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

• Published in: EPJ techniques and instrumentation 2019-02, Vol.6 (1), p.1-16, Article 1
• Main Authors: Aaij, Roel, Anderlini, Lucio, Benson, Sean, Cattaneo, Marco, Charpentier, Philippe, Clemencic, Marco, Falabella, Antonio, Ferrari, Fabio, Fontana, Marianna, Gligorov, Vladimir Vava, Hill, Donal, Humair, Tibaud, Jones, Christopher Robert, Lupton, Oliver, Malde, Sneha, Benito, Carla Marin, Matev, Rosen, Pearce, Alex, Poluektov, Anton, Sciascia, Barbara, Stagni, Federico, Gomez, Ricardo Vazquez, Zhang, Yanxi
• Format: Article
• Language: English
• Subjects: Algorithms; Atomic; Biological and Medical Physics; Biomaterials; Biophysics; Calibration; Characterization and Evaluation of Materials; Data acquisition; Data analysis methods; Data processing; Experimental methods; Experimental methods and data analysis methods; Experiments; Large Hadron Collider; Measurement Science and Instrumentation; Molecular; Optical and Plasma Physics; Performance evaluation; Physics; Physics and Astronomy; Reconstruction; Research Article; Spectroscopy and Microscopy
• ISSN: 2195-7045; 2195-7045
• DOI: 10.1140/epjti/s40485-019-0050-z

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.