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Energy dependence of (1020) meson production in nucleus-nucleus collisions at the CERN SPS
No full textThis paper presents preliminary results from the NA61/SHINE experiment on ϕ meson production in central Ar+Sc collisions at beam momenta of 150A, 75A, and 40A GeV/c (corresponding to √sNN, and 8.8 GeV, respectively). These results include double differential distributions in rapidity (y) and transverse momentum (pT), as well as pT -integrated rapidity distributions and total ϕ yields. Additionally, the widths of the rapidity distributions of ϕ and ϕ/π yield ratios are compared to those from Pb+Pb and p+p reactions. Notably, this work represents the first-ever measurements of ϕ production in a mid-sized system at SPS energies.This paper presents preliminary results from the NA61/SHINE experiment on meson production in central Ar+Sc collisions at beam momenta of 150, 75, and 40 GeV/ (corresponding to = 16.8, 11.9, and 8.8 GeV, respectively). These results include double differential distributions in rapidity () and transverse momentum (), as well as -integrated rapidity distributions and total yields. Additionally, the widths of the rapidity distributions of and yield ratios are compared to those from Pb+Pb and \pp reactions. Notably, this work represents the first-ever measurements of production in a mid-sized system at SPS energies
Visit by Her Excellency Ms Iryna Venediktova, Ambassador of Ukraine
No full textVisit by Her Excellency Ms Iryna Venediktova, Ambassador of Ukraine to the Swiss Confederation and to the Principality of Liechtenstei
Search for a resonance in Mg(n,) cross section to constrain the Ne(,n)Mg neutron source reaction rate
No full textQCD Measurements with the ATLAS Experiment
No full textThe ATLAS experiment has performed a range of QCD measurements in final states with jets. Jet cross-section ratios between inclusive bins of jet multiplicity are measured differentially in variables that are sensitive to either the energy-scale or angular distribution of hadronic energy flow in the final state. Using charged particles inside jets, the Lund plane is reconstructed and measured in top quark pair production, separately for jets from hadronic decays of the W boson and for b-quark jets. A differential measurement of the sub-jet multiplicities in dijet events and a measurement of non-perturbative jet track functions are presented. Finally, properties of the underlying-event are studied in events with strange hadrons reconstructed in minimum-bias collisions data, and used to construct underlying-event observables in azimuthal regions computed relative to the leading charged-particle jet in the event
A new approach for nuclear spin determination via in-source resonance ionisation spectroscopy and yield measurements of neutron deficient radium isotopes
No full textThe roles of the SCAB Nominations and Activities systems in the ATLAS-CERN speakers selection
No full textConsidering CERN’s prosperous environment, developing groundbreaking research in physics, and pushing technology’s barriers, CERN members participate in many talks and conferences every year. However, given that the ATLAS experiment has around 6000 members and more than one could be qualified to present the same talk, the experiment developed metrics to prioritize them. Currently, ATLAS is organized in a tree structure with groups and subgroups, called Activities. Each Activity has responsible members such as the conveners or sub-conveners, project leaders, and activity coordinators. Because of the hierarchy mentioned, the member’s nomination will work its way up the branches, providing the upper levels with input from the lower ones. Previously, this process was not automated and happened through the exchange of spreadsheets, not providing these conveners and coordinators with the big picture of the nominations’ priorities and reasons. To improve this process, two systems were developed by the ATLAS Glance team: Activities and SCAB Nominations. The Activities interface provides a user-friendly view to manage the activities tree structure, the coordinators of each activity, and their allowed actions in the nomination process. The SCAB Nominations interface automates the nomination process of the ATLAS Speakers Committee Advisory Board, allowing all the coordinators to give their nominees priorities, and justify them in comments. These two systems contribute to a more holistic process for selecting collaboration members to present at a specific conference. This contribution delves into their specifications
Mass production of RPC readout panels for ATLAS Phase-II upgrade and RD on thin gas gap production at USTC
No full textIn order to accommodate the High-Luminosity Large Hadron Collider, the current ATLAS Muon system needs a significant upgrade during the Long Shutdown-3. For the muon trigger, three layers of thin-gap Resistive Plate Chambers (RPCs) will be added to the Barrel Inner (BI) region. This new generation of RPCs features a thin-gap design that significantly enhances their rate capabilities. However, it poses significant challenges for detector production, Quality Assurance, and Quality Control.Our Chinese ATLAS group undertook the construction of 912 readout panels, the fabrication of 72 BI gas gaps, and the assembly of 360 singlets for the upgrade.To successfully implement the BI-RPC project in China, we have developed and refined a vacuum-bag-based method for producing honeycomb readout panels in our laboratory.This method is also utilized in the production of readout panels in the Chinese industry. The speed and quality of readout panel production have significantly improved.The procedures for gas gap production and the assembly of RPC singlets are outlined in detail. The gas gaps are treated with oil at a temperature of around degrees Celsius and flushed with heptane before the application of linseed oil. This process can greatly enhance the quality of linseed oiling on the inner surfaces of the Bakelite RPC. The quality of the gas gaps is assessed and the results are very promising
