Transverse $\Lambda$ polarization observed over four decades ago contradicted expectations from early leading-order perturbative QCD calculations. Measurements of $\Lambda$ polarization from unpolarized $pp$ and $p$A collisions have been previously observed to increase as a function of xF and pT up to a few GeV range and approximately independent of beam energy. Recent studies have linked polarization to the process of hadronization, which describes how particular hadrons are formed from scattered quarks and gluons. The high energy of the LHC and the coverage and precision measurement possibilities from LHCb forward geometry are ideal for studying hyperon polarization as a function of both $p_T$ and $x_F$ . The status and prospects of $\Lambda$ and $\Lambda$ polarization measurements in $pp$, $p$Pb, Pb$p$, and fixed-target $p$Ne collisions at LHCb are presented

Investigating particle production in small systems has become instrumental in probing non-perturbative contributions to hadron structure and hadronization mechanisms. The LHCb spectrometer unique geometry at the LHC along with its particle identification and tracking capabilities allow for new studies of the multiplicity-dependent enhancement of strange hadrons in the forward region. Aggregating results of this kind will provide insight into how collective effects modify hadronization, even in proton-proton collisions. In this contribution, recent and upcoming measurements from the LHCb collaboration regarding the relative production rates of strange hadrons as well as how they are modified by event activity will be discussed

Antimatter in cosmic rays is a powerful probe for Dark Matter indirect detection. To constrain the background from secondary antiparticles, produced during cosmic ray propagation through the interstellar medium, the related cross sections need to be precisely determined at accelerator facilities. In particular, being their secondary production suppressed at low energies with respect to DM signal predictions, light anti-nuclei like anti-deuterium and anti-helium are smoking guns for exotic sources. The LHCb experiment currently offers a unique fixed-target facility exploiting the beam energy provided by LHC and can reproduce cosmic collisions between protons at the TeV scale and gas targets of helium. In this poster, we will present the implementation of a new particle identification technique optimized for heavy particles like light nuclei, based on a time-of-flight measurement in the LHCb Outer Tracker detector, with a focus on the first performance results obtained on data. Applications in future analyses will also be discussed.

Owing to its spectrometer acceptance, which is complementary to the other LHC experiments, LHCb is collecting several fixed-target and ion collision samples, providing unique inputs to theoretical models in poorly explored kinematic regions. In this contribution, the impact of the ongoing and foreseen upgrades of the LHCb experiment on the ions and fixed-target physics programme are discussed, notably including the installation of tracking station inside the magnet and the replacement of some tracker detectors to avoid saturation in central lead-lead collisions.

The High-Luminosity Large Hadron Collider (HL-LHC) upgrade will boost the data collection capacity of LHC experiments, leading to more precise measurements of Standard Model (SM) phenomena. By studying the trilinear Higgs self-coupling and di-Higgs production, HL-LHC aims to constrain the Higgs potential. However, this update presents challenges, necessitating upgrades to detector components due to increased pile-up. The Inner Detector will be replaced with the Inner Tracker (ITk) which will benefits searches for di-Higgs, such as the ttHH production. The HL-LHC environment predicts up to 200 proton-proton collisions in one bunch crossing, demanding efficient track reconstruction methods. The ATLAS collaboration explores software optimisations, including the adoption of the Common Tracking Software toolkit (ACTS) to profit from thread-safe and high-performing software with good maintainability and flexibility

The high cost of prototyping at advanced technology nodes, as well as the complexity of future detectors, necessitate the use of a system design technique widely used in industry: design space exploration through high-level architecture studies to establish precise and optimal requirements. This work presents Pix-ESL: a programmable SystemC framework for simulating the readout chain from the front-end chips to the detector back-end. The model is transaction accurate, comprises an event generator and connects with real-world physics events, and provides metrics such as readout efficiency, latency, and average queue occupancy. This contribution outlines the framework's structure as well as a case study based on Velopix2.

Decays of beauty hadrons to charmless final sates receive relevant contributions from penguin topologies where new physics beyond the Standard Model may appear as virtual contributions. The presence of these new particles can be revealed comparing the branching fractions and CP asymmetries of these decays with the Standard Model expectations. In addition, the combination of several quantities and the study of the decay dynamic over the phase space of multibody decays allow the models used to deal with QCD effects to be validated. In this presentation the most recent analyses of charmless b-hadron decays performed by LHCb are presented.

The Time Of internally Reflected CHerenkov detector (TORCH) is a proposed large-area time-of-flight detector, designed to enhance the particle identification performance of the Upgrade-II LHCb experiment in the 2–15 GeV/c momentum range. A TORCH module consists of a 10 mm thick quartz plate of dimensions 2.5 x 0.66 m from which the positions and arrival times of Cherenkov photons from a charged track are detected by highly segmented MCP-PMTs. Each MCP-PMT has an active area of 53 x 53 mm and a granularity of 64 x 8 pixels, and developed in collaboration with an industrial partner (Photek). A general overview of TORCH and its operating principles will be reviewed along with recent results from a half-length 1.25 m TORCH prototype module tested at the CERN proton synchrotron. In the most recent beam test in November 2022, the prototype module was instrumented with 6 MCP-PMTs compared to 2 MCP-PMTs in previous tests. The current status of the analysis of the latest data will be presented.

Measurements of quarkonia production in peripheral and ultra-peripheral heavy-ion collisions are sensitive to photon-photon and photon-nucleus interactions, the partonic structure of nuclei, and to the mechanisms of vector-meson production. In this contribution, recent measurement performed by LHCb will be presented, such as the coherent and incoherent production of $J/\psi$ mesons in peripheral and ultra-peripheral collisions in PbPb at forward rapidity with the highest precision currently accessible. Prospects for future UPC measurements with the upgraded LHCb detector in Run 3 will also be discussed.