CERN Accelerating science

LHCb Notes

VeloTT tracking algorithm: optimization for run II / Bowen, Espen Eie (Universitaet Zuerich (CH)) ; Storaci, Barbara (Universitaet Zuerich (CH)) ; Tresch, Marco (Universitaet Zuerich (CH))
This note describes track reconstruction in the LHCb tracking system upstream of the magnet, namely the VELO and TT sub-detectors. The implementation of the VeloTT algorithm and its performance in terms of track reconstruction efficiency, ghost rate and execution time per event are presented. [...]
LHCb-PUB-2015-024; CERN-LHCb-PUB-2015-024; LHCb-INT-2014-040.- Geneva : CERN, 2015

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Measurement of the front-end dead-time of the LHCb muon detector and evaluation of its contribution to the muon detection inefficiency. / Penso, Gianni (Universita e INFN, Roma I (IT)) ; Pinci, Davide (Universita e INFN, Roma I (IT)) ; Martellotti, Giuseppe (Universita e INFN, Roma I (IT))
A method is described which allows to deduce the dead-time of the front-end electronics of the LHCb muon detector from a series of measurements performed at different luminosities at a bunch-crossing rate of 20~MHz. The measured values of the dead-time range from $\sim 70$~ns to $\sim 100$~ns. [...]
LHCb-PUB-2015-023; CERN-LHCb-PUB-2015-023.- Geneva : CERN, 2015 - 14. Fulltext: PDF;

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A Study of the Merits of Precision Time Protocol (IEEE-1588) Across High-Speed Data Networks / Oliver, David (CERN) ; Otto, Adam Jedrzej (Ministere des affaires etrangeres et europeennes (FR)) ; Neufeld, Niko (CERN)
By using Precision Time Protocol across high-speed data networks, it is possible to achieve good time synchronisation without requiring the use of custom switches. Even under heavy network loads, the attainable precision far exceeds that which is possible with Network Time Protocol, and is sufficient for many applications. [...]
LHCb-PUB-2015-022; CERN-LHCb-PUB-2015-022.- Geneva : CERN, 2015 - 9. Fulltext: PDF;

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LHCb GPU Acceleration Project / Badalov, Alexey (University of Barcelona (ES)) ; Campora Perez, Daniel Hugo (CERN) ; Neufeld, Niko (CERN) ; Vilasis Cardona, Xavier (University of Barcelona (ES))
The LHCb detector is due to be upgraded for processing high-luminosity collisions, which will increase the load on its computation infrastructure from 100 GB/s to 4 TB/s, encouraging us to look for new ways of accelerating the Online reconstruction. The Coprocessor Manager is our new framework for integrating LHCb’s existing computation pipelines with massively parallel algorithms running on GPUs and other accelerators. [...]
LHCb-PUB-2015-021; CERN-LHCb-PUB-2015-021.- Geneva : CERN, 2015 Fulltext: PDF;

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Exploring improvements to the LHCb ELOG electronic logbook / Leung, Philip (CERN) ; Neufeld, Niko (CERN)
ELOG, the electronic logbook used by LHCb, has been suffering from poor accessibility and slow performance. Investigating revealed that a combination of inefficient searches, caused mainly by frequent reads of files stored in NFS, and an inability for the server to handle concurrent operations were rendering the service unusable for up to a minute when users performed search or sort operations. [...]
LHCb-PUB-2015-020; CERN-LHCb-PUB-2015-020.- Geneva : CERN, 2015 - 14. Fulltext: PDF;

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LHCb Computing Resource usage in 2015 (I) / Bozzi, Concezio (Universita di Ferrara (IT))
This documents summarizes the usage of computing resources by the LHCb collaboration during the period January 1st- aUGUST 25th 2015
LHCb-PUB-2015-019; CERN-LHCb-PUB-2015-019.- Geneva : CERN, 2015 - 27. Fulltext: PDF;

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LHCb Computing Resources: 2016 reassessment and 2017 requests / Bozzi, Concezio (Universita di Ferrara (IT))
This document presents a reassessment for 2016 and an estimate for 2017 of computing resources needed by LHCb, as resulting from the current LHC data taking and recent changes in the LHCb computing model parameters..
LHCb-PUB-2015-018; CERN-LHCb-PUB-2015-018.- Geneva : CERN, 2015 - 13. Fulltext: PDF;

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Measuring pion and kaon tracking efficiencies and asymmetries using charm decays with one partially reconstructed track / Vesterinen, Mika Anton (Ruprecht-Karls-Universitaet Heidelberg (DE)) ; Hellesund, Simen (University of Bergen (NO))
LHCb-PUB-2015-017; CERN-LHCb-PUB-2015-017.- Geneva : CERN, 2015

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A tool for $\gamma/\pi^0$ separation at high energies / Calvo Gomez, Miriam (University of Barcelona (ES)) ; Cogneras, Eric (Univ. Blaise Pascal Clermont-Fe. II (FR)) ; Deschamps, Olivier (Univ. Blaise Pascal Clermont-Fe. II (FR)) ; Hoballah, Mostafa (Univ. Blaise Pascal Clermont-Fe. II (FR)) ; Lefevre, Regis (Univ. Blaise Pascal Clermont-Fe. II (FR)) ; Monteil, Stephane (Univ. Blaise Pascal Clermont-Fe. II (FR)) ; Puig Navarro, Albert (Ecole Polytechnique Federale de Lausanne (CH)) ; Rives Molina, Vicente Jose (University of Barcelona (ES))
This note describes a tool developed to distinguish between photons and neutral pions that are reconstructed as a single cluster in the LHCb ECAL. The separation is achieved by using the fact that electromagnetic clusters produced by these two kinds of particles have different shape [...]
LHCb-PUB-2015-016; CERN-LHCb-PUB-2015-016.- Geneva : CERN, 2015

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Testbeam studies of pre-prototype silicon strip sensors for the LHCb UT upgrade project / Abba, Andrea (INFN, Milan) ; Artuso, Marina (Syracuse U.) ; Blusk, Steven (Syracuse U.) ; Britton, Thomas (Syracuse U.) ; Davis, Adam (Cincinnati U.) ; Dendek, Adam (AGH-UST, Cracow) ; Dey, Biplab (INFN, Milan) ; Ely, Scott (Syracuse U.) ; Fu, Jinlin (INFN, Milan) ; Gandini, Paolo (Oxford U.) et al.
The LHCb experiment is preparing for a major upgrade in 2018-2019. One of the key components in the upgrade is a new silicon tracker situated upstream of the analysis magnet of the experiment. [...]
arXiv:1506.00229; CERN-LHCb-PUB-2015-015; LHCb-PUB-2015-015.- Geneva : CERN, 2016 - 26 p. - Published in : Nucl. Instrum. Methods Phys. Res., A 806 (2016) 244-257 Elsevier Open Access article: PDF; Fulltext: LHCb-PUB-2015-015 - PDF; arXiv:1506.00229 - PDF; External link: Preprint

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