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LHCb Notes

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LHCb Upgrade Computing Model / Passaleva, Giovanni (Universita e INFN, Firenze (IT))
LHCb-PUB-2018-012; CERN-LHCb-PUB-2018-012.- Geneva : CERN, 2018

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LHCb Computing Resources: 2019/2020 requests and preview of Run 3 computing model / Bozzi, Concezio (Universita e INFN, Ferrara (IT))
This document presents the computing resources needed by LHCb in 2019 and 2020. A preview of the LHCb computing model for Run 3 and beyond is also given [...]
LHCb-PUB-2018-011; CERN-LHCb-PUB-2018-011.- Geneva : CERN, 2018 - 13. Fulltext: PDF;

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Using holistic event information in the trigger / Bourgeois, Dylan (EPFL - Ecole Polytechnique Federale Lausanne (CH)) ; Fitzpatrick, Conor (EPFL - Ecole Polytechnique Federale Lausanne (CH)) ; Stahl, Sascha (CERN)
In order to achieve the data rates proposed for the future Run 3 upgrade of the LHCb detector, new processing models must be developed to deal with the increased throughput. For this reason we aim to investigate the feasibility of purely data-driven 'holistic' methods, with the constraint of introducing minimal computational overhead, hence using only raw detector information. [...]
arXiv:1808.00711; LHCb-PUB-2018-010; CERN-LHCb-PUB-2018-010.- Geneva : CERN, 2018 - 30 p. Fulltext: LHCb-PUB-2018-010 - PDF; 1808.00711 - PDF;

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Physics case for an LHCb Upgrade II / The LHCb Collaboration, LHCb Experiment
The LHCb Upgrade II will fully exploit the flavour-physics opportunities of the HL-LHC, and study additional physics topics that take advantage of the forward acceptance of the LHCb spectrometer. The LHCb Upgrade I will begin operation in 2020. [...]
LHCb-PUB-2018-009; CERN-LHCb-PUB-2018-009.- Geneva : CERN, 2018 - 178. Fulltext: PDF;

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Measurements of the Minimum Bending Radius of Small Diameter Scintillating Plastic Fibres / Gruber, Lukas (CERN) ; Joram, Christian (CERN) ; Vaananen, Mika Petteri (University of Helsinki (FI)) ; Gavardi, Laura (Technische Universitaet Dortmund (DE))
The minimum bending radius of plastic fibres is an important parameter as it determines the geometrical flexibility of the fibres during long-term storage or installation and usage inside detectors. The following document describes measurements of the minimum bending radius of round scintillating plastic fibres with small diameter performed in the context of the LHCb SciFi Tracker project. [...]
LHCb-PUB-2018-008; CERN-LHCb-PUB-2018-008.- Geneva : CERN, 2018 - 8. Fulltext: PDF;

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An X-Ray facility to perform irradiation tests and TID studies on electronics and detectors / Brundu, Davide (Universita e INFN, Cagliari (IT)) ; Cardini, Alessandro (Universita e INFN, Cagliari (IT)) ; Cadeddu, Sandro (Universita e INFN, Cagliari (IT)) ; Wyllie, Ken (CERN) ; Ciambrone, Paolo (INFN e Laboratori Nazionali di Frascati (IT))
The X-Ray irradiation system of the LHCb group, installed in Cagliari, is presented; with a particular focus on the setup configuration and dose rate calibration. The system can be used to perform Total Ionizing Dose (TID) studies for detectors, readout and front-end electronics. [...]
LHCb-PUB-2018-007; CERN-LHCb-PUB-2018-007.- Geneva : CERN, 2018 - 19. Fulltext: PDF;

