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LHCb Figures

SciFi tracking alignment with LHCb Run 3 commissioning data /LHCb collaboration
We present preliminary results showing the impact of survey measurements and the track-based alignment procedure with LHCb Run 3 early data, with a focus on long tracks reconstructed in the VELO and SciFi subdetectors. This data was recorded on 27.10.2022 with the VELO in a closed position [...]
LHCB-FIGURE-2022-018.- Geneva : CERN, 29 - 3. Fulltext: main-3 - PDF; LHCb-FIGURE-2022-018 - ZIP;

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Coarse Time Alignment of the SciFi - Run253101 - LHCb Commissioning /LHCb Collaboration
The clusters observed in TAE events as a function of data link (sipm). The majority of have been aligned in the central BX with some links ( less than one per cent) showing a single bx shift [...]
LHCB-FIGURE-2022-017.- Geneva : CERN, 2022 - 2. Fulltext: main-2 - PDF; h_meanTAE - PDF;

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VELO alignment with LHCb Run 3 early data /LHCb Collaboration
The impact of the survey measurement and the track-based alignment procedure on tracks reconstructed in the VELO detector with LHCb Run 3 early data is presented. The data was taken on 06.10.2022 with the VELO in an almost fully closed position, where each VELO half was placed at a distance of 2 mm from the nominal fully-closed position. [...]
LHCB-FIGURE-2022-016.- Geneva : CERN, 2022 - 6. Fulltext: LHCb-FIGURE-2022-016 - ZIP; main - PDF;

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Recent updates from PV-finder for ACAT 2022 /LHCb Collaboration
Recent updated results from the PV-finder DNN algorithm are given here (to be shown at ACAT 2022). In particular, we present an updated plot of the performance plot (Efficiency vs False positive rate) adding the results from the latest model (from tracks parameters to PVs) [...]
LHCB-FIGURE-2022-015.- Geneva : CERN, 2022 - 4. Fulltext: LHCb-FIGURE-2022-015 - ZIP; main-1 - PDF;

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Validation of the Lamarr framework with $\Lambda_b^0 \to \Lambda_c^+ \mu^- X$ decays /LHCb collaboration
Lamarr is the LHCb software for Ultra-Fast Simulation, designed to ease the integration of complex parametrizations, possibly based on machine-learning algorithms, within Gauss. As part of its validation, we compare the distribution of analysis-level quantities for the semileptonic decay $\Lambda_b^0 \to \Lambda_c^+ \mu^- X$ with $\Lambda_c^+ \to p K^- \pi^+$ as simulated with Pythia8, EVTGEN and Geant4, and then processed through Boole to model the sub-detectors response and finally reconstructed by the Brunel application, with the simulation of the same decay mode as obtained with Pythia8, EVTGEN and Lamarr. [...]
LHCB-FIGURE-2022-014.- Geneva : CERN, 30 - m. pages. Fulltext: PDF;

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Van der Meer scans in Run 2 /LHCb Collaboration
We show the preliminary results from the first Van der Meer scan of Run 2..
LHCB-FIGURE-2022-013.- Geneva : CERN, 2022 - m. pages.

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First absolute calibration of the PLUME online luminometer in Run 3 /LHCb collaboration
Very preliminary results from the van der Meer scans performed on June 5, 2022 using the online counters from the PLUME detector are presented. The preliminary absolute calibration at $\sqrt{s}=0.9$ TeV for the online instantaneous luminosity provided by the PLUME detector is determined [...]
LHCB-FIGURE-2022-012.- Geneva : CERN, 24 - m. pages. Fulltext: main - PDF; LHCb-FIGURE-2022-012 - ZIP;

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Reconstructibility of long-lived particles beyond the Standard Modelat LHCb Run 3 /LHCb collaboration
The LHCb detector reconstructs charged tracks in different categories, depending on the subdetectors used for the reconstruction. These track categories are used differently in the LHCb trigger and in analysis. [...]
LHCB-FIGURE-2022-011.- Geneva : CERN, 2022 - 4. Fulltext: lhcb-figure-2022-00X - ZIP; lhcb_figure_2022_00X (8) - PDF;

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Standalone track reconstruction and matching algorithms for the GPU-based High Level Trigger at LHCb /LHCb collaboration
We present the performance of an alternative track reconstruction for LHCb’s first level High Level Trigger (Allen). A version of this reconstruction starts with two monolithic tracking algorithms, the VELO-pixel tracking and the HybridSeeding on Scintillating-Fiber tracker, which reconstructs track segments in standalone subdetectors. [...]
LHCB-FIGURE-2022-010.- Geneva : CERN, 24 - 15. Fulltext: lhcb-figure-2022-010 - ZIP; LHCb-FIGURE-2022-010 - PDF;

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Long-lived particle reconstruction and selection downstream of the LHCb magnet /LHCb collaboration
A series of figures demonstrating the feasibility and performance of long-lived particle reconstruction and selection downstream of the LHCb magnet is shown, using Run 2 simulation and data..
LHCB-FIGURE-2022-009.- Geneva : CERN, 24 - 7. Fulltext: PDF;

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