The upgraded LHCb detector has started data taking in Run 3 with a completely new DAQ system, in which every LHC crossing is reconstructed in detail before trigger decisions are made (Real Time Analysis). This system is key to the physics objectives of LHCb performance, and the collaboration is now considering how it can be enhanced for the higher luminosities targeted by its Upgrade II. Here we describe an R&D effort towards a real-time tracking device based on a distributed system of FPGAs, that would provide early reconstruction primitives at the pre-build level to accelerate the reconstruction process in HLT1 and HLT2. We show first results from a prototype device currently running opportunistically on live LHCb data during Run 3 physics data taking. This technology forms the basis of a project for accelerating the computationally expensive and important task of track reconstruction in the forward region. This project is currently being considered by the LHCb collaboration as a LS3 enhancement.

High-energy physics is facing increasingly computational challenges in real-time event reconstruction for the near-future high-luminosity era, especially for charged particles track finding. In this poster, I present a recently developed algorithm for track reconstruction based on the minimisation of an Ising-like Hamiltonian with a linear algebra approach: the track finding problem is translated into a sparse system of linear equations, which is suitable to be solved on a quantum computer, using the Harrow-Hassadim-Lloyd (HHL) algorithm. This approach can potentially provide an exponential speedup as a function of the number of input hits over its classical counterpart, in spite of the current limitations due to the HHL Hamiltonian simulation and readout problems. The performance of our algorithm has been assessed using simulated events in the LHCb Vertex Locator, while the quantum implementation has been tested using smaller toy-model events.

According to the Standard Model (SM), the lepton flavour is conserved in electroweak transitions, meaning that the different flavors of leptons do not mix or transform into each other. Observation of Lepton-Flavour Violating (LFV) processes would be a clear signal of physics beyond the Standard Model. This poster discusses recent results on charged LFV searches with b-hadron decays at the LHCb experiment.

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.

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.