# Posters

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2021-01-29
12:31
Exhibition - visit circuit: the history of the CERN Data Centre
Exposition - Circuit de visites : l'histoire du Centre de calcul du CERN

 Reference: Poster-2021-1043 Keywords:  computing  history  Data Centre  Centre de calcul  Computing Centre Created: 2020. -10 p Creator(s): Gaillard, Melissa; Perrey, Melissa Loyse These ten panels have been installed in building 49 (corridor linking building 31 to 513) as part of the visit circuit. They give an overview of the history of the CERN Data Centre between CERN's creation and 2020. Languages : French and EnglishCes 10 panneaux ont été installés dans le bâtiment 49 (couloir reliant le bâtiment 31 au bâtiment 513) dans le cadre du circuit de visites. Ils retracent brièvement l'histoire du Centre de calcul du CERN de la création du laboratoire jusqu'à 2020. Langues : anglais et français. Related links:Exhibition area - building 49 - 31 - 513 © CERN Geneva Access to files

2021-01-20
07:35
The track-based alignment of the ALFA Roman Pot detectors of the ATLAS experiment
 Reference: ATL-FWD-PUB-2021-003 Note: PUB Keywords:  ALFA, alignment Created: 2021. -1 p ALFA detector is part of the ATLAS Roman Pot detector dedicated to measure protons scattered at very small angles. ALFA aims to study elastic and diffractive events in special runs with reduced luminosity and optimized beam optics. Precision of the measurement depends on the correct positioning of the ALFA detector with respect to the actual beam position. For this purpose track-based procedure is used which utilizes tracks of beam halo and elastic protons collected during physics data taking. This poster presents results of fast and robust alignment of ALFA detectors during LHC Run 2. The alignment constants are used in analysis of diffractive events and also serve as preliminary values in elastic analysis. Precise measurements of the elastic cross sections required dedicated more precise measurement Original Communication (restricted to ATLAS)Fulltext

2021-01-19
19:50
A study of the proton reconstruction efficiency with the ALFA detector using an overlay technique of Monte Carlo signal events with zero-bias collider data.
 Reference: ATL-FWD-PUB-2021-001 Note: PUB Created: 2021. -mult. p The purpose of the ATLAS Roman Pot (ARP) detector is to measure protons scattered at very small angles. ARP aims to study elastic and diffractive events, exclusive production and photon induced interactions. In LHC Run 2, ARP participated in the ATLAS high-luminosity data taking. In addition, several special runs with reduced luminosity were taken. Any cross section measurement requires good understanding of the particle reconstruction efficiency. This task is particularly complicated in case of forward protons where actual beam condition is important part of the working environment. Modeling of the very forward region in terms of primary particle flux and inactive material producing secondary particle is generally not precise. An overlay technique of MonteCarlo signal events with zero-bias collider data overcomes these difficulties and may provide better understanding of the proton reconstruction efficiency. Proposed plots present results of the proton reconstruction efficiency with the ALFA detector. Original Communication (restricted to ATLAS)Fulltext

2021-01-13
16:24
LHCb - X(3872) production in pp with particle multiplicity
 Reference: Poster-2021-1042 Created: 2021. -5 p Creator(s): Epple, Eliane The last decade of hadron spectroscopy has unveiled a wealth of states that do not have the properties expected of particles composed of 2 or 3 valence quarks. Among the most intriguing of these exotics is the X(3872), which various models attempt to describe as a hadronic molecule, a compact tetraquark, an unexpected charmonium state, or their mixtures. Production in heavy ion collisions, as well as high multiplicity pp collisions, offer a new window on the properties of this poorly understood hadron. In these systems, promptly produced X(3872) hadrons can interact with other particles in the nucleus and/or those produced in the collision. The influence of these interactions on the observed X(3872) yields provides information that can help discriminate between the various models of its structure, as well as give insight into the dynamics of the bulk particles produced in these collisions. With a full range of precision vertexing, tracking, and particle ID capabilities covering 2 to 5 in units of rapidity, the LHCb experiment is especially well suited to measurements of both prompt and non-prompt exotic hadrons.This talk will present new LHCb measurements X(3872) production in highmultiplicity pp collisions through the decay to J/ψπ+π−. Related links:Conference, The VI-th International Conference on the Initial Stages of High-Energy Nuclear Collisions © CERN Geneva Access to files

