| 1. |
- Eerola, Paula, et al.
(författare)
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Accelerator-based infrastructures in the fields of particle and nuclear physics
- 2020
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Rapport (övrigt vetenskapligt/konstnärligt)abstract
- The Council for Research Infrastructures (RFI) within the Swedish Research Council (Vetenskapsrådet) commits a significant part of its annual budget to accelerator-based infrastructures in particle and nuclear physics. The funding covers membership fees, running costs and investments. The Swedish activities in these fields are mainly focused on CERN (Geneva, Switzerland) and FAIR (Darmstadt, Germany). In 2019, RFI decided to commission an investigation and landscape analysis of the research infrastructures they fund in these fields. The report is meant to support the Council’s work in ensuring that these funds are strategically well-spent and of maximum benefit to the research community. A panel of seven experts from the Nordic countries have worked on the task with the aid of data from relevant documentation, hearings, interviews and questionnaires. The report contains several concrete recommendations given from the authors to RFI.
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| 2. |
- Strandberg, Sara, 1977-
(författare)
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Measurements of the Top Quark Pair Production Cross Section and an Estimate of the DØ Silicon Detector Lifetime
- 2007
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Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- This thesis presents two measurements of the top quark pair production cross section at sqrt{s} = 1.96 TeV using data from the DØ experiment. Both measurements are performed in the dilepton final state and make use of secondary vertex b-tagging. With 158 pb-1 of data in the electron-muon final state, the measured cross section is:σ(top-antitop) = 11.1 +5.8 -4.3 (stat) +- 1.4 (syst) +- 0.7 (lumi) pb.With 425 pb-1 of data in the electron+track and muon+track final states, the measured cross section is:sigma(top-antitop) = 6.3 +2.1 -1.8 (stat) +- 1.1 (syst) +- 0.4 (lumi) pb.Both measurements are in agreement with the prediction from perturbative QCD calculations. In addition, an estimate of the DØ silicon detector lifetime is presented. The radiation damage is determined by studying the depletion voltage of the silicon sensors as a function of time. Based on this data the silicon detector is estimated to remain operational up to delivered luminosities of 6-8 fb-1.
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| 3. |
- Åkesson, Torsten, et al.
(författare)
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A primary electron beam facility at CERN — eSPS : Conceptual design report
- 2020. - Yellow Reports
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Rapport (övrigt vetenskapligt/konstnärligt)abstract
- The design of a primary electron beam facility at CERN is described. The study has been carried out within the framework of the wider Physics Beyond Colliders study. It re-enables the Super Proton Synchrotron (SPS) as an electron accelerator, and leverages the development invested in Compact Linear Collider (CLIC) technology for its injector and as anaccelerator research and development infrastructure. The facility would be relevant for several of the key priorities in the 2020 update of the European Strategy for Particle Physics, such as an electron-positron Higgs factory, accelerator R&D, dark sector physics, andneutrino physics. In addition, it could serve experiments in nuclear physics. The electron beam delivered by this facility would provide access to light dark matter production significantly beyond the targets predicted by a thermal dark matter origin, and for natures of dark matter particles that are not accessible by direct detection experiments. It would also enable electro-nuclear measurements crucial for precise modelling the energy dependence of neutrino-nucleus interactions, which is needed to precisely measure neutrino oscillations as a function of energy. The implementation of the facility is the natural next step in the development of X-band high-gradient acceleration technology, a key technology for compact and cost-effective electron/positron linacs. It would also become the only facility with multi-GeV drive bunches and truly independent electron witness bunches for plasma wakefield acceleration. A second phase capable to deliver positron witness bunches would make it a complete facility for plasma wakefield collider studies. The facility would be used for the development and studies of a large number of components and phenomena for a future electron-positron Higgs and electroweak factory as the first stage of a next circular collider at CERN, and its cavities in the SPS would be the same type as foreseen for such a future collider. The operation of the SPS with electrons would train a new generation of CERN staff on circular electron accelerators. The facility could start operation in about five years, and would operate in parallel and without interference with Run 4 of the LHC.
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