Oliver Freyermuth
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View article: Lohengrin — a proposed experiment in the search for dark bremsstrahlung and a portal to the dark sector
Lohengrin — a proposed experiment in the search for dark bremsstrahlung and a portal to the dark sector Open
View article: A proposal for the Lohengrin experiment to search for dark sector particles at the ELSA Accelerator
A proposal for the Lohengrin experiment to search for dark sector particles at the ELSA Accelerator Open
View article: Energy efficiency trends in HPC: what high-energy and astrophysicists need to know
Energy efficiency trends in HPC: what high-energy and astrophysicists need to know Open
The growing energy demands of High Performance Computing (HPC) systems have made energy efficiency a critical concern for system developers and operators. However, HPC users are generally less aware of how these energy concerns influence t…
View article: Accounting of Computing Resources with AUDITOR
Accounting of Computing Resources with AUDITOR Open
New strategies for the provisioning of compute resources, e.g. in the form of dynamically integrated resources enabled by the COBalD/TARDIS software toolkit, require a new approach of collecting accounting data. AUDITOR, a flexible and exp…
View article: Latest Developments of the PUNCH4NFDI Compute and Storage Infrastructures
Latest Developments of the PUNCH4NFDI Compute and Storage Infrastructures Open
The PUNCH4NFDI consortium, funded by the German Research Foundation for an initial period of five years, gathers various physics communities - particle, astro-, astroparticle, hadron and nuclear physics - from different institutions embedd…
View article: The BGOOD experiment at ELSA, exotic structures in the light quark sector?
The BGOOD experiment at ELSA, exotic structures in the light quark sector? Open
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 photo…
View article: Federated Heterogeneous Compute and Storage Infrastructure for the PUNCH4NFDI Consortium
Federated Heterogeneous Compute and Storage Infrastructure for the PUNCH4NFDI Consortium Open
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 the National Research Data Infrastructure initiative. In ord…
View article: The BGOOD experiment at ELSA, exotic structures in the light quark sector?
The BGOOD experiment at ELSA, exotic structures in the light quark sector? Open
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 photo…
View article: Measurement of the $$\gamma n\rightarrow K^0\Sigma ^0$$ differential cross section over the $$K^*$$ threshold
Measurement of the $$\gamma n\rightarrow K^0\Sigma ^0$$ differential cross section over the $$K^*$$ threshold Open
View article: Distributed Computing and Storage Infrastructure for PUNCH4NFDI
Distributed Computing and Storage Infrastructure for PUNCH4NFDI Open
The PUNCH4NFDI consortium brings together scientists from the German particle physics, hadron and nuclear physics, astronomy, and astro-particle physics communities to improve the management and (re-)use of scientific data from these inter…
View article: The BGOOD experiment at ELSA
The BGOOD experiment at ELSA Open
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 photo…
View article: Photoproduction of K+Λ(1405)→K+π0Σ0 extending to forward angles and low momentum transfer
Photoproduction of K+Λ(1405)→K+π0Σ0 extending to forward angles and low momentum transfer Open
View article: The BGOOD experiment at ELSA Exotic structures in the strange quark sector?
The BGOOD experiment at ELSA Exotic structures in the strange quark sector? Open
The BGOOD photoproduction experiment accesses forward meson angles and low momentum exchange kinematics in the uds sector, which may be sensitive to molecular-like hadronic structure. Recent highlights are summarised in these proceedings.
