# Posters

Letzte Einträge:
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

2020-07-22
17:01
Making a Splash - Experimental Balloon Physics EN/FR
Making a Splash - la physique expérimentale des ballons EN/FR

 Reference: Poster-2020-1035 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

2020-06-05
16:18
LHCb - Open Heavy-Flavour and $J/\psi$ production in peripheral PbPb collisions at LHCb
 Reference: Poster-2020-1034 Created: 2020. -1 p Creator(s): Belin, Samuel In 2018, LHCb recorded ~210 microbarn$^{-1}$ integrated luminosity of PbPb collisions at $\sqrt(s_{NN})$ = 5.02 TeV. Although limited to peripheral hadronic collisions, this new dataset offers unique opportunities to study simultaneously open and close heavy flavor production, at forward rapidity down to zero pT, at the LHC. Moreover, with an increase of the luminosity by a factor 20 compared to the previous 2015 PbPb dataset, precise measurements on photo-produced charmonia in ultra-peripheral collisions are foreseen. All these measurements are sensitive to and would help to constrain the small-x parton distribution functions (nPDFs) in the target nucleus. Finally, the great momentum resolution of the detector allows to study photo-produced $J/\psi$ in collisions with a nuclear overlap. This new type of prob is sensitive to the geometry of the collisions but also to the electromagnetic field of the Pb nuclei. In this talk, we present the latest results on heavy flavor productions obtained by LHCb measurements in peripheral and ultra-peripheral PbPb collisions. Prospectives on this first results are also discussed. Related links:Conference - 10th edition of the Hard and Electromagnetic Probes © CERN Geneva Access to files

2020-02-25
16:16
Lepton universality tests with Rare Decays at LHCb
 Reference: Poster-2020-1033 Created: 2020. -1 p Creator(s): Moise, Razvan-Daniel Recent measurements of b-hadron decays involving leptons are in tension with the Standard Model (SM). Each of these so-called flavour anomalies diverge by up to 3 standard deviations from their SM predictions. There are various new physics scenarios (e.g. leptoquarks) which can explain the anomalies in a coherent fashion. Although some tensions could be due to theory uncertainties, certain observables are immune to such ambiguities. Such is the case for branching fraction ratios R(H) = B(Xb→H𝜇+𝜇-)/B(Xb→He+e-), where Xb is a beauty hadron, and H is a hadronic system. This poster presents the latest LHCb results on the ratios R(K) [PRL 122 (2019) 191801], R(K*0) [JHEP 08 (2017) 055], and R(pK) [arXiv:1912.08139]. Related links:LHCb poster © CERN Geneva Access to files

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