CERN Accelerating science

LHCb Notes

Radiation environment of the LHCb Calorimeters in 2010-2013 / Corti, Gloria (CERN) ; Karacson, Matthias (Ruprecht-Karls-Universitaet Heidelberg (DE))
A set of passive and active radiation detectors has been installed around and in between the LHCb calorimeter subsystems to measure different aspects of the radiation environment. Cross calibrations between various types of measurements are performed and correlated with the evolving run conditions. [...]
LHCb-PUB-2017-013; CERN-LHCb-PUB-2017-013.- Geneva : CERN, 2017

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in preparation / Papanestis, Antonis (STFC - Rutherford Appleton Lab. (GB))
in preparation
LHCb-PUB-2017-012; CERN-LHCb-PUB-2017-012.- Geneva : CERN, 2017

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Fast neural-net based fake track rejection / De Cian, Michel (Ruprecht-Karls-Universitaet Heidelberg (DE)) ; Farry, Stephen (University of Liverpool (GB)) ; Seyfert, Paul (Universita & INFN, Milano-Bicocca (IT)) ; Stahl, Sascha (CERN)
A neural-network based algorithm to identify fake tracks in the LHCb pattern recognition is presented. This algorithm, called ghost probability, is fast enough to fit into the CPU time budget of the software trigger farm. [...]
LHCb-PUB-2017-011; CERN-LHCb-PUB-2017-011.- Geneva : CERN, 2017

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LHCb Computing Resource usage in 2016 (II) / Bozzi, Concezio (Universita di Ferrara & INFN (IT))
This documents reports the usage of computing resources by the LHCb collaboration during the period January 1st – December 31st 2016..
LHCb-PUB-2017-010; CERN-LHCb-PUB-2017-010.- Geneva : CERN, 2017 - 33. Fulltext: PDF;

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LHCb Computing Resources: 2018 requests and preview of 2019 requests / Bozzi, Concezio (Universita di Ferrara & INFN (IT))
This document presents a reassessment of computing resources needed by LHCb in 2018 and a preview of computing requests for 2019, as resulting from the current experience of Run2 data taking and recent changes in the LHCb computing model parameters..
LHCb-PUB-2017-009; CERN-LHCb-PUB-2017-009.- Geneva : CERN, 2017 - 12. Fulltext: PDF;

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A setup to perform X-ray irradiation tests on scintillating fibres for the SciFi project / Gavardi, Laura (Technische Universitaet Dortmund (DE)) ; Rodrigues Cavalcante, Ana Barbara (CBPF - Brazilian Center for Physics Research (BR)) ; Joram, Christian (CERN) ; Kristic, Robert (CERN)
An X-ray setup has been installed at CERN. The setup will serve for quality assurance purposes related to the acceptance of $11'000~ \text{km}$ of scintillating plastic fibres for the SciFi detector of LHCb. [...]
LHCb-PUB-2017-008; CERN-LHCb-PUB-2017-008.- Geneva : CERN, 2017 Fulltext: PDF;

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Optimization of the Muon Identification software for LHCb Run II / Albrecht, Johannes (Technische Universitaet Dortmund (DE)) ; Dettori, Francesco (University of Liverpool (GB)) ; Dungs, Kevin (CERN) ; Lopes, Helder (Univ. Federal do Rio de Janeiro (BR)) ; Martinez Santos, Diego (Universidade de Santiago de Compostela (ES)) ; Prisciandaro, Jessica (Universidade de Santiago de Compostela (ES)) ; Sciascia, Barbara (Istituto Nazionale Fisica Nucleare Frascati (IT)) ; Syropoulos, Vasileios (Nikhef National institute for subatomic physics (NL)) ; Vazquez Gomez, Ricardo (Istituto Nazionale Fisica Nucleare Frascati (IT))
The muon identification code in the LHCb HLT software trigger and offline reconstruction has been revisited in view of the LHC Run 2. This software has undergone a significant refactorisation, resulting in a modularized common code base between the HLT and offline event processing [...]
LHCb-PUB-2017-007; CERN-LHCb-PUB-2017-007.- Geneva : CERN, 2017

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Upgrade trigger: Bandwidth strategy proposal / Fitzpatrick, Conor (Ecole Polytechnique Federale de Lausanne (CH)) ; Williams, J Michael (Massachusetts Inst. of Technology (US)) ; Meloni, Simone (Universita & INFN, Milano-Bicocca (IT)) ; Boettcher, Thomas Julian (Massachusetts Inst. of Technology (US)) ; Whitehead, Mark Peter (CERN) ; Dziurda, Agnieszka (CERN) ; Vesterinen, Mika Anton (Ruprecht-Karls-Universitaet Heidelberg (DE))
This document describes a selection strategy for the upgrade trigger using charm signals as a benchmark. The Upgrade trigger uses a 'Run 2-like' sequence consisting of a first and second stage, in between which the calibration and alignment is performed. [...]
LHCb-PUB-2017-006; CERN-LHCb-PUB-2017-006.- Geneva : CERN, 2017 - 12. Fulltext: PDF;

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Upgrade trigger: Biannual performance update / Aaij, Roel (CERN) ; Albrecht, Johannes (Technische Universitaet Dortmund (DE)) ; Couturier, Ben (CERN) ; Esen, Sevda (Ruprecht-Karls-Universitaet Heidelberg (DE)) ; De Cian, Michel (Ruprecht-Karls-Universitaet Heidelberg (DE)) ; De Vries, Jacco Andreas (Nikhef National institute for subatomic physics (NL)) ; Dziurda, Agnieszka (CERN) ; Fitzpatrick, Conor (Ecole Polytechnique Federale de Lausanne (CH)) ; Fontana, Marianna (Universita e INFN, Cagliari (IT)) ; Grillo, Lucia (Universita & INFN, Milano-Bicocca (IT)) et al.
This document presents the performance of the LHCb Upgrade trigger reconstruction sequence, incorporating changes to the underlying reconstruction algorithms and detector description since the Trigger and Online Upgrade TDR. An updated extrapolation is presented using the most recent example of an Event Filter Farm node..
LHCb-PUB-2017-005; CERN-LHCb-PUB-2017-005.- Geneva : CERN, 2017 - 19. Fulltext: PDF;

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BDT based inclusive charm trigger / Amerio, Silvia (Universita e INFN, Padova (IT)) ; Gligorov, Vladimir (Centre National de la Recherche Scientifique (FR)) ; Lucchesi, Donatella (Universita e INFN, Padova (IT)) ; Michielin, Emanuele (Universita e INFN, Padova (IT)) ; Spradlin, Patrick (University of Glasgow (GB))
This note describes the implementation and performance of the inclusive charm triggers, based on multivariate techniques, in the LHCb High Level Trigger for LHC Run II data taking..
LHCb-PUB-2017-004; CERN-LHCb-PUB-2017-004.- Geneva : CERN, 2017 - 14. Fulltext: PDF;

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