Light hadrons constitute the bulk of particle production in heavy-ion collisions. Its properties, such as the production cross-sections of different hadron species or their average transverse momentum, are sensitive to both collective phenomena and the initial state of heavy-ion collisions. Bulk physics measurements in small collision systems can reveal the interplay between initial- and final-state effects in heavy-ion collisions, and can provide new insights into the origins of collective phenomena. The LHCb detector, with its high-resolution tracking system and its hadron ID capabilities, is perfectly suited for these studies in the forward region. In this contribution, new results on bulk measurements in small systems will be presented.

The $\phi$ meson is a unique probe of strange quark dynamics in high-energy nuclear collisions. The $\phi$ meson's mass lies at the threshold between perturbative and nonperturbative QCD. Consequently, $\phi$ production provides sensitivity to both regimes. In heavy-ion collisions, $\phi$-meson production is senstive to strange-quark coalescence in quark-gluon plasma. The $\phi$ meson's net-zero strangeness means that $\phi$ production measurements can help disentangle the physical mechanisms behind strangeness enhancement in high-energy hadron and nucleaer collisions. The LHCb detector's hadron identification capabilities allow for precise studies of $\phi$ meson production in nuclear collisions. In addition, the SMOG system allows LHCb to study production in fixed-target collisions. New measurements of $\phi$ production in both collider and fixed-target configurations will be presented.

Ultra-peripheral collisions provide a unique environment to study pomeron- and photon-induced reactions with heavy nuclei. These interactions can produce a wide range of final state particles, from light vector mesons to heavy quarkonia, and probe potentially exotic phenomena. With a fast and flexible DAQ, full particle ID, and the ability to reconstruct very low pt particles, LHCb is uniquely well suited to study final states with leptons, hadrons or photons. Also, using the HeRSCheL detector, the far forward event activity can be detected and used to tag events with nuclear break-up. In this contribution, we will present recent LHCb results from ultra-peripheral heavy ion collisions and discuss how these impact our understanding new exotic phenomena, the partonic structure of nuclei and hadronization in small systems.

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.

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.

Représentation des infrastructures souterraines du FCC, conçue pour la vulgarisation technique et scientifique auprès du grand public (non à l’échelle).

The Faces of CERN: People Advancing Science. At the heart of CERN, curiosity guides scientific research and brings together a myriad of unexpectedly diverse professions: physicists, engineers, computer scientists, but also communications specialists, lawyers, accountants, administrators, and security experts, to name just a few. Together, they push the boundaries of our knowledge by operating complex machines and data systems and conducting cutting-edge research. CERN thus acts as a true talent accelerator, preparing the science of tomorrow.Les visages du CERN : les personnes qui font avancer la science. Au cœur du CERN, la curiosité guide la recherche scientifique et réunit des métiers d’une richesse insoupçonnée : physiciens, ingénieurs, informaticiens, mais aussi communicants, juristes, comptables, administrateurs ou spécialistes de la sécurité, pour ne citer que quelques exemples. Ensemble, ils repoussent les limites de nos connaissances en faisant fonctionner des machines et des systèmes de données complexes et en menant des recherches de pointe. Le CERN agit ainsi comme un véritable accélérateur de talents, préparant la science de demain.

The Faces of CERN: People Advancing Science. Immerse yourself in this network, where each thread tells a story of curious collaboration and showcases your talents.Les visages du CERN : les personnes qui font avancer la science. Plonger dans cet univers, où chaque fil raconte une histoire de curiosité et de collaboration, et met en scène vos talents.

CERN has always been ahead of its time. In this selection of photos dating from the 1950s to the 1980s, the machines look outdated, and yet they were at the cutting edge of technology in their day. Beyond the machines, these images give us a glimpse of the extraordinary human endeavour that is CERN, where scientific exploration melds with passion, a spirit of sharing and, sometimes, a touch of humour.Hier déjà, le CERN c’était le futur. Sur cette sélection de photos des années 1950 à 1980, les machines semblent désuètes. Elles étaient pourtant à la pointe de la technologie. Au-delà des machines, ces images racontent un morceau de la formidable aventure humaine du CERN, où l’exploration scientifique se conjugue avec la passion, l’esprit de partage et, parfois, une touche d’humour.

A detailed study exploiting novel trigger and reconstruction techniques developed to search for Beyond Standard Model (BSM) Long-Lived Particles (LLPs) with very displaced vertices is presented. Building on feasibility studies that have successfully reconstructed Standard Model decays occurring up to 8m forward of the interaction point in LHCb’s magnet region, the search for LLP particles into charged final states exploits LHCb’s unique forward geometry and segmented tracking system—comprising the Vertex Locator, Upstream Tracker, and SciFi stations—to extend sensitivity into previously inaccessible regions. The proceeding will cover innovative trigger strategies implemented in LHCb’s software trigger for inclusively selecting very displaced dimuon pairs, alongside advanced offline selection methods using multivariate analysis methods to robustly suppress background while maintaining high signal efficiency. Preliminary sensitivity estimates for Dark Higgs 𝐻′ → 𝜇+𝜇− search indicate that these approaches can achieve competitive performance compared to dedicated LLP experiments. Future prospects will also be discussed. This work aims to provide a comprehensive framework for enhancing LLP discovery potential at LHCb and offers insights that could be beneficial for the broader BSM LLP search community.