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Probing the polarisation of W and Z bosons helps explain how electroweak symmetry is broken and tests the Standard Model (SM) and new physics. A new method calculates polarised cross-sections with high precision, including QCD and electroweak corrections. Recent results cover SM predictions for ZZ and WZ production, and beyond-SM studies in the SMEFT framework. These advances improve LHC data analysis and the search for new physics.

The R2D2 collaboration is developing a radial time projection chamber with a fiducial mass of half a tonne of 136Xe at high pressure. This experiment aims to detect neutrinoless double beta decay, which would confirm neutrinos as Majorana particles. The goal is to achieve a tonne-scale, zero-background experiment. Simulations suggest it could set a half-life limit exceeding 10^27 years and constrain neutrino mass, potentially excluding the inverted mass hierarchy region.

The European Strategy for Particle Physics is focusing on developing an electron-positron collider, with plans to be detailed in the 2026 update. Proposed projects include CLIC, ILC, and FCC-ee. France is leading the FCC-SEED project to design an advanced vertex detector using thin Monolithic Active Pixel Sensors. This seminar will discuss the FCC-ee project’s goals, detector requirements, the FCC-SEED design, and progress on MIMOSIS chips.

The unprecedented precision of spatial data challenges our understanding of cosmic rays, stimulating debates on dark matter, the acceleration and transport of cosmic rays, and galactic sources. Interpretations are limited by uncertainties in nuclear cross-sections. A roadmap is proposed to address these issues through ongoing and future measurements.

Nicolas Copernicus proposed a heliocentric model in 1543, placing the Sun at the center of the universe, in contrast to Ptolemy’s geocentric model. This revolution is often oversimplified, obscuring the nuances of his proposal. A seminar by Richard Taillet explores this model in detail, including its challenges and the reactions it provoked.

This bilingual seminar aims to demystify Feynman diagrams for all LAPP/LAPTh staff. Firstwe will explore these essential tools of particle physics in an accessible way, using everyday analogies. The second part will be aimed at physicists focusing on the art of effectively communicating these concepts to a non-specialist audience.

The Standard Model (SM) has gaps, like the matter-antimatter imbalance, hinting at physics beyond the SM (BSM). Double-charm B meson decays are key to exploring this.
Recent LHCb findings, such as the unexpected evidence of Bc→Ds+D0bar decay or the first measurements of CPV and branching fractions of lighter B mesons decays, suggest possible BSM physics.

The future circular collider is the next big challenge in high-energy physics, aiming to explore the standard model with unprecedented precision and to search for new particles. The presentation will provide an overview of the current status of the project, focusing on the physic case of the initial phase with electron and positron collisions.