Oliver Freyermuth
A5076781057- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- High-Energy Particle Collisions Research
- Distributed and Parallel Computing Systems
- Atomic and Subatomic Physics Research
- Scientific Computing and Data Management
- Advanced Data Storage Technologies
- Dark Matter and Cosmic Phenomena
- Radiation Detection and Scintillator Technologies
- Parallel Computing and Optimization Techniques
- Superconducting Materials and Applications
- Particle Detector Development and Performance
- Distributed systems and fault tolerance
- Photocathodes and Microchannel Plates
- X-ray Spectroscopy and Fluorescence Analysis
- Advanced Semiconductor Detectors and Materials
- Atomic and Molecular Physics
- Nuclear physics research studies
- Advanced NMR Techniques and Applications
- Nuclear Physics and Applications
- Particle Accelerators and Free-Electron Lasers
- Gamma-ray bursts and supernovae
University of Bonn
2015-2024
Deutsches Archäologisches Institut, Zentrale
2016
The BGOOD photoproduction experiment accesses forward meson angles and low momentum exchange kinematics in the $uds$ sector, which may be sensitive to molecular-like hadron structure. Our results strangeness sector suggest a dominant role of meson-baryon dynamics. This includes structures $K^0\Sigma^0$, $K^+\Sigma^0$ $K^+\Sigma^0(1385)$ residing at $\Sigma^{(*)}K^{(*)}$ thresholds have an equivalence $P_C$ states $\Sigma_C^{(*)}\bar D^{(*)}$ thresholds. In non-strange baryon-baryon...
$K^+\Lambda(1405)$ photoproduction has been studied at the BGOOD experiment via all neutral decay, $\Lambda(1405)\rightarrow\Sigma^0\pi^0$. The unique experimental setup allows both cross section and $\Lambda(1405)$ invariant mass distribution (line shape) to be measured over a broad $K^+$ polar angle range, extending extreme forward angles unattainable previous experiments. Evidence is provided for role of triangle singularity driven by $N^*(2030)$ resonance, which appears contribute...
Abstract $$\gamma p \rightarrow K^{+} \Lambda $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mi>γ</mml:mi> <mml:mi>p</mml:mi> <mml:mo>→</mml:mo> <mml:msup> <mml:mi>K</mml:mi> <mml:mo>+</mml:mo> </mml:msup> <mml:mi>Λ</mml:mi> </mml:mrow> </mml:math> differential cross sections and recoil polarisation data from threshold for extremely forward angles are presented. The measurements were performed at the BGOOD experiment ELSA, utilising high angular momentum...
The γp→K+Σ0 differential cross section at extremely forward angles was measured the BGOOD experiment. A three-quarter drop in strength over a narrow range energy and strong dependence on polar angle of K+ centre-of-mass reaction is observed 1900 MeV. Residing close to multiple open hidden strangeness thresholds, structure appears consistent with meson-baryon threshold effects which may contribute mechanism.
Abstract The BGOOD experiment at the ELSA facility in Bonn has been commissioned within framework of an international collaboration. pursues a systematic investigation non-strange and strange meson photoproduction, particular t -channel processes low momentum transfer. setup uniquely combines central almost $$4\pi $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mn>4</mml:mn><mml:mi>π</mml:mi></mml:mrow></mml:math> acceptance BGO crystal calorimeter with large...
Abstract The differential cross section for the quasi-free photoproduction reaction $$\gamma n\rightarrow K^0\Sigma ^0$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mi>γ</mml:mi> <mml:mi>n</mml:mi> <mml:mo>→</mml:mo> <mml:msup> <mml:mi>K</mml:mi> <mml:mn>0</mml:mn> </mml:msup> <mml:mi>Σ</mml:mi> </mml:mrow> </mml:math> was measured at BGOOD ELSA from threshold to a centre-of-mass energy of $$2400\,\hbox {MeV}$$ <mml:mn>2400</mml:mn> <mml:mspace />...
Abstract High performance and high throughput computing (HPC/HTC) is challenged by ever increasing demands on the software stacks more diverging requirements different research communities. This led to a reassessment of operational concept HPC/HTC clusters at Physikalisches Institut University Bonn. As result, present cluster (named BAF2) introduced various conceptual changes compared conventional clusters. All jobs are now run in containers container-aware resource management system used...
BGO-OD is a newly commissioned experiment to investigate the internal structure of nucleon, using an energy tagged bremsstrahlung photon beam at ELSA electron facility.The setup consists highly segmented BGO calorimeter surrounding target, with particle tracking magnetic spectrometer forward angles.BGO-OD ideal for investigating meson photoproduction.The extensive physics programme open strangeness photoproduction introduced, and preliminary analysis presented.
The BGOOD photoproduction experiment accesses forward meson angles and low momentum exchange kinematics in the uds sector, which may be sensitive to molecular-like hadron structure. Recent results are presented, including strangeness at angles, π 0 co herent off deuteron.
PUNCH4NFDI, funded by the Germany Research Foundation initially for five years, is a diverse consortium of particle, astro-, astroparticle, hadron and nuclear physics embedded in National Data Infrastructure initiative. In order to provide seamless federated access huge variety compute storage systems provided participating communities covering their very needs, Compute4PUNCH Storage4PUNCH concepts have been developed. Both comprise state-of-the-art technologies such as token-based AAI...
