2,287 research outputs found
The road to the discovery of a Higgs boson in the H→WW(*)→lvlv channel
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112896.pdf (Publisher’s version ) (Open Access)Radboud Universiteit Nijmegen, 25 september 2013Promotor : Groot, N. de Co-promotor : Filthaut, F.132 p
A WH - τνb¯b Higgs search with the DØ detector at the Tevatron or how to find the Higgs at the end of a circular collider
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93599.pdf (Publisher’s version ) (Open Access)Radboud Universiteit Nijmegen, 25 juni 2012Promotor : Jong, S.J. de Co-promotor : Filthaut, F.165 p
A Tauists Hunt for Higgles
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175268.pdf (Publisher’s version ) (Open Access)Radboud University, 25 augustus 2017Promotor : Groot, N. de Co-promotor : Filthaut, F.221 p
On Top of the Higgs: A Measurement of the Higgs Boson Production in Association with Top Quarks
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203087.pdf (Publisher’s version ) (Open Access)Radboud University, 21 mei 2019Promotores : Groot, N. de, Filthaut, F.iii, 248 p
Measurement of σ(pp¯→Z) x BR(Z→bb¯) at √s = 1.96 TeV
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159830.pdf (Publisher’s version ) (Open Access)RU Radboud Universiteit, 24 oktober 2016Promotor : Jong, S.J. de Co-promotor : Filthaut, F.VI, 133 p
The flavour of Dark Matter - A search for Dark Matter in association with a Higgs boson decaying to bottom quarks with the ATLAS detector
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219235.pdf (Publisher’s version ) (Open Access)Radboud University, 05 juni 2020Promotores : Groot, N. de, Filthaut, F.VII, 217 p
Boosted Higgs: A High-Energy Adventure: Measurement of the Higgs boson in decays to bottom quarks at high energy with the ATLAS experiment at the LHC
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324001.pdf (Publisher’s version ) (Open Access)Particle physics is the field of science that tries to understand what the universe is made of at the most fundamental level. Like a building is made of bricks, everything around us, from plants and oceans to stars and people, is made of tiny particles. Particle physicists study what these particles are, how they behave, and how they interact with each other. A key element is the Higgs boson, discovered in 2012, which explains how particles acquire mass. This thesis investigates the Higgs boson produced with high momentum, i.e. boosted regime, in its most probable decay channel into two bottom quarks. Using data collected by the ATLAS experiment at the Large Hadron Collider (LHC), this research improves the precision of Higgs measurements and strengthens the foundation for future discoveries in particle physics.Radboud University, 23 oktober 2025Promotores : Filthaut, F., Pree, T.A. duvi, 219 p
Angular correlations in beauty production at the Tevatron at root s= 1.96 TeV
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26943_angucoinb.pdf (Publisher’s version ) (Open Access)
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33291.pdf (Publisher’s version ) (Open Access)Graduate student Bram Wijngaarden of the Institute of Mathematics, Astrophysics and Particle Physics has studied the production of beauty quarks at the particle accelerator of Fermilab, near Chicago. Beauty quarks are produced in high-energy particle collisions. By measuring the angle between two beauty quarks produced in the same collision, the strong nuclear force can be studied. The beauty quarks quickly decay into other particles. These particles are detected through the electrical signals they make in the detector of the D-zero experiment. Beauty quarks can be distinguished from other particles because of their large mass and their relatively long decay time. In the first-order approximation, the theory predicts that the two beauty quarks always move apart at an angle of 180 degrees. This study shows that in several cases, the angle is much smaller. The second-order approximation predicts this effect but differs quantitatively from the measurement.RU, Experimental High Energy Physics, 22 juni 2005Promotor : Jong, S.J. de Co-promotor : Filthaut, F.179 p
A search for ZH-μμbb production at the Tevatron
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76172.pdf (Publisher’s version ) (Open Access)The Standard Model of particle physics describes with a very good accuracy all interactions of the, so far, known elementary particles.
This thesis presents a search for the Higgs particle, which was not yet put into evidence. The data analyzed consists of 3.1 fb-1 of proton anti-proton collisions at the Tevatron at a center of mass energy of 1.96 TeV recorded by the D0 detector. The search focused on the Higgs associated production with a Z boson. The final signature that was searched was the one in which the Z boson decays into two muons and the Higgs boson decays into two b-quarks.
In order to improve the power of the analysis boosted decision trees are used to increase the separation between signal and background. Not observing an excess over the expected background, limits on the Higgs boson production cross-section at the Tevatron are set.RU Radboud Universiteit Nijmegen, 20 april 2010Promotor : Jong, S.J. de Co-promotor : Filthaut, F.131 p
Cosmic Troubleshooting: Designing supervised autonomy for astronaut – robot coaction in space
No full textSpace exploration has historically driven technological innovation, resulting in significant advancements with applications in various industries on Earth. The exploration of Mars has emerged as a crucial objective, offering opportunities to search for signs of life and gain insights into planetary evolution. However, working on Mars presents numerous challenges, including the lack of a breathable atmosphere, different gravity, extreme temperatures, and the need for infrastructure development. Robots have proven resilient on the Martian surface but still require real-time control and decision-making from ground operators. To address this challenge, a promising solution involves astronauts in orbit around Mars controlling the robots, utilizing high-bandwidth communication techniques and autonomous capabilities.This work focuses on the Surface Avatar project, led by the DLR and ESA, which involves the humanoid robot, Rollin Justin. The project aims to gain valuable insights into the efficient control of robots in future space missions, particularly through collaborative exploration and construction tasks. Rollin Justin, equipped with autonomous capabilities, features a user interface that allows manual controls through various input devices and autonomous operation through interface commands.While the concept of an astronaut-robot pairing shows promise, several challenges remain. Error handling during teleoperation poses a significant issue, as error messages often lack specificity, leaving astronauts confused and without immediate assistance due to the distance between Earth to Mars and the associated communication delays. Limited situational awareness, unfamiliarity with robot constraints, and a large time gap between training and usage further complicate astronaut interactions with the robot. Addressing these problems is critical for optimizing astronaut-robot cooperation and reducing cognitive workload during Mars missions.To address the challenges, this work adopts a research-through-design approach, specifically focusing on user experience research and design. Extensive initial research including sessions at the DLR and literature review, was conducted to identify key issues impacting error-handling capabilities. Based on the research findings, conceptual solutions were developed to address the identified core issues. These concepts were evaluated for feasibility and desirability, considering expert input. Selected concepts were further developed, drawing inspiration from game cues and elements for user interface design. High-fidelity prototypes were created to represent the refined concepts accurately: A third-person perspective including game elements to allow for better situational awareness and a debug page that guides the user through potential error reasons in the moment of an occurring planning error. The prototypes underwent evaluation using various methods, including user sessions at the DLR and a comparative study. The results for both prototypes reveal important enhancements in user experience and a reduction in cognitive workload compared to the existing system. The findings led to informed recommendations for further improvements in the interface design, the robot’s camera setup and the communication of errors to enhance error-handling capabilities for astronauts in future missions. Design for Interactio
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