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LHCb Notes

Letzte Einträge:
2018-05-08
16:51
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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2018-05-03
10:28
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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2018-04-20
11:10
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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2018-03-27
14:15
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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2018-03-23
17:09
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)) ; Ferrari, Fabio (Universita e INFN, Bologna (IT)) ; Stahl, Sascha (CERN) ; Vesterinen, Mika Anton (Ruprecht-Karls-Universitaet Heidelberg (DE)) ; Van Tilburg, Jeroen (Nikhef National institute for subatomic physics (NL))
Pending
LHCb-PUB-2018-004; CERN-LHCb-PUB-2018-004.- Geneva : CERN, 2018

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2018-03-22
11:28
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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2018-03-07
16:04
LHCb Computing Resource usage in 2017 / Bozzi, Concezio (Universita e INFN, Ferrara (IT))
This document reports the usage of computing resources by the LHCb collaboration during the period January 1st – December 31st 2017. The data in the following sections have been compiled from the EGI Accounting portal: https://accounting.egi.eu [...]
LHCb-PUB-2018-002; CERN-LHCb-PUB-2018-002.- Geneva : CERN, 2018 - 34. Fulltext: PDF;

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2018-03-07
16:02
LHCb Computing Resources: 2019 and 2020 requests / Bozzi, Concezio (Universita e INFN, Ferrara (IT))
This document presents the computing resources needed by LHCb in 2019 and 2020, as resulting from the current experience and plans in view of the LHCb upgrade.
LHCb-PUB-2018-001; CERN-LHCb-PUB-2018-001.- Geneva : CERN, 2018 - 11. Fulltext: PDF;

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2017-12-14
15:03
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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2017-12-04
11:33
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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