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LHCb Notes

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Low-$p_T$ dimuon triggers at LHCb in Run 2 / Dettori, Francesco (University of Liverpool (GB)) ; Martinez Santos, Diego (Universidade de Santiago de Compostela (ES)) ; Prisciandaro, Jessica (Universidade de Santiago de Compostela (ES))
The LHCb trigger efficiency for strange hadron decays to final states containing dimuon pairs was substantially improved for Run 2 of the LHC. This note describes the updated strategy, and its impact on the LHCb rare strange physics programme..
LHCb-PUB-2017-023; CERN-LHCb-PUB-2017-023.- Geneva : CERN, 2017 - 11. Fulltext: PDF;

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A vacuum system for the thermal insulation of the SciFi distribution lines and manifolds / Joram, Christian (CERN) ; Pons, Xavier (CERN)
This note describes some calculations and estimates for the layout, technology choice and performance of a vacuum system which shall ensure thermal insulation of the distribution lines and manifolds of the SiPM cooling system of the LHCb SciFi detector. We estimate the heat losses in concentric corrugated stainless steel pipes which leads to the conclusion that the pipes need to be evacuated to a pressure of about 1·10$^{-4}$ mbar. [...]
LHCb-PUB-2017-022; CERN-LHCb-PUB-2017-022.- Geneva : CERN, 2017 - 14. Fulltext: PDF;

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Quality of the spare triple-GEM detectors / Lenci, Rosario (INFN e Laboratori Nazionali di Frascati (IT)) ; Papalino, Giuseppe (INFN e Laboratori Nazionali di Frascati (IT)) ; Paoletti, Emiliano (INFN e Universita Roma Tor Vergata (IT)) ; Pasquali, Luigi (INFN e Universita Roma Tor Vergata (IT)) ; Pinci, Davide (Sapienza Universita e INFN, Roma I (IT)) ; Piscitelli, Carmelo (INFN e Sezione di Roma (IT)) ; Poli Lener, Marco (INFN e Laboratori Nazionali di Frascati (IT)) ; Sciubba, Adalberto (Sapienza Universita e INFN, Roma I (IT)) ; Tskhadadze, Edisher (Joint Inst. for Nuclear Research (RU))
Triple-GEM chambers equip the inner region of the M1 muon station. In order to provide spare detectors in case of problems in the operating ones, new chambers have been assembled at the Frascati National Laboratories of the INFN. [...]
LHCb-PUB-2017-021; CERN-LHCb-PUB-2017-021.- Geneva : CERN, 2017 - 8. Fulltext: PDF;

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Performance of the RASNIK Optical Alignment Monitoring System for the LHCb Outer Tracker Detector / Szczekowski, Marek (National Centre for Nuclear Research (PL)) ; Tuning, Niels (Nikhef National institute for subatomic physics (NL)) ; Ukleja, Artur (National Centre for Nuclear Research (PL)) ; Pellegrino, Antonio (Nikhef National institute for subatomic physics (NL)) ; Hart, Robert (Nikhef National institute for subatomic physics (NL)) ; Syryczynski, Krzysztof (National Centre for NuclearResearch, WARSAW)
We present the results collected by an optical system for position control of the Outer Tracker detector stations in the LHCb experiment. This system has been constructed using the RASNIK three-point alignment monitors. [...]
LHCb-PUB-2017-020; CERN-LHCb-PUB-2017-020.- Geneva : CERN, 2017 - mult.p. Fulltext: PDF;

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LHCb Computing Resources: 2019 requests and reassessment of 2018 requests / Bozzi, Concezio (Universita di Ferrara & INFN (IT))
This document presents the computing resources needed by LHCb in 2019 and a reassessment of the 2018 requests, as resulting from the current experience of Run2 data taking and minor changes in the LHCb computing model parameters..
LHCb-PUB-2017-019; CERN-LHCb-PUB-2017-019.- Geneva : CERN, 2017 - 14. Fulltext: PDF;

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The Hybrid Seeding algorithm for a scintillating fibre tracker at LHCb upgrade: description and performance / Quagliani, Renato (Universite de Paris-Sud 11 (FR)) ; Amhis, Yasmine Sara (Universite de Paris-Sud 11 (FR)) ; Billoir, Pierre (Centre National de la Recherche Scientifique (FR)) ; Polci, Francesco (Centre National de la Recherche Scientifique (FR))
in preparation
LHCb-PUB-2017-018; CERN-LHCb-PUB-2017-018.- Geneva : CERN, 2017

