The LHCb experiment in Run 3 features a full software trigger: the GPU-based HLT1 with O(100) and the CPU-based HLT2 with O(3000) trigger lines. Human control of every aspect of data quality in a complex system of this scale is extremely difficult and requires a high degree of automation to be efficient. To address this, we present IntelliRTA, a monitoring dashboard that provides a holistic view of the trigger lines and the data quality. It correlates HLT1 rates with detector and beam conditions to identify the impact of potential issues. It features automated trend analysis for all HLT2 lines and flags unexpected rate and bandwidth changes. Furthermore, it consolidates several other tools such as a bandwidth monitor onto a single webpage, providing a unified user interface.

The inclusive production of $\eta_c$ and $\chi_c$ charmonium states in $b$-hadron decays is studied with the LHCb Run~2 data, corresponding to an integrated luminosity of 5.4 $fb^{-1}$, using charmonia decays to $\phi\phi$ pairs. The branching fractions of the production of the $\chi_c$ states in $b$ decays are measured, using $\eta_c (1S)$ as a normalisation channel, to be \begin{align*} &\mathcal{B} (b \to \chi_{c0} X) = (1.37 \pm 0.13 \pm 0.07 \pm 0.38) \times 10^{-3},\\ &\mathcal{B} (b \to \chi_{c1} X) = (1.53 \pm 0.11 \pm 0.09 \pm 0.43) \times 10^{-3},\\ &\mathcal{B} (b \to \chi_{c2} X) = (0.53 \pm 0.05 \pm 0.04 \pm 0.15) \times 10^{-3}, \end{align*} where the first uncertainty is statistical, the second is systematic and the last is due to limited knowledge of externally measured branching fractions. The production of $\eta_c (2S)$ times the branching fraction of its decay into $\phi \phi$ is measured as $\mathcal{B} (b \to \eta_c (2S) X) \times \mathcal{B} (\eta_c (2S) \to \phi \phi) = (3.91 \pm 0.59 \pm 0.57 \pm 1.07) \times 10^{-7}$. This study also measures the mass $M_{\eta_c (1S)} = 2984.10 \pm 0.49 \pm 0.48$ MeV$/c^2$ with the best precision to date.

The first level of LHCb's trigger system (HLT1) performs real-time reconstruction and selection of events at the LHC bunch crossing rate using GPUs. It must balance the diverse goals of the LHCb physics programme, which spans from charm to electroweak physics. To maximize the output for the entirety of LHCb's physics programme, an automated bandwidth division is employed: a procedure to determine the optimal selection criteria while ensuring a cap on the total output rate and satisfying constraints imposed by other components of the trigger. This poster will present an overview of the bandwidth division algorithm, its place in the LHCb real-time analysis paradigm, as well as its current status following the changes for the 2025 trigger configuration, consisting of approximately 25 trigger selection parameters, shared between the ~30 main physics lines.

The LHCb experiment is preparing for its Upgrade II, during which the instantaneous luminosity will increase by at least a factor of five with respect to Run 3, reaching 1.0×1034cm−2s−1. The increase in luminosity is very demanding on the detectors. To address these challenges, the current silicon micro-strip Upstream Tracker (UT) will be replaced by a new Upstream Pixel (UP) detector, consisting of four layers of MAPS-based pixel sensors. Located upstream of the dipole magnet, the UP detector is a crucial component of the LHCb tracking system. It provides fast momentum estimates for the trigger system and is essential for reconstructing long-lived particles. This poster will present detailed simulation and reconstruction studies of the UP detector, including investigations of new detector geometries, tracking efficiency, ghost rate, and momentum resolution under Upgrade II conditions.

The new fully software-based trigger of the LHCb experiment operates at a 30 MHz data rate, opening a search window into previously unexplored regions of physics phase space. The BuSca (Buffer Scanner) project at LHCb acquires, reconstructs and analyzes data in real time, extending sensitivity to new lifetimes and mass ranges though the recently deployed Downstream tracking algorithm. BuSca identifies hotspots indicative of potential new particle candidates in a model-independent manner, providing strategic guidance for developing new trigger requirements. To control the background, regions with minimal detector material interactions are selected, and pairs of same-sign tracks are used to suppress combinatorial background. The poster presents the results from the analysis of the first data from October 2024.

Pending

The Compact Linear Collider (CLIC) Damping Rings (DRs) need to generate ultra-low emittance bunches to achieve high luminosity in CLIC. This requires many wiggler magnets with big energy loss which is compensated by the Radio Frequency (RF) system. The resulting strong beam loading transients lead to a challenging design for the RF system. A novel SRF cavity at 2 GHz with an ultra-low R/Q parameter of below 1 Ω is proposed to minimize the transient beam loading effects below acceptable level. The design and fabrication of the bulk Nb prototype based on turning from a single piece of Nb and EB welding is presented. Moreover, conceptual study of the system for cavity surface treatment to achieve the highest surface magnetic field which is the main goal of the prototype cold test is described as well. To enable excellent performance in this cavity, we plan to apply the 75/120C modified low temperature bake in combination with the cold electropolishing process. This surface treatment approach has been shown to consistently deliver high accelerating gradients and improved quality factors in TESLA-shaped 1.3 GHz SRF cavities. By adapting and implementing this process for the 2 GHz ultra-low R/Q design, we aim to maximize the achievable surface magnetic field while minimizing residual resistance and field emission. This treatment strategy will be critical for demonstrating that the cavity can meet the demanding performance requirements of the CLIC damping ring RF system under high beam loading conditions.

The LHCb detector, with its forward rapidity coverage, can probe kinematic regions at low Bjorken-x as low as . This unique capability, combined with excellent momentum resolution, vertex reconstruction, and particle identification, enables precision measurements at low transverse momentum and forward rapidity. Studies of associated production of $\Psi(2S)$ and $\Phi$ in diffractive proton-proton collisions at the LHCb experiment will be discussed. At LHC energies, investigations of diffractive events provide valuable insights into QCD phenomena. These include understanding the characteristics of pomerons and exotic hadronic states, as well as examining low-x gluon distributions and the effects of saturation.

The study of charge asymmetries in three-body 𝐵 ± → h h h decays provides a sensitive probe of CP violation in the beauty sector. Using the first data collected during LHCb Run 3, we are performing a preliminary investigation aimed at measuring these asymmetries through fits to the invariant mass distributions of selected candidates. The upgraded detector and higher instantaneous luminosity of Run 3 are expected to improve signal-to-background separation and reduce systematic uncertainties, offering enhanced sensitivity compared to previous runs. This ongoing study will lay the groundwork for precise tests of the Standard Model and potential exploration of effects beyond it.