Search For Long Lived Supersymmetric Particles Using Displaced Vertices With The Atlas Detector At The Lhc
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Search for Long-lived Supersymmetric Particles Using Displaced Vertices with the ATLAS Detector at the LHC
Abstract: The existence of long-lived particles (LLPs) is a common feature in many theories beyond the Standard Model. For example, models with small couplings (i.e. R-parity-violating supersymmetry) and models allowing for decays via highly virtual intermediate states (i.e. Split supersymmetry) predict the presence of LLPs. With lifetimes ranging from picoseconds to nanoseconds, massive LLPs could decay to several electrically charged particles in the inner tracking volume of the ATLAS detector at the Large Hadron Collider, resulting in the reconstruction of a displaced secondary vertex. This thesis presents the first search for high mass, multi-track displaced vertices and multiple energetic jets using the full Run-2 dataset collected by the ATLAS detector, corresponding to an integrated luminosity of 139 fb−1 at s√=13 TeV. The observed event yields are compatible with those expected from background processes. The results are presented as exclusion limits at 95 % confidence level on supersymmetric scenarios with non-zero R-parity violating couplings. This thesis also presents the ATLAS FastTracKer (FTK), which is a hardware-based track finder envisioned to be integrated into the ATLAS trigger system. The trigger system is responsible for selecting interesting events with a high purity at a rate of only 1 kHz. The FTK was designed to provide tracking information of all charged particles with pT>1 GeV in the ATLAS inner detector, which is a powerful discriminant for selecting interesting events. The training of the FTK system to achieve a high track-finding efficiency and the adaptability of the system to new detector conditions is presented. Furthermore, the applicability of the system to select candidate events containing long-lived particles is described
Phenomena Beyond the Standard Model: What Do We Expect for New Physics to Look Like?
Author: Roman Pasechnik
language: en
Publisher: Frontiers Media SA
Release Date: 2020-09-03
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Future Of The Large Hadron Collider, The: A Super-accelerator With Multiple Possible Lives
The Large Hadron Collider (LHC) is the highest energy collider ever built. It resides near Geneva in a tunnel 3.8m wide, with a circumference of 26.7km, which was excavated in 1983-1988 to initially house the electron-positron collider LEP. The LHC was approved in 1995, and it took until 2010 for reliable operation. By now, a larger set of larger integrated luminosities have been accumulated for physics analyses in the four collider experiments: ATLAS, CMS, LHCb and ALICE.The LHC operates with an extended cryogenic plant, using a multi-stage injection system comprising the PS and SPS accelerators (still in use for particle physics experiments at lower energies). The beams are guided by 1232 superconducting high field dipole magnets.Intense works are underway in preparation of the High Luminosity LHC, aimed at upgrading the LHC and detectors for collecting ten times more luminosity, and extending the collider life to the early 2040's. So far, the (HL-)LHC project represents a cumulation of around one hundred thousand person-years of innovative work by technicians, engineers, and physicists from all over the world; probably the largest scientific effort ever in the history of humanity. The book is driven by the realisation of the unique value of this accelerator complex and by the recognition of the status of high energy physics, described by a Standard Model — which still leaves too many questions unanswered to be the appropriate theory of elementary particles and their interactions.Following the Introduction are: three chapters which focus on the initial decade of operation, leading to the celebrated discovery of the Higgs Boson, on the techniques and physics of the luminosity upgrade, and finally on major options - of using the LHC in a concurrent, power economic, electron-hadron scattering mode, when upgraded to higher energies or eventually as an injector for the next big machine. The various technical and physics chapters, provided by 61 authors, characterise the fascinating opportunities the LHC offers for the next two decades ahead (possibly longer), with the goal to substantially advance our understanding of nature.