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Signal coupling to embedded pitch adapters in silicon sensors / Artuso, Marina (Syracuse University (US)) ; Betancourt, Christopher (Universitaet Zuerich (CH)) ; Bezshyiko, Iaroslava (Universitaet Zuerich (CH)) ; Blusk, Steven R. (Syracuse University (US)) ; Brundler Denzer, Ruth (Universitaet Zuerich (CH)) ; Bugiel, Szymon (AGH University of Science and Technology (PL)) ; Dasgupta, Roma (AGH University of Science and Technology (PL)) ; Dendek, Adam Mateusz (AGH University of Science and Technology (PL)) ; Dey, Biplab (Central China Normal University CCNU (CN)) ; Ely, Scott Edward (Syracuse University (US)) et al.
We have examined the effects of embedded pitch adapters on signal formation in n-substrate silicon microstrip sensors with data from beam tests and simulation. According to simulation, the presence of the pitch adapter metal layer changes the electric field inside the sensor, resulting in slowed signal formation on the nearby strips and a pick-up effect on the pitch adapter. [...]
LHCb-PUB-2017-017; CERN-LHCb-PUB-2017-017.- Geneva : CERN, 2017

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A study on Scintillating Fiber tracker optimisation for the LHCb upgrade / Piucci, Alessio (Ruprecht-Karls-Universitaet Heidelberg (DE)) ; Mogini, Andrea (Centre National de la Recherche Scientifique (FR)) ; Esen, Sevda (Ruprecht-Karls-Universitaet Heidelberg (DE)) ; Nikodem, Thomas (Ruprecht-Karls-Universitaet Heidelberg (DE))
New tracking stations made from scintillating fibres are designed as a part of the LHCb Upgrade to provide the tracking capabilities in the data-taking environment foreseen after Run II. Due to the higher track multiplicity and higher total integrated radiation dose, larger inefficiencies are found in the simulation compared to the current tracker. [...]
LHCb-PUB-2017-016; CERN-LHCb-PUB-2017-016.- Geneva : CERN, 2017 - 26. Fulltext: 3.PDF;

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First experiences with a parallel architecture testbed in the LHCb trigger system / Gallorini, Stefano (Universita e INFN, Padova (IT)) ; Lucchesi, Donatella (Universita e INFN, Padova (IT)) ; Gianelle, Alessio (Universita e INFN, Padova (IT)) ; Amerio, Silvia (Universita e INFN, Padova (IT)) ; Corvo, Marco (Universita di Ferrara & INFN (IT))
In this note we will discuss the application of new technologies, such as GPU cards, in the current LHCb trigger system. During Run2, a node equipped with a GPU has been inserted in the LHCb online monitoring system. [...]
LHCb-PUB-2017-015; CERN-LHCb-PUB-2017-015.- Geneva : CERN, 2017 - 8 p. - Published in : J. Phys.: Conf. Ser. 898 (2017) 032029 Fulltext: PDF; External link: IOP Open Access Article
In : 22nd International Conference on Computing in High Energy and Nuclear Physics, CHEP 2016, San Francisco, Usa, 10 - 14 Oct 2016, pp.032029

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The Future of RICH Detectors through the Light of the LHCb RICH / D'Ambrosio, C. (CERN) ; Cardinale, R. ; Easo, S. ; Petrolini, A. ; Ullaland, O. /LHCb RICH ; LHCb RICH Collaboration
The limitations in performance of the present RICH system in the LHCb experiment are given by the natural chromatic dispersion of the gaseous Cherenkov radiator, the aberrations of the optical system and the pixel size of the photon detectors. Moreover, the overall PID performance can be affected by high detector occupancy as the pattern recognition becomes more difficult with high particle multiplicities. [...]
LHCB-PUB-2017-014; arXiv:1703.09927; CERN-LHCb-PUB-2017-014.- Geneva : CERN, 2017-12-21 - 4 p. - Published in : Nucl. Instrum. Methods Phys. Res., A 876 (2017) 194-197 Fulltext: PDF; Preprint: PDF;
In : 9th International Workshop on Ring Imaging Cherenkov Detectors, Bled, Slovenia, 5 - 9 Sep 2016, pp.194-197

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