2020-08-06
16:03
LHCb - The Design and Construction of the LHCb VELO modules
 Reference: Poster-2020-1041 Created: 2019. -1 p Creator(s): Svihra, Peter The construction of the new LHCb Vertex Locator (VELO) detector is presented. The upgraded subsystem will play a crucial role in the tracking during data-taking runs starting in 2021, its main objective locating primary and secondary vertices. Compared to its predecessor, the main advantages are better resolution together with trigger-less readout at the maximal rate of 40 MHz. In total, VELO consists of 52 modules positioned in vacuum along the LHC beampipe, surrounding the interaction point. The modules are populated with 4 hybrid silicon pixel detectors with pixel pitch of 55 $\mu$m. Each of the sensors is read out by 3 VeloPix ASICs with 256x256 pixels. For experiment control and data propagation, sets of front-end hybrids and GBTx ASICs are utilized. The data are then sent through a vacuum feed-through board to an opto-and-power (OPB) board, which is connected to the rest of the experiment via optical fibres. Cooling of the whole module is achieved by phase transition of liquid CO2 using a custom-made silicon micro-channel substrate. The assembly of modules at both University of Manchester (Manchester, UK) and Nikhef (Amsterdam, NL) requires high precision in many aspects, therefore extensive procedures for the large-scale construction and its quality assurance have been deployed. The information during each step is uploaded to the online database and automatically analyzed, providing instantaneous information about quality of both components, performed tasks and whole modules. Final assembly of the whole system then takes place at University of Liverpool (Liverpool, UK) and is then transported to CERN (Geneva, CH). Related links:Conference, IEEE Manchester 2019 © CERN Geneva Access to files

2020-07-22
17:05
Making a Splash - proton–proton collisions EN
Making a Splash - collisions proton-proton EN

 Reference: Poster-2020-1040 Keywords:  opendays2019  ATLAS  making a splash  collisions  education  outreach Created: 2019. -1 p Creator(s): Russell, Heather; Mehlhase, Sascha; Anthony, Katarina Making a Splash - proton–proton collisionsMaking a Splash - collisions proton-proton © CERN Geneva Access to files

2020-07-22
17:04
Making a Splash - proton–proton collisions EN/FR
Making a Splash - collisions proton-proton EN/FR

 Reference: Poster-2020-1039 Keywords:  opendays2019  ATLAS  making a splash  collisions  education  outreach Created: 2019. -1 p Creator(s): Russell, Heather; Mehlhase, Sascha; Anthony, Katarina Making a Splash - proton–proton collisionsMaking a Splash - collisions proton-proton © CERN Geneva Access to files

2020-07-22
17:04
Making a Splash - experiments EN
Making a Splash - expériences EN

 Reference: Poster-2020-1038 Keywords:  opendays2019  ATLAS  making a splash  collisions  education  outreach Created: 2019. -1 p Creator(s): Russell, Heather; Mehlhase, Sascha; Anthony, Katarina Making a Splash - experimentsMaking a Splash - expériences © CERN Geneva Access to files

2020-07-22
17:04
Making a Splash - experiments EN/FR
Making a Splash - expériences EN/FR

 Reference: Poster-2020-1037 Keywords:  opendays2019  ATLAS  making a splash  collisions  education  outreach Created: 2019. -1 p Creator(s): Russell, Heather; Mehlhase, Sascha; Anthony, Katarina Making a Splash - experimentsMaking a Splash - expériences © CERN Geneva Access to files

2020-07-22
17:03
Making a Splash - Experimental Balloon Physics EN
Making a Splash - la physique expérimentale des ballons EN

 Reference: Poster-2020-1036 Keywords:  opendays2019  ATLAS  making a splash  collisions  education  outreach Created: 2019. -1 p Creator(s): Russell, Heather; Mehlhase, Sascha; Anthony, Katarina Making a Splash - Experimental Balloon PhysicsMaking a Splash - la physique expérimentale des ballons © CERN Geneva Access to file

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