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LHCb Detector Performance Papers

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Centrality determination in heavy-ion collisions with the LHCb detector / LHCb Collaboration
The centrality of heavy-ion collisions is directly related to the medium created therein. [...]
arXiv:2111.01607 ; CERN-LHCb-DP-2021-002.
- 31 p.

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A Neural-Network-defined Gaussian Mixture Model for particle identification applied to the LHCb fixed-target programme / Graziani, Giacomo (INFN, Florence) ; Anderlini, Lucio (INFN, Florence) ; Mariani, Saverio (INFN, Florence ; Florence U. ; CERN) ; Franzoso, Edoardo (INFN, Ferrara ; Ferrara U.) ; Pappalardo, Luciano (INFN, Ferrara ; Ferrara U.) ; di Nezza, Pasquale (Frascati)
Particle identification in large high-energy physics experiments typically relies on classifiers obtained by combining many experimental observables. [...]
arXiv:2110.10259 ; LHCb-DP-2021-007.
- 28 p.

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Characterisation of signal-induced noise in Hamamatsu R11265 Multianode Photomultiplier Tubes / LHCb Collaboration
Signal-induced noise is observed in Hamamatsu R11265 Multianode Photomultiplier Tubes, manifesting up to several microseconds after the single photoelectron response signal and localised in specific anodes. The mean number of noise pulses varies between devices, and shows significant dependence on the applied high-voltage. [...]
arXiv:2110.00831; CERN-LHCb-DP-2021-005.- 2021-10-02 - 24 p. - Published in : JINST 16 (2021) P11030 Fulltext: PDF; Fulltext from publisher: PDF;

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A Comparison of CPU and GPU implementations for the LHCb Experiment Run 3 Trigger / LHCb Collaboration
The LHCb experiment at CERN is undergoing an upgrade in preparation for the Run 3 data taking period of the LHC. [...]
arXiv:2105.04031 ; LHCb-DP-2021-003.
- 2021. - 27 p.

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A parametrized Kalman filter for fast track fitting at LHCb / Billoir, Pierre (Paris U., VI-VII) ; De Cian, Michel (Ecole Polytechnique, Lausanne) ; Günther, Paul André (Heidelberg U.) ; Stemmle, Simon (Heidelberg U.)
We present an alternative implementation of the Kalman filter employed for track fitting within the LHCb experiment. It uses simple parametrizations for the extrapolation of particle trajectories in the field of the LHCb dipole magnet and for the effects of multiple scattering in the detector material. [...]
arXiv:2101.12040; LHCb-DP-2021-001.- 2021-08 - 7 p. - Published in : Comput. Phys. Commun. 265 (2021) 108026 Fulltext from publisher: PDF; Related data file(s): ZIP;

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Calibration and performance of the LHCb calorimeters in Run 1 and 2 at the LHC / Abellán Beteta, Carlos (ICC, Barcelona U.) ; Alfonso Albero, A. (ICC, Barcelona U.) ; Amhis, Y. (IJCLab, Orsay) ; Barsuk, S. (IJCLab, Orsay) ; Beigbeder-Beau, C. (IJCLab, Orsay) ; Belyaev, I. (Kurchatov Inst., Moscow) ; Bonnefoy, R. (Clermont-Ferrand U.) ; Breton, D. (IJCLab, Orsay) ; Callot, O. (IJCLab, Orsay) ; Calvo Gomez, M. (ICC, Barcelona U.) et al.
The calibration and performance of the LHCb Calorimeter system in Run 1 and 2 at the LHC are described. [...]
arXiv:2008.11556 ; CERN-LHCb-DP-2020-001.
- 51 p.

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Muon identification for LHCb Run 3 / Anderlini, Lucio ; Anderlini, L. (INFN, Florence) ; Archilli, F. (Heidelberg U.) ; Cardini, A. (INFN, Cagliari) ; Cogoni, V. (INFN, Cagliari) ; Fontana, M. (CERN) ; Graziani, G. (INFN, Florence) ; Kazeev, N. (Higher Sch. of Economics, Moscow ; U. Rome La Sapienza (main)) ; Kuindersma, H. (Nikhef, Amsterdam) ; Oldeman, R. (INFN, Cagliari) et al.
Muon identification is of paramount importance for the physics programme of LHCb. In the upgrade phase, starting from Run 3 of the LHC, the trigger of the experiment will be solely based on software. [...]
arXiv:2008.01579; LHCb-DP-2020-002.- 2020-12-10 - 15 p. - Published in : JINST 15 (2020) T12005 Fulltext from publisher: PDF;

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Measurement of the electron reconstruction efficiency at LHCb / LHCb Collaboration
The single electron track-reconstruction efficiency is determined using a sample corresponding to $1.3~\mathrm{fb}^{-1}$of $pp$ collision data recorded with the LHCb detector in 2017. This measurement exploits $B^+\to J/\psi (e^+e^-)K^+$ decays, where one of the electrons is fully reconstructed and paired with the kaon, while the other electron is reconstructed using only the information of the vertex detector. [...]
arXiv:1909.02957; LHCb-DP-2019-003; CERN-EP-2019-181.- 2019 - 21 p. - Published in : JINST 14 (2019) P11023 Fulltext: PDF; Fulltext from publisher: Aaij_2019_J._Inst._14_P11023 (1) - PDF; Aaij_2019_J._Inst._14_P11023 - PDF;

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Long-term Operation of the Multi-Wire-Proportional-Chambers of the LHCb Muon System / Albicocco, F.P. (Frascati) ; Anderlini, L. (INFN, Florence) ; Anelli, M. (Frascati) ; Archilli, F. (Nikhef, Amsterdam) ; Auriemma, G. (INFN, Rome ; Basilicata U., Potenza) ; Baldini, W. (INFN, Ferrara) ; Bencivenni, G. (Frascati) ; Bondar, N. (St. Petersburg, INP) ; Bochin, B. (St. Petersburg, INP) ; Brundu, D. (INFN, Cagliari) et al.
The muon detector of LHCb, which comprises 1368 multi-wire-proportional-chambers (MWPC) for a total area of 435 m2, is the largest instrument of its kind exposed to such a high-radiation environment. In nine years of operation, from 2010 until 2018, we did not observe appreciable signs of ageing of the detector in terms of reduced performance. [...]
arXiv:1908.02178; LHCb-DP-2020-003.- 2019 - 20 p. - Published in : JINST 14 (2019) P11031 Fulltext from publisher: PDF;

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Real-time discrimination of photon pairs using machine learning at the LHC / Benson, Sean (Nikhef, Amsterdam) ; Casais Vidal, Adrián (Santiago de Compostela U., IGFAE) ; Cid Vidal, Xabier (Santiago de Compostela U., IGFAE) ; Puig Navarro, Albert (Zurich U.) /LHCb Collaboration
ALP-mediated decays and other as-yet unobserved $B$ decays to di-photon final states are a challenge to select in hadron collider environments due to the large backgrounds that come directly from the $pp$ collision. We present the strategy implemented by the LHCb experiment in 2018 to efficiently select such photon pairs. [...]
arXiv:1906.09058; CERN-LHCb-DP-2019-004.- 2019-11-13 - 16 p. - Published in : SciPost Phys. 7 (2019) 062 Fulltext: PDF;

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