• Charge-Parity (CP) violation in the charm sector only observed in 2019 by measuring $\Delta ACP = ACP (D^0 \to K^+ K^−) − ACP (D^0 \to \pi^+ \pi^−) $[1]. • Following measurement points to evidence in the $D^0 \to \pi^+ \pi^− $ channel [2]. • Standard Model(SM) or not? Theoretical interpretation debated [3]. • More measurements needed to clarify the physics picture. The $D^0 \to \pi^+ \pi^− \pi^0$ channel is a good candidate for such studies, as it proceeds via similar EW contributions to $D^0 \to \pi^+ \pi^− $but provides a non-trivial phase-space where a local increase in CP violation is possible.

The LHCb experiment searches for low-mass dilepton resonances that could be due to mediators between the Standard Model and a hypothesized dark sector, which interacts feebly through kinetic mixing. Results from Run 2, focusing on prompt and displaced dimuon decays, have set world-leading exclusion limits on masses down to the dimuon kinematic threshold. This poster presents prospects to search for dilepton resonances below 100 MeV with the Upgraded LHCb detector using excited D meson decays to a D meson and a dielectron pair. We exploit the upgraded detector’s capabilities to detect displaced D meson decays at the first trigger level and to reconstruct soft electrons to collect a large number of these decays, several orders of magnitude larger than previous experiments. Ongoing efforts, based on 2024 data, aim to use this unique dataset to test dark photon models as well as protophobic models that could explain the X17 anomaly observed in ATOMKI experiments.

Heavy Neutral Leptons (HNLs) are hypothetical long-lived particles that extend the Standard Model (SM) and provide a natural explanation for the non-zero neutrino masses. In addition, they could play a key role in addressing some of the most profound open questions in particle physics and cosmology, including the origin of the matter–antimatter asymmetry via baryogenesis. In this poster, we present the status and state-of-the-art of HNL searches at the LHCb experiment. We report the latest and most stringent LHCb limits on muon-coupled HNLs in the 1.6–5 GeV mass range, obtained from a Run 2 (2016–2018) analysis targeting displaced vertices corresponding to HNL flight distances of 0.02–0.5 m. Looking ahead, for Run 3 we introduce a novel reconstruction technique that exploits track segments downstream of the LHCb magnet, thereby extending the accessible displacement window to 0.5–8.0 m. This approach enhances sensitivity dramatically, providing a 40-fold increase in the number of accessible HNL events and extending the lifetime reach by a factor of 16 compared to the Run 2 analysis. A dedicated sensitivity study shows how these improvements translate into a significantly extended reach in the HNL mass–coupling parameter space, positioning LHCb to set world-leading constraints on HNLs.

The Tracker Barrel with PS-modules (TBPS) is one of the subdetectors of the new CMS Phase-2 Tracker. It will have 2872 Pixel-Strip (PS) modules on three concentric layers. Each layer has three sections, one Flat section in the middle surrounded by two Tilted sections. In the Flat section the modules are on straight Planks while in the Tilted section they are on conical Rings. A particular difficulty is the routing of the cooling, electrical and optical services of the TBPS. The services need to fit in small spaces, be compatible with the detector assembly sequence and be constrained reliably. Services routing and supporting have been designed to fulfil these requirements, still keeping the mass as low as possible.

This collection features 11 visually engaging posters tracing CERN’s evolution — from its pioneering discoveries and groundbreaking technologies to the vision of the Future Circular Collider (FCC), an international endeavour designed to extend our quest for knowledge into the post-LHC era. Together, these posters highlight CERN’s enduring role at the forefront of global scientific exploration.Cette collection comprend 11 posters visuellement captivantes retraçant l’évolution du CERN — de ses découvertes pionnières et de ses technologies novatrices jusqu’à la vision du projet "Future Circular Collider" (FCC). Cette initiative internationale est conçue pour prolonger notre quête de connaissance dans l’ère post-LHC. Cet ensemble de posters mettent en lumière le rôle durable du CERN à l’avant-garde de l’exploration scientifique mondiale.

The scientific purpose of this experiment, conducted in August 2025, was to identify fracture limits of pre-cracked tungsten and titanium materials, validate simulations predicting pulsed-beam induced damage in ceramic nanofiber samples under atmospheric and vacuum conditions, and understand failure mechanisms, limitations, and flow behavior of various material specimens. The experimental set-up comprised of multiple arrays of specimens, each exposed to different beam intensities. A total of 72 samples were tested including conventional materials (graphite, and titanium alloys) and novel materials (Toughened Fine-Grained Recrystallized (TFGR) Tungsten, electrospun nanofiber materials (ZrO2, W), SiC, Pure W, and high-entropy alloys) pertinent to accelerator beam windows and secondary particle production targets.

Search for the charmless baryonic decay B+→Λ¯pp¯p is performed using proton-proton collision data recorded by the LHCb experiment, corresponding to an integrated luminosity of 5.4fb−1. The branching fraction is measured to be B(B+→Λ¯pp¯p)=(2.08±0.34±0.10±0.26)×10−7, where the first uncertainty is statistical, the second is systematic, and the third arises from the normalization channel. The CP asymmetry is measured to be ACP=(5.4±15.6±2.4)%, where the uncertainties are statistical and systematic. The background-subtracted invariant mass distributions of baryon-antibaryon pairs exhibit pronounced enhancements at both kinematic thresholds.

CERN technologies: from fundamental research to our everyday lives. Since 1954, the world-class research performed at CERN helps uncover what the universe is made of and how it works: here, scientists from all over the world study elementary particles – invisible to the eye – through complex and often gigantic instruments.

CERN technologies: from fundamental research to our everyday lives. Since 1954, the world-class research performed at CERN helps uncover what the universe is made of and how it works: here, scientists from all over the world study elementary particles – invisible to the eye – through complex and often gigantic instruments.

At CERN, we probe the fundamental structure of particles that make up everything around us. We do so using the world’s largest and most complex scientific instruments. This visual exhibition focuses mainly on photos, offers visitors the opportunity to explore CERN through 18 posters.