and is significantly suppressed, by a factor of 5, compared to a baseline model that treats a nucleus as a collection of free nucleons. Theoretical models that incorporate either nuclear shadowing or gluon saturation predict suppression of the meson cross section with only a small dependence on rapidity, but the magnitude of the predicted suppression varies greatly. Models considering only nuclear shadowing effects result in the best agreement with the experimental data. This study establishes a powerful new tool for exploring nuclear effects and nuclear gluonic structure in the small- regime at a unique energy scale bridging the perturbative and nonperturbative quantum chromodynamics domains
Irradiation Study Using QA Test Pieces of ATLAS18 ITk Strip Sensors with 80MeV Protons
No full textThe ATLAS experiment is planning a complete replacement of its inner detector(ID) with a new all-silicon inner tracker (ITk) for the ATLAS Phase-2 upgrade. The ATLAS18 silicon strip sensors are designed to operate up to the integrated luminosity of 4000 fb, which corresponds to the maximum fluence of (including safety factor). To enhance the quality assurance (QA) program to monitor the key properties of the sensors, the strip sensor community is considering to include China Spallation Neutron Source (CSNS) as a proton irradiation site and Institute of High Energy Physics (IHEP) as a QA test site. A total of 18 ATLAS18 ITk QA test pieces were irradiated with , , and protons at CSNS, and measured at IHEP, including IV (leakage current-voltage), CV (capacitance-voltage) and CCE (charge collection efficiency) measurements. The upgraded irradiation setup at CSNS and measurement setup at IHEP are shown in this paper. Irradiated samples were exchanged between IHEP, Ljubljana and Birmingham to cross-check CCE measurements
Nucleon axial, tensor, and scalar charges and -terms from lattice QCD
No full textWe determine the nucleon axial, scalar and tensor charges at the continuum limit by analyzing three twisted mass fermion ensembles with all quark masses tuned to approximately their physical values. We include all contributions from valence and sea quarks. We use the Akaike Information Criterion to evaluate systematic errors due to excited states and the continuum extrapolation. For the nucleon isovector axial charge we find , in agreement with the experimental value. We compute the axial, tensor and scalar charges for each quark flavor. The axial charge provides crucial information on the intrinsic spin carried by quark in the nucleon and the the latter two provide input for experimental searches of physics beyond the standard model. Moreover, we extract the nucleon -terms and find MeV, for the strange MeV and for the charm MeV. We also present preliminary results on the isovector quantities using a fourth ensemble at smaller lattice spacing.We determine the nucleon axial, scalar and tensor charges at the continuum limit by analyzing three twisted mass fermion ensembles with all quark masses tuned to approximately their physical values. We include all contributions from valence and sea quarks. We use the Akaike Information Criterion to evaluate systematic errors due to excited states and the continuum extrapolation. For the nucleon isovector axial charge we find , in agreement with the experimental value. We compute the axial, tensor and scalar charges for each quark flavor. The axial charge provides crucial information on the intrinsic spin carried by quark in the nucleon and the the latter two provide input for experimental searches of physics beyond the standard model. Moreover, we extract the nucleon -terms and find MeV, for the strange MeV and for the charm MeV. We also present preliminary results on the isovector quantities using a fourth ensemble at smaller lattice spacing
The NA60+ experiment at the CERN SPS
No full textNA60+ is a new experiment designed to study the phase diagram of the strongly interacting matter at high baryochemical potential from 200 to 550 MeV at the CERN SPS. It is focused on precision studies of thermal dimuons, heavy quark and strangeness production in Pb–Pb collisions at center of mass energies ranging from 6 to 17 GeV. This contribution is focussing on the experimental apparatus, including the technical aspects and the R&D; status, as well as the physics program and its competitiveness and complementarity to other experiments
International Conference on Exotic Atoms and Related Topics and Conference on Low Energy Antiprotons (EXA/LEAP 2024)
No full textWelcome session for newcomers
No full textGroup photo in the Globe of Science and Innovation of all staff starting to work at CERN on 6 January 2025