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2019-02-15
14:41
Searches for Long-Lived Particles at LHCb
Reference: Poster-2019-669
Created: 2018. -1 p
Creator(s): Marinangeli, Matthieu

This poster presents three of the latest results on long-lived particles (LLP) searches at LHCb. A search for a LLP decaying to a muon and two jets using 3 fb-1 of pp collision data collected in Run 1, a search for LLP produced in pairs from a standard Higgs boson and decaying to a jet pairs using 2 fb-1 of pp collision data collected in Run 1, and a search for a Drell-Yan dark photon decaying to two muons using 1.6 fb-1 of pp collision data collected in Run 2. No signal was found in each case and upper limits, on the number of expected signal events for the dark photon and the production cross-section for the others, were computed in function of the mass and lifetime of the LLP.

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2019-02-11
15:45
ATLAS Electron and Photon Trigger
Reference: Poster-2019-668
Created: 2019. -1 p
Creator(s): Feng, Minyu

ATLAS electron and photon triggers covering transverse energies from 5 GeV to several TeV are essential to record signals for a wide variety of physics: from Standard Model processes to searches for new phenomena. To cope with ever-increasing luminosity and more challenging pile-up conditions at a centre-of-mass energy of 13 TeV, the trigger selections need to be optimized to control the rates and keep efficiencies high. The ATLAS electron and photon performance during the Run 2 is presented, including new techniques developed to maintain their high performance even in high pile-up conditions.

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2018-12-22
09:57
Trident : An Automated System Tool for Collecting and Analyzing Performance Counters
Reference: Poster-2018-667
Created: 2018. -1 p
Creator(s): Muralidharan, Servesh; Smith, David

Trident, a qualitative analysis tool that can look at various low level metrics with respect to the Core, Memory and I/O to highlight performance bottlenecks during the execution of an application. Trident uses a three pronged approach in analysing a node's utilisation of hardware resources and to help a non system expert understand the stress on different parts of the system by a given job. Currently metrics such as memory bandwidth, core utilization, active processor cycles, etc., are being collected. Interpretation of the data in raw form is often non intuitive. Therefore, the tool converts these data into derived metrics that are then represented as a system wide extended Top-Down analysis that helps developers and site managers likewise understand the application behavior without the need for in-depth expertise of architecture details.

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2018-12-19
15:06
Search for computational workflow synergies in reproducible research data analyses in particle physics and life sciences
Reference: Poster-2018-666
Keywords:  reproducible science  data preservation  data analysis  computational workflows
Created: 2018. -1 p
Creator(s): Šimko, Tibor; Cranmer, Kyle; Crusoe, Michael R; Heinrich, Lukas; Khodak, Anton [...]

We describe the REANA reusable and reproducible research data analysis platform that originated in the domain of particle physics. We integrated support for running Common Workflow Language (CWL) workflows that originated in the domain of life sciences. This integration allowed us to study the applicability of CWL to particle physics analyses and look for synergies in computational practices in the two communities.

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2018-11-16
14:43
The LHCb Upgrade Programme
Reference: Poster-2018-665
Created: 2018. -1 p
Creator(s): Dall'Occo, Elena

This paper will describe the upgrade programmes of the LHCb experiment at the LHC, and the current construction and installation status. The LHCb experiment at the LHC is designed to capture decays of b- and c-hadrons for the study of CP violation and rare decays. It has already had a transformative impact in the field of flavour physics as well as making many general purpose physics measurements in the forward region. At the end of Run-II, many of the LHCb measurements will remain statistically dominated. For this reason the experiment is being upgraded in a first step, dubbed Upgrade I, to run at five times higher luminosity from 2020. The trigger scheme, which currently has a 1 MHz lowest level hardware rate, will be transformed to a strategy whereby the entire experiment is read out at 40 MHz to a software trigger. The increased luminosity and trigger efficiency anticipated at the upgrade will allow a huge increase in precision, in many cases to the theoretical limit, and the ability to perform studies beyond the reach of the current detector. In addition the flexible trigger and unique acceptance opens up opportunities in topics apart from flavour, reinforcing the role of LHCb as a general purpose detector in the forward region. In order to allow the triggerless readout the front end electronics of all subdetectors will be changed, and many subdetectors will be upgraded to cope with the increased occupancy and radiation levels. During the long shutdown between Run 3 and Run 4 the most irradiated parts of the detector will be replaced and other detector consolidation and improvement steps will be carried out. A further major upgrade, dubbed Upgrade II, is proposed for installation during the LHC long shutdown 4. Here major parts of the detector will be replaced and functionality added to enable the detector to run at a further luminosity step of up to 10 times higher than in Upgrade I. It is anticipated to collect more than 300 inverse femtobarn of data at Upgrade II.

Related links:
IEEE NSS/MIC 2018
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2018-11-15
09:46
Increasing Windows security by hardening PC configurations
Reference: Poster-2018-664
Keywords:  CHEP  Security  Hardened PC  Windows  IT-CDA-AD
Created: 2018. -1 p
Creator(s): Martin Zamora, Pablo; Kwiatek, Michal; Bippus, Vincent Nicolas; Cruz Elejalde, Eneko

Over 8000 Windows PCs are actively used on the CERN site for tasks ranging from controlling the accelerator facilities to processing invoices. PCs are managed through CERN's Computer Management Framework and Group Policies, with configurations deployed based on machine sets and a lot of autonomy left to the end-users. While the generic central configuration works well for the majority of the users, a specific hardened PC configuration is now provided for users who require stronger resilience against external attacks.