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Triggering $B_s^0 \to \gamma\gamma$ at LHCb / Benson, Sean (Nikhef National institute for subatomic physics (NL)) ; Puig Navarro, Albert (Universitaet Zuerich (CH))
The trigger strategy used in the search for the $B_s^0 \to \gamma\gamma$ decay in Run 2 is described. A sample of data is also provided, corresponding to 80 pb$^{−1}$ of diphoton candidates collected in 2015..
LHCb-PUB-2018-006; CERN-LHCb-PUB-2018-006.- Geneva : CERN, 2018 - 14. Fulltext: B_gammagamma_dists - ROOT; LHCb-PUB-2018-006 - PDF;

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Upgrade trigger & reconstruction strategy: 2017 milestone / Albrecht, Johannes (Technische Universitaet Dortmund (DE)) ; Billoir, Pierre (Centre National de la Recherche Scientifique (FR)) ; Campora Perez, Daniel Hugo (Universidad de Sevilla (ES)) ; Cattaneo, Marco (CERN) ; Marco, Clemencic (CERN) ; Couturier, Ben (CERN) ; Dziurda, Agnieszka (CERN) ; Fitzpatrick, Conor (EPFL - Ecole Polytechnique Federale Lausanne (CH)) ; Fontana, Marianna (Universita e INFN, Cagliari (IT)) ; Grillo, Lucia (University of Manchester (GB)) et al.
The LHCb collaboration is currently preparing an update of the experiment to take data in Run 3 of the LHC. The dominant feature of this upgrade is a trigger-less readout of the full detector followed by a full software trigger. [...]
LHCb-PUB-2018-005; CERN-LHCb-PUB-2018-005.- Geneva : CERN, 2018 - 31. Fulltext: PDF;

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Measurement of the instrumental asymmetry for $K^{-}\pi^{+}$-pairs at LHCb in Run 2 / Davis, Adam (Tsinghua University (CN)) ; Dufour, Laurent (Nikhef National institute for subatomic physics (NL)) ; Dufour, Laurent (CERN) ; Ferrari, Fabio (Universita e INFN, Bologna (IT)) ; Stahl, Sascha (CERN) ; Van Tilburg, Jeroen (Nikhef National institute for subatomic physics (NL)) ; Vesterinen, Mika Anton (University of Warwick (GB))
The instrumental asymmetry between $K^- \pi^+$ and $K^+ \pi^-$-pairs at the LHCb detector is evaluated using data collected in proton-proton collisions at the LHC at a centre-of-mass energy of $13\mathrm{\,Te\kern -0.1em V}$ in 2015 and 2016. To measure this asymmetry, Cabibbo-favoured $D^+ \to {\kern 0.2em\overline{\kern -0.2em K}{}}{}^0 \pi^+$ and $D^+\to K^- \pi^+\pi^+$ decays are used. [...]
LHCb-PUB-2018-004; CERN-LHCb-PUB-2018-004.- Geneva : CERN, 2018 - 19. Fulltext: PDF;

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Status of HLT1 sequence and path towards 30 MHz / De Cian, Michel (EPFL - Ecole Polytechnique Federale Lausanne (CH)) ; Dziurda, Agnieszka (CERN) ; Gligorov, Vladimir (Centre National de la Recherche Scientifique (FR)) ; Hasse, Christoph (Technische Universitaet Dortmund (DE)) ; Hulsbergen, Wouter (Nikhef National institute for subatomic physics (NL)) ; Latham, Thomas Edward (University of Warwick (GB)) ; Ponce, Sebastien (CERN) ; Quagliani, Renato (Université Paris-Saclay (FR)) ; Schreiner, Henry Fredrick (University of Cincinnati (US)) ; Stemmle, Simon Benedikt (Ruprecht Karls Universitaet Heidelberg (DE)) et al.
We present the current status of the HLT1 reconstruction sequence for the LHCb upgrade, both in terms of the number of events which can be processed per second and the achievable physics performance on a selected range of benchmark modes. We present detailed profiling of the various algorithms, describe the bottlenecks, and outline a strategy towards an HLT1 able to process the LHCb upgrade data at 30 MHz
LHCb-PUB-2018-003; CERN-LHCb-PUB-2018-003.- Geneva : CERN, 2018 - 21. Fulltext: PDF;

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