Starting this year, the upgraded LHCb detector is collecting data with a pure software trigger. In its first stage, reducing the rate from 30MHz to about 1MHz, GPUs are used to reconstruct and trigger on B and D meson topologies and high-pT objects in the event. In its second stage, a CPU farm is used to reconstruct the full event and perform candidate selections, which are persisted for offline use with an output rate of about 10GB/s. Fast data processing, flexible and custom-designed data structures tailored for SIMD architectures and efficient storage of the intermediate data at various steps of the processing pipeline onto persistent media, e.g. tapes is essential to guarantee the full physics program of LHCb. In this talk, we will present the event model and data persistency developments for the trigger of LHCb in run 3. Particular emphasize will be given to the novel software-design aspects with respect to the Run 1+2 data taking, the performance improvements which can be achieved and the experience of restructuring a major part of the reconstruction software in a large HEP experiment.

The aim of the LHCb Upgrade II at the LHC is to operate at a luminosity of 1.5 x 1034 cm-2 s-1 to collect a data set of 300 fb-1. This will require a substantial modification of the current LHCb ECAL due to high radiation doses in the central region and increased particle densities. Advanced detector R&D for both new and ongoing experiments in HEP requires performing computationally intensive and detailed simulations as a part of the detector-design optimization process. We propose a versatile approach to this task that is based on machine learning and can substitute the most computationally intensive steps of the process while retaining the GEANT4 accuracy to details. The approach covers entire detector representation from the event generation to the evaluation of the physics performance. The approach allows us to use an arbitrary arrangement of calorimetric modules of different types, various signal and background conditions, tunable reconstruction algorithms, and desired physics performance metrics. Being combined with properties of detector and electronic prototypes obtained from beam tests, the approach becomes even more versatile. We focus on the Upgrade II of the LHCb ECAL under the requirements for operation under high luminosity conditions. We discuss the general design of the approach, and particular estimations including energy, timing and spatial resolution for the future LHCb ECAL setup under different pile-up conditions. This contribution presents an overview of the deep learning approaches that are proposed to be used for reconstruction of the LHCb ECAL at high luminosities.

LHCb collaboration is releasing research-quality data to the public for the very first time. A data sample amounting to 200TB has been obtained in 2011 and 2012 during the Run I of the Large Hadron Collider. The data is aquired by the LHCb detector by recording the information of proton collisions in the LHC. The data has undergone a preprocessing step where physics objects, such as the trajectories of charged particles, were reconstructed from the raw information delivered by the complex detector system. The data is filtered and classified according to 300 physical processes and decays. The data is made available in the same format as is used internally by the LHCb physicists and is accompanied by extensive metadata and documentation, as well as a Glossary explaining several hundred special terms used in the preprocessing. The data can be analyzed using dedicated LHCb software, which is open-source.

Particle correlations are a powerful tool to study the bulk properties in relativistic heavy ion collisions. The momentum correlations between identical particles originating from the same particle-emitting source, referred to as the Bose-Einstein correlations, measure scales that are related to the geometrical size of the source. The two particle azimuthal angular correlations measure the momentum spatial anisotropy of produced particles, providing information on collective phenomena arising in the dense nuclear medium. This poster will discuss new LHCb measurements of Bose-Einstein correlations and collective flow coefficients in pPb and PbPb collisions in the forward rapidity region.

The LHCb experiment has recently undergone a series of major upgrades: the entire tracking system has been replaced with higher-granularity sensors, the readout electronics have been upgraded, and all hardware triggers have been replaced with a new state-of-the-art streaming readout system. In addition, the gaseous target SMOG system has been upgraded with a dedicated storage cell to greatly increase the rate of fixed target collisions at LHCb. This talk will include the first performance results from the new LHCb tracking system, the streaming readout system, and SMOG II, with a focus on how these upgrades directly impact the LHCb heavy ion physics program. Further upgrades planned for LHC Run 4 and 5 will also be discussed.

In the Standard Model of particle physics, lepton flavour and lepton number are conserved quantities, although there is no fundamental symmetry associated with their conservation and lepton flavour violation has been already confirmed by the observation of neutrino oscillations. Many lepton flavour violating (LFV) and lepton number violating (LNV) processes can be searched for in B meson decays and the LHCb experiment plays a very important role in this sector. The observation of charged LFV or LNV decays would be a clear sign of new physics beyond Standard Model. The most recent results of searches for LFV and LNV B meson decays at LHCb are presented in the talk. In addition, possible perspectives on this topic, such as searches for heavy neutral leptons, will be discussed.

It is of great interest to search for the phenomenon of CP violation in the decays of b baryons given that a significant amount of CP violation has been observed in b meson decays. This motivates searches for new decay modes of the Xib and Omegab baryons and studies of their production properties. In this analysis we search for decays that will be helpful to control the systematics in future CP violation studies. The results would help to increase the knowledge about b baryon production and decays. In addition, studies of the resonant structure of the multibody decays provide new insights into charm baryon spectroscopy

Luminosity measurement is a fundamental parameter for all the experiments. The LHCb detector works at a lower luminosity with respect to CMS and ATLAS. It is done by tuning the distance between the two colliding beams according to the measurement of instantaneous luminosity from hardware-based trigger counters. The upgraded LHCb detector operates at fivefold instantaneous luminosity compared to the previous runs, and it has a fully software-based trigger. Consequently, a new approach to the luminosity measurement is adopted. New counters have been introduced for Run 33. Additionally, in order to verify linearity from calibration to data taking conditions, per-fill emittance scans are performed. For the first time, a new detector capable of measuring the LHC luminosity has been installed at the interaction point of LHCb. It is named Probe for LUminosity MEasurement - PLUME. It enables real time monitoring of beam condition parameters and it provides both online and offline luminosity measurements

The large production cross-sections of W and Z bosons at hadron colliders offer unique opportunities to search for their rare decays. W/Z boson rare decay can be used to test the Standard Model(SM) and probe for physics beyond SM, and provide stringent tests of the quantum chromodynamics(QCD) factorization formalism. Predictions of their branching fractions using the QCD factorization range from $10^{-6}$ to $10^{-12}$. A search for the rare decays $W^{+}→D^{+}_{s} \gamma$ and $Z→D^{0} \gamma$ is performed using proton-proton collision data collected by the LHCb experiment at a centre-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 2.0 fb^{-1}. No significant signal is observed for either decay mode and upper limits on their branching fractions are set.

The Vertex Locator (VELO) is the innermost part of the LHCb detector, positioned around 3.5mm from the collision region, inside the LHC vacuum. For safety, both halves are held away from the beams during injection. Then, each half reconstructs the position of the primary vertices, allowing the VELO to close and centre around the colliding beams. The VELO closes in several stages, with safety criteria being automatically checked at each stage. The VELO was closed for the first time in Run 3 in October. Using initial data taken from the first closing, we can study the shape of the RF foil from hadronic interactions with the material. This can be compared to the design position, and can also be used to verify that the VELO is well centred around the beams