K. Buesser
- Particle physics theoretical and experimental studies
- High-Energy Particle Collisions Research
- Quantum Chromodynamics and Particle Interactions
- Particle Detector Development and Performance
- Dark Matter and Cosmic Phenomena
- Particle Accelerators and Free-Electron Lasers
- Building energy efficiency and sustainability
- Renewable energy and sustainable power systems
- Particle accelerators and beam dynamics
- Cosmology and Gravitation Theories
- Neutrino Physics Research
- Superconducting Materials and Applications
- International Science and Diplomacy
- Advanced X-ray and CT Imaging
- Black Holes and Theoretical Physics
- Medical Imaging Techniques and Applications
- Twentieth Century Scientific Developments
- Computational Physics and Python Applications
- Distributed and Parallel Computing Systems
- Radiomics and Machine Learning in Medical Imaging
- Advanced X-ray Imaging Techniques
- Scientific Research and Discoveries
- Interdisciplinary Research and Collaboration
- Nuclear physics research studies
- Embedded Systems Design Techniques
Deutsches Elektronen-Synchrotron DESY
2008
Universität Hamburg
1998-2006
Rutherford Appleton Laboratory
2002-2004
The International Linear Collider (ILC) is on the table now as a new global energy-frontier accelerator laboratory taking data in 2030s. ILC addresses key questions for our current understanding of particle physics. It based proven technology. Its experiments will challenge Standard Model physics and provide window to look beyond it. This document brings story up date, emphasizing its strong motivation, readiness construction, opportunity it presents US community.
The ILD detector is proposed for an electron-positron collider with collision centre-of-mass energies from 90~\GeV~to about 1~\TeV. It has been developed over the last 10 years by international team of scientists goal to design and eventually propose a fully integrated detector, primarily International Linear Collider, ILC. In this report fundamental ideas concepts behind are discussed technologies needed realisation reviewed. document starts short review science goals ILC, how can be...
A search for stable and long-lived massive particles of electric charge |Q/e|=1 or fractional charges 2/3, 4/3, 5/3 is reported using data collected by the OPAL detector at LEP, centre-of-mass energies from 130 to 209 GeV. These are assumed be pair-produced in e+e− collisions not interact strongly. No evidence production these was observed. Model-independent upper limits on cross-section between 0.005 0.028 pb have been derived scalar spin-1/2 with ±1. Within framework Constrained Minimal...
Anomalous quartic couplings between the electroweak gauge bosons may contribute to $\ensuremath{\nu}\overline{\ensuremath{\nu}}\ensuremath{\gamma}\ensuremath{\gamma}$ and $q\overline{q}\ensuremath{\gamma}\ensuremath{\gamma}$ final states produced in ${e}^{+}{e}^{\ensuremath{-}}$ collisions. This analysis uses LEP2 OPAL data sample at center-of-mass energies up 209 GeV. Event selections identify events which two photons are reconstructed within detector acceptance. The cross section for...
A search for the single production of doubly-charged Higgs bosons is performed using e+e− collision data collected by OPAL experiment at centre-of-mass energies between 189 GeV and 209 GeV. No evidence existence H±± observed. Upper limits are derived on hee, Yukawa coupling to like-signed electron pairs. 95% confidence level upper limit hee< 0.071 inferred M(H±±)<160 assuming that sum branching fractions all lepton flavour combinations 100%. Additionally, indirect constraints hee from Bhabha...
Non-commutative QED would lead to deviations from the Standard Model depending on a new energy scale Lambda_NC and unique direction in space defined by two angles eta xi. Here this analysis is as angle between rotation axis of earth. The predictions such theory for process e+e- -> gamma are evaluated specific orientation OPAL detector compared measurements. Distributions polar azimuthal scattering used extract limits model parameter eta. At 95% confidence level found be larger than 141 GeV...
A study of W+W- events accomanied by hard photon radiation produced in e+e- collisions at LEP is presented. Events consistent with being two on-shell W bosons and an isolated are selected from 681 pb^-1 data recorded 180 GeV < sqrt(s) 209 GeV. For these data, 187 candidates energies greater than 2.5 The used to determine the W+ W- gamma cross section five values sqrt(s). results Standard Model expectation. These provide constraints on related O(alpha) systematic uncertainties measurement...
The beam delivery system for the linear collider focuses beams to nanometer sizes at its interaction point, collimates halo provide acceptable background in detector and has a provision state-of-the art instrumentation order reach ILC's physics goals. This paper describes design details status of baseline configuration considered reference also lists alternatives.
A search for the Higgsstrahlung process e+e−→hZ is described, where neutral Higgs boson h assumed to decay into hadronic final states. In order be sensitive a broad range of models, performed independent flavour content decay. The analysis based on e+e− collision data collected by OPAL detector at energies between 192 and 209 GeV. does not reveal any significant excess over Standard Model background prediction. Results are combined with previous searches around 91 189 limit set product...
We present the first experimental results based on jet boost algorithm, a technique to select unbiased samples of gluon jets in ${e}^{+}{e}^{\ensuremath{-}}$ annihilations, i.e. free biases introduced by event selection or finding criteria. Our are derived from hadronic ${Z}^{0}$ decays observed with OPAL detector at LEP collider CERN. First, we test algorithm through studies HERWIG Monte Carlo events and find that it provides accurate measurements charged particle multiplicity distributions...