Related links:
CHEP 2018
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2018-10-12
14:31
Prospects for future upgrade of the LHCb RICH system
Reference: Poster-2018-663
Created: 2018. -1 p
Creator(s): Easo, Sajan

The LHCb experiment has collected data corresponding to 6.9 fb-1 of integrated luminosity since 2010 and the two RICH detectors have been essential for most of the LHCb physics programme. Preparations are underway to install an upgraded RICH detector so that from 2021 onwards LHCb can collect data corresponding to 5 fb-1 of integrated luminosity per year in order to improve the statistical precision of the physics measurements and to search for very rare B-decays and D-decays. For this, the current Level 0 hardware trigger running at 1 MHz will be removed so that detectors can be read out at at the full collision rate of 40 MHz. The long term physics goals of LHCb calls for a further upgrade of the detector system for collecting data corresponding 50 fb-1 of integrated luminosity by 2029 and 300 fb-1 afterwards. The first set of such upgrades are envisaged for the run starting in 2026 where the luminosity in LHCb continues to be 2X1033 cm-2s-1 as in the preceeding years. For the run from 2030 onwards the luminosity in LHCb is planned to be 2X1034 cm-2s-1 and this will result in about 35 interactions per LHC bunch crossing. Hence the detectors would require a major upgrade to cope with the high occupancies resulting from the increased particle multiplicity. Feasibility studies are underway for recording the time of arrival of the RICH hits in addition to their spatial coordinates on the detector plane. The complexity of the event can be reduced by removing hits outside the signal time window and by separating out the hits created by tracks which originated in different primary vertices. Incorporating the RICH hit time information can also improve the performance of the particle identification algorithm.This requires using photon detectors with fast readout. The feasibility of this is expected to be tested using prototypes. Using a photon detector with increased quantum efficiency in the green, like a SiPM(silicon photomultiplier), one can help to improve the chromatic error without reducing the photon yield. Measures to improve the optical configuration of the RICH detectors and to improve their pixel granularity are being investigated. Extending the momentum range to improve the performance in the 1-10 GeV/c range and in the range above 70 GeV/c is also explored. One option for this is to develop novel radiators based on photonic crystals. An overview of all these developments will be presented. This will include the expected performances and the status of the feasibility studies from simulations and prototype testing.

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2018-10-12
14:28
Strategy and Automation of the Quality Assurance Testing of MaPMTs for the LHCb RICH Upgrade
Reference: Poster-2018-662
Created: 2018. -1 p
Creator(s): Gizdov, Konstantin

Strategy and Automation of the Quality Assurance Testing of MaPMTs for the LHCb RICH Upgrade 31 Jul 2018, 10:55 30m Russian Academy of Sciences Board: 25 poster presentation Technological aspects and applications of Cherenkov detectors Poster Session Speaker Konstantin Gizdov (University of Edinburgh) Description The LHCb RICH system will undergo major modifications for the LHCb Upgrade during the Long Shutdown 2 of the LHC, and the current photon detectors will be replaced by Multi Anode PMTs. The operating conditions of the upgraded experiment puts forth significant requirements onto the MaPMTs in terms of their performance, durability & reliability. Presented is an overview of the testing facilities designed and used to vet 3100 units of Hamamatsu 1-inch R13742 and 450 units of Hamamatsu 2-inch R13743 during the short 2 year testing period. Furthermore, discussed are the hardware architecture, the different read-out, power and control components, as well as the novel extensible software framework to steer the procedure. Finally, the operation of four automated stations, that have been deployed in two separate labs, is reported, with each station capable of fully characterising 16 MaMPTs per day.

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2018-10-12
14:16
The micro-Resis7ve WELL detector for the phase 2 upgrade of the LHCb muon detector
Reference: Poster-2018-661
Created: 2018. -1 p
Creator(s): Morello, Gianfranco

he LHCb experiment is a single-arm spectrometer dedicated to the study of the CP viola7on and other rare phenomena in the decay of Beauty par7cles. One of its feature is a fast and versa7le trigger system to select the interes7ng events. The apparatus is designed like a fixed-target experiment due to the very forward peaked b-quark distribu7on at LHC. It is composed of five systems: vertexing, tracking, ring cherenkov detectors, the calorimeters and the muon system. Up to the end of 2017 LHCb has recorded a total luminosity of 7 g-1 and in the next year, since LHC is going to increase its luminosity, the apparatus needs to upgrade its system. For the first phase only the replacement of the FEE will be done. For the phase 2, the detectors should show a rate capability up to 3 MHz/cm2, an efficiency for single gap > 95% within 25 ns (BX), stability up to 6 C/cm2 integrated charge in 10 y at G=4000. So we propose for this upgrade the micro-Resis7ve WELL.

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2018-10-12
14:13
PID Techniques and Performance at LHCb in Run 2
Reference: Poster-2018-660
Created: 2018. -1 p
Creator(s): Hushchyn, Mikhail

Particle identification (PID) plays a crucial role in LHCb analyses. The LHCb PID system is com- posed of two ring-imaging Cherenkov detectors, a series of muon chambers and a calorimeter system. Combining information from these subdetectors allows one to distinguish between various species of long-lived charged and neutral particles. Advanced multivariate techniques are employed to obtain the best PID performance and control systematic uncertainties in a data-driven way. A novel strategy has been introduced in Run 2, where the selection of PID calibration data is implemented in the LHCb software trigger, with further processing achieved through a centralised production that makes highly efficient use of computing resources. This poster covers the major steps of the implementation, and highlights the PID performance achieved in Run 2.

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