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

Aaij, Roel; Benson, S.; Vazquez Gomez, Ricardo; Fontana, M.; Gligorov, Vladimir Vava; Falabella, Antonio; Marin Benito, Carla; Pearce, Alex; Lupton, Oliver; Cattaneo, Marco; Zhang, Yan-Xi; Sciascia, Barbara; Anderlini, L.; Charpentier, Philippe; Stagni, Federico; Humair, Tibaud; Ferrari, Fabio; Jones, Christopher Robert; Hill, Donal; Poluektov, Anton; Matev, Rosen; Malde, Sneha; Clemencic, Marco

doi:10.1140/epjti/s40485-019-0050-z

Article
Report number	arXiv:1803.00824 ; LHCb-DP-2018-001 ; LHCB-DP-2018-001
Title	Selection and processing of calibration samples to measure the particle identification performance of the LHCb experiment in Run 2
Author(s)	Aaij, Roel (NIKHEF, Amsterdam) ; Anderlini, L. (INFN, Florence) ; Benson, S. (NIKHEF, Amsterdam) ; Cattaneo, Marco (CERN) ; Charpentier, Philippe (CERN) ; Clemencic, Marco (CERN) ; Falabella, Antonio (INFN, Bologna) ; Ferrari, Fabio (INFN, Bologna) ; Fontana, M. (CERN) ; Gligorov, Vladimir Vava (Paris U., VI-VII) ; Hill, Donal ; Humair, Tibaud (Imperial Coll., London) ; Jones, Christopher Robert (Unlisted, US) ; Lupton, Oliver (CERN ; Warwick U.) ; Malde, Sneha (U. Oxford (main)) ; Marin Benito, Carla (Orsay, LAL) ; Matev, Rosen (CERN) ; Pearce, Alex (CERN) ; Poluektov, Anton (Warwick U. ; Aix-Marseille U.) ; Sciascia, Barbara (Frascati) ; Stagni, Federico (CERN) ; Vazquez Gomez, Ricardo (CERN) ; Zhang, Yan-Xi (CERN)
Publication	2019-02-28
Imprint	2018-03-02
Number of pages	18
In:	EPJ Tech. Instrum. 6 (2019) 1
DOI	10.1140/epjti/s40485-019-0050-z
Subject category	hep-ex ; Particle Physics - Experiment
Accelerator/Facility, Experiment	CERN LHC ; LHCb
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.
Copyright/License	publication: (License: CC-BY-4.0) preprint: (License: CC-BY-4.0)

$On the left, mass distributions of the decaying particles with the results of the fit superimposed; signal contributions are shown by the red dashed curves, and the total fit functions including background contributions are shown by the blue solid curves. On the right, the background-subtracted distributions of the calibration samples for electrons, muons, pions, kaons and protons as a function of the track pseudorapidity, $\eta$, and momentum \ptot are shown. The colour scale units are arbitrary.$ $On the left, mass distributions of the decaying particles with the results of the fit superimposed; signal contributions are shown by the red dashed curves, and the total fit functions including background contributions are shown by the blue solid curves. On the right, the background-subtracted distributions of the calibration samples for electrons, muons, pions, kaons and protons as a function of the track pseudorapidity, $\eta$, and momentum \ptot are shown. The colour scale units are arbitrary.$ $On the left, mass distributions of the decaying particles with the results of the fit superimposed; signal contributions are shown by the red dashed curves, and the total fit functions including background contributions are shown by the blue solid curves. On the right, the background-subtracted distributions of the calibration samples for electrons, muons, pions, kaons and protons as a function of the track pseudorapidity, $\eta$, and momentum \ptot are shown. The colour scale units are arbitrary.$ Show more plots

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