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Posters

Najnovije dodano:
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

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Detaljnije - Slični zapisi
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

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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

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Detaljnije - Slični zapisi
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

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Detaljnije - Slični zapisi
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

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Detaljnije - Slični zapisi
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

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Detaljnije - Slični zapisi
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

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Detaljnije - Slični zapisi
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

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Detaljnije - Slični zapisi
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

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2020-02-25
15:31
Prospects for using sub-nanosecond time information to improve the LHCb RICH performance
Reference: Poster-2020-1032
Created: 2020. -1 p
Creator(s): Keizer, Floris

The increase in luminosity during the LHC upgrade programme causes a rise in particle multiplicity and hit occupancy in the LHCb detector. To mitigate this effect for the Ring-Imaging Cherenkov (RICH) detectors, it is proposed to use the photon detector hit time information. The excellent intrinsic time resolution of the RICH detectors of less than 10 ps was demonstrated in the LHCb simulation framework. The FPGA in the RICH detector readout chain includes a programmable time gate of 3 to 6 ns, which will be fine-tuned with the first data in 2021. This nanosecond time gate within the 25 ns readout is unprecedented in the LHC and will reduce background. During Upgrade Ib, the electronic readout chain can be modified or replaced in order to achieve a time resolution around 300 ps. For the high-luminosity environment during LHC Run 5, a further improvement in time resolution to approximately 50 to 100 ps is foreseen. The clear trend of improving particle ID performance with time resolution is presented in this poster.

Related links:
LHCb poster
© CERN Geneva

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