Selection and processing of calibration samples to measure the particle identification performance of the LHCb experiment in Run 2

Abstract

Since 2015, with the restart of the LHC for its second run of data taking, the LHCb experiment has been empowered with a dedicated computing model to select and analyse calibration samples to measure the performance of the particle identification (PID) detectors and algorithms. The novel technique was developed within the framework of the innovative trigger model of the LHCb experiment, which relies on online event reconstruction for most of the datasets, reserving offline reconstruction to special physics cases. The strategy to select and process the calibration samples, which includes a dedicated data-processing scheme combining online and offline reconstruction, is discussed. The use of the calibration samples to measure the detector PID performance, and the efficiency of PID requirements across a large range of decay channels, is described. Applications of the calibration samples in data-quality monitoring and validation procedures are also detailed.

References in corpus (26)

• LHCb Detector Performance
• sPlot: a statistical tool to unfold data distributions
• TMVA - Toolkit for Multivariate Data Analysis
• The LHCb Trigger and its Performance in 2011
• Performance of the LHCb RICH detector at the LHC
• Observation of the rare $B_s^0\to {\mu }^{+}{\mu }^{-}$ decay from the combined analysis of CMS and LHCb data
• First evidence for the decay Bs -> mu+ mu-
• Performance of the LHCb Vertex Locator
• Measurement of the $B_s^0\to {\mu }^{+}{\mu }^{-}$ branching fraction and search for $B^0\to {\mu }^{+}{\mu }^{-}$ decays at the LHCb experiment
• Performance of the LHCb Outer Tracker
• Performance of the LHCb muon system
• Measurement of the $B_s^0\to {\mu }^{+}{\mu }^{-}$ branching fraction and effective lifetime and search for $B^0\to {\mu }^{+}{\mu }^{-}$ decays
• Strong constraints on the rare decays Bs -> mu+ mu- and B0 -> mu+ mu-
• Tesla : an application for real-time data analysis in High Energy Physics
• Performance of the Muon Identification at LHCb
• Measurement of the CKM angle gamma from a combination of B->Dh analyses
• Search for the rare decays Bs -->mumu and Bd -->mumu
• Measurements of the $B^{+}$, $B^0$, $B_s^0$ meson and ${\Lambda }_b^0$ baryon lifetimes
• Measurement of the $B_c^{+}$ meson lifetime using $B_c^{+}\to J/\psi {\mu }^{+}{\nu }_{\mu }X$ decays
• Kernel density estimation of a multidimensional efficiency profile
• Measurement of $CP$ violation and constraints on the CKM angle $\gamma$ in $B^{\pm }\to D{K}^{\pm }$ with $D\to K_S^0{\pi }^{+}{\pi }^{-}$ decays
• Measurement of $CP$ observables in $B^{\pm }\to D^{(\ast )}{K}^{\pm }$ and $B^{\pm }\to D^{(\ast )}{\pi }^{\pm }$ decays
• Search for the rare decays Bs -> mu+ mu- and B0 -> mu+ mu-
• Measurement of the CKM angle γusing B^\pm --> D K^\pm with D-->K_Sπ^+π^-, K_SK^+K^- decays
• Performance of the LHCb High Level Trigger in 2012
• Search for long-lived heavy charged particles using a ring imaging Cherenkov technique at LHCb

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