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 20 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 20 posters.

HRMT-60 - RaDIATE Material Studies Nicht eingeplant 3h CERN Poster Cocktail - Poster session Beschreibung HRMT-60 experiment was performed at the CERN-HiRadMat facility in October 2022 to understand thermal shock response of conventional materials and novel materials to support the design and operation of future multi-MW accelerator beam windows and secondary particle-production targets. This experiment, organized within the framework of the RaDIATE collaboration, builds on the previous HRMT-43 (BeGrid2) experiment, where a variety of materials in both non-irradiated and previously proton-irradiated conditions were tested. The primary goal was to understand the failure mechanisms, limits and flow behavior of the various material specimens, as well as compare and contrast the thermal shock response of previously irradiated materials to their non-irradiated counterparts. A total of 120 samples were tested at different beam conditions. This poster will present the preliminary results of several materials tested during this experiments.

In the SPS, reliable monitoring of the transverse beam position across the wide range of different beam structures and intensities is essential for the stable and efficient operation of the complex system of machines, facilities and experiments that receive beam. The current calibration method of the Beam Position Monitors (BPMs), using polynomial fit, suffers from systematic errors in the position measurements, which increase significantly for off-centered beams. These errors can lead to reduced control of the extraction angle and compromise the stability of the delivered beam in facilities like HiRadMat. The goal of this study is to develop a machine learning-based calibration method that will allow us to more accurately map the response of the BPM electronics, minimize the systematic errors and improve the precision of beam position measurements, and thus the beam delivery reproducibility, while containing algorithm complexity, in the SPS complex, and beyond

The differences in hadron chemistry observed at e+e- machines versus hadron colliders may indicate that the mechanisms by which partons evolve into visible matter are not universal. In particular, the presence of many other quarks produced in the underlying event may affect the hadronization process. With full particle ID, precision vertexing, and a high rate DAQ, the LHCb experiment is uniquely well suited to study the hadronization of heavy quarks. New results will be discussed in this contribution, including progress on studies of charm baryon enhancement in collisions.

The LHCb experiment’s forward acceptance offers a unique opportunity to study bulk physics in heavy-ion collisions. Properties of bulk particle production, such as the average transverse momentum of charged particles, 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. In this contribution, new bulk physics measurements from the LHCb experiment will be presented.

The forward geometry and precision instrumentation of the LHCb spec- trometer provides unique insights into the production of heavy quarks at the LHC. Heavy quark production in pPb collisions are sensitive to the modification of nuclear parton distribution functions, energy loss in the nucleus, and the hadronization process, among other effects. In this talk, precision measurements of open charm production from a rich set of charmed hadrons in pPb collisions at 5.02 and 8.16 TeV will be presented, including new LHCb measurements of D mesons and Ξc baryons in pp and pPb collisions. Comparisons with theoretical models and related results will be discussed.

Bottomonium production is sensitive to both the structure of nucleons and the interactions of b quarks with the nuclear media produced in heavy-ion collisions. The LHCb detector’s forward geometry allows for studying bottomonium production in a unique kinematic regime. Recent LHCb studies of bottomonium production will be presented, including multiplicity-dependent measurements sensitive to final-state effects and multi-parton interactions in small collision systems.

Jet substructure measurements at the LHC produce precision tests of jet formation and fragmentation in vacuum as well as at the high temperatures and densities formed in heavy-ion collisions. Jets containing a heavy-flavor hadron drive these QCD measurements into a regime where parton mass and colour factors are critical, pushing the limits of theoretical calculations both in-vacuum and in-medium. Mapping out individual emissions in the Lund jet plane for heavy-flavour jets and comparing to light-quark-enriched jets tagged by a Z boson reveals significant mass-dependence to jet fragmentation, offering a decisive channel to decipher in-medium modification to jet fragmentation across different kinematics. At the same time, measuring heavy-flavour jet mass with a theoretically-safe flavour tagging algorithm for the first time tests perturbative QCD at unprecedented theoretical precision and probes the gluon splitting contribution to heavy-flavour production, a yet-unobserved probe of how the medium resolves quark entanglement. The LHCb collaboration presents recent jet substructure results at forward rapidity in collisions at centre-of-mass energy TeV. These measurements are compared to theoretical predictions, providing new insight on QCD fragmentation at forward rapidity and at low and moderate values of jet transverse momentum. These results provide a baseline for future measurements of jet quenching in PbPb collisions.