The BGOOD photoproduction experiment accesses forward meson angles and low momentum exchange kinematics in the uds sector, which may be sensitive to molecular-like hadron structure. Recent results are presented, including strangeness at angles, π 0 coherent off deuteron.
Since the discovery of Λ(1405), it remains poorly described by conventional constituent quark models, and is a candidate for having an “exotic” meson-baryon or “penta-quark” structure, similar to states recently reported in hidden charm sector. The Λ(1405) can be produced reaction γp K + Λ(1405). pure I=0 decay mode into Σ 0 π prohibited mass-overlapping Σ(1385). Combining large aperture forward magnetic spectrometer central BGO crystal calorimeter, BGO-OD experiment ideally suited measure...
The BGO-OD experiment at the ELSA accelerator facility uses an energy tagged bremsstrahlung photon beam to investigate excitation structure of nucleon. setup consists a highly segmented BGO calorimeter surrounding target, with particle tracking magnetic spectrometer forward angles. is ideal for investigating low momentum transfer processes due acceptance and high resolution In particular, this enables investigation strangeness photoproduction where t-channel exchange mechanisms play...
A Third Party Copy (TPC) mechanism has existed in the pure XRootD storage environment for many years. However, using TPC WLCG presents additional challenges due to diversity of systems involved such as EOS, dCache, DPM and ECHO, requiring that we carefully navigate unique constraints imposed by these their site-specific environments through customized configuration software development. To support multitenant setups seen at sites, X509 based authentication authorization was significantly...
The BGO Rugby Ball is a large solid angle electromagnetic calorimeter now installed in the ELSA Facility Bonn. operating BGO-OD experiment aiming to study meson photoproduction off proton and neutron induced by Bremsstrahlung polarized gamma beam of energies from 0.2 3.2 GeV an intensity 5 × 107 photons per second. scintillating material characteristics photomultiplier read-out make this detector particularly suited for detection medium energy electrons with very good resolution. has been...
BGO-OD is a newly commissioned experiment to investigate the internal structure of nucleon, using an energy tagged bremsstrahlung photon beam at ELSA electron facility. The setup consists highly segmented BGO calorimeter surrounding target, with particle tracking magnetic spectrometer forward angles. ideal for investigating meson photoproduction. extensive physics programme open strangeness photoproduction introduced, and preliminary analysis presented.
The inclusion of opportunistic resources, for example from High Performance Computing (HPC) centers or cloud providers, is an important contribution to bridging the gap between existing resources and future needs by LHC collaborations, especially HL-LHC era. However, integration these poses new challenges often happen in a highly dynamic manner. To enable effective lightweight tools COBalD TARDIS are developed at KIT. In this we report on infrastructure use dynamically offer collaborations...
The BGO-OD experiment at the ELSA accelerator facility uses an energy tagged bremstrahlung photon beam to investigate excitation spectrum of nucleon. setup consists a highly segmented BGO calorimeter surrounding target, with particle tracking magnetic spectrometer forward angles. is ideal for investigating photoproduction hadrons non-zero strangeness. high momentum resolution angles covers kinematic region where t-channel exchange mechanisms play dominant role. Access this low transfer also...
Since the discovery of $Λ(1405)$, it remains poorly described by conventional constituent quark models, and is a candidate for having an "exotic" meson-baryon or "penta-quark" structure, similar to states recently reported in hidden charm sector. The $Λ(1405)$ can be produced reaction $γp \rightarrow K^+Λ(1405)$. pure I=0 decay mode into $Σ^0π^0$ prohibited mass-overlapping $Σ(1385)$. Combining large aperture forward magnetic spectrometer central BGO crystal calorimeter, BGO-OD experiment...
Abstract In recent years Jupyter notebooks have conquered class rooms and some scientists also enjoy their convenience to quickly evaluate ideas check whether a more detailed study is justified. To lower the threshold for getting started with ease sharing collaborative use, offering JupyterHub service tempting. However, such larger science requires compute backend sufficient resources that hundreds of can be run simultaneously. Since resource usage teaching activities typically fluctuates...
The new BGO-OD experiment at the electron accelerator ELSA, of University Bonn, is designed to study reaction dynamics nucleon excitations in meson photoproduction. It consists a central BGO calorimeter with magnetic spectrometer forward direction. physics programme includes measurement polarisation observables using linearly and circularly polarised photon beams. Linear obtained by coherent bremsstrahlung off diamond crystal, circular via from longitudinally electrons. degree linear...
BGO-OD is a new meson photoproduction experiment at the ELSA facility of Bonn University. It aims investigation non strange and baryon excitations, especially designed to be able detect weekly bound meson-baryon type structures. The setup for presented, characteristics photon beam detector performances are shown initial experimental program discussed.
The PUNCH4NFDI consortium brings together scientists from the German particle physics, hadron and nuclear astronomy, astro-particle physics communities to improve management (re-)use of scientific data these interrelated communities. PUNCH sciences have a long tradition building large instruments that are planned, constructed operated by international collaborations. While collaborations typically employ advanced tools for distribution, smaller-scale experiments often suffer very limited...