View article: Unleashing JupyterHub: Exploiting Resources Without Inbound Network Connectivity Using HTCondor
Unleashing JupyterHub: Exploiting Resources Without Inbound Network Connectivity Using HTCondor Open
In recent years Jupyter notebooks have conquered class rooms and some scientists also enjoy their convenience to quickly evaluate ideas and check whether a more detailed study is justified. To lower the threshold for getting started with J…
View article: Measurement of the $γn\rightarrow K^0Σ^0$ differential cross section over the $K^*$ threshold
Measurement of the $γn\rightarrow K^0Σ^0$ differential cross section over the $K^*$ threshold Open
The differential cross section for the quasi-free photoproduction reaction $γn\rightarrow K^0Σ^0$ was measured at BGOOD at ELSA from threshold to a centre-of-mass energy of 2400 MeV. Close to threshold the results are consistent with exist…
View article: Photoproduction of $K^+\Lambda(1405) \rightarrow K^+\pi^0\Sigma^0$ extending to forward angles and low momentum transfer
Photoproduction of $K^+\Lambda(1405) \rightarrow K^+\pi^0\Sigma^0$ extending to forward angles and low momentum transfer Open
$K^+\Lambda(1405)$ photoproduction has been studied at the BGOOD experiment via the all neutral decay, $\Lambda(1405)\rightarrow\Sigma^0\pi^0$. The unique BGOOD experimental setup allows both the cross section and $\Lambda(1405)$ invariant…
View article: Observation of a cusp-like structure in the γp → K+Σ0 cross section at forward angles and low momentum transfer
Observation of a cusp-like structure in the γp → K+Σ0 cross section at forward angles and low momentum transfer Open
The $\gamma p \rightarrow K^+\Sigma^0$ differential cross section at extremely forward angles was measured at the BGOOD experiment. A three-quarter drop in strength over a narrow range in energy and a strong dependence on the polar angle o…
View article: Operating an HPC/HTC Cluster with Fully Containerized Jobs Using HTCondor, Singularity, CephFS and CVMFS
Operating an HPC/HTC Cluster with Fully Containerized Jobs Using HTCondor, Singularity, CephFS and CVMFS Open
High performance and high throughput computing (HPC/HTC) is challenged by ever increasing demands on the software stacks and more and more diverging requirements by different research communities. This led to a reassessment of the operatio…
View article: Transparent Integration of Opportunistic Resources into the WLCG Compute Infrastructure
Transparent Integration of Opportunistic Resources into the WLCG Compute Infrastructure Open
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 the LHC collaborations,…
View article: Strangeness photoproduction at the BGO-OD experiment
Strangeness photoproduction at the BGO-OD experiment Open
The BGO-OD experiment at the University of Bonn's ELSA accelerator facility in Germany is ideally suited to investigate photoproduction at extreme forward angles. It combines a highly segmented BGO electromagnetic calorimeter at central an…
View article: $K^+Λ$(1405) photoproduction at the BGO-OD experiment
$K^+Λ$(1405) photoproduction at the BGO-OD experiment Open
Since the discovery of the $Λ(1405)$, it remains poorly described by conventional constituent quark models, and it is a candidate for having an "exotic" meson-baryon or "penta-quark" structure, similar to states recently reported in the hi…
View article: $K^+\Lambda$(1405) photoproduction at the BGO-OD experiment
$K^+\Lambda$(1405) photoproduction at the BGO-OD experiment Open
Since the discovery of the $\\Lambda(1405)$, it remains poorly described by\nconventional constituent quark models, and it is a candidate for having an\n"exotic" meson-baryon or "penta-quark" structure, similar to states recently\nreported…
View article: Cusp-like structure in the $\gamma p \rightarrow K^+\Sigma^0$ cross section at low momentum transfer
Cusp-like structure in the $\gamma p \rightarrow K^+\Sigma^0$ cross section at low momentum transfer Open
Differential cross section data for $\gamma p \rightarrow K^+\Sigma^0$ has been measured at the BGOOD experiment for extremely forward angles. A three quarter drop in strength over a narrow range in energy and strong dependence on polar an…
View article: The BGOOD experimental setup at ELSA
The BGOOD experimental setup at ELSA Open
View article: XRootD Third Party Copy for the WLCG and HLLHC
XRootD Third Party Copy for the WLCG and HLLHC Open
A Third Party Copy (TPC) mechanism has existed in the pure XRootD storage environment for many years. However, using the XRootD TPC in the WLCG environment presents additional challenges due to the diversity of the storage systems involved…
View article: Strangeness Photoproduction at the BGO-OD experiment
Strangeness Photoproduction at the BGO-OD experiment Open
The BGO-OD experiment at the ELSA accelerator facility uses an energy tagged bremsstrahlung photon beam to investigate the excitation structure of the nucleon. The setup consists of a highly segmented BGO calorimeter surrounding the target…
View article: Erratum to: Strangeness Photoproduction at the BGO-OD Experiment
Erratum to: Strangeness Photoproduction at the BGO-OD Experiment Open
erratum
View article: <i>K</i><sup>0</sup><i><sub>S</sub></i>Σ<sup>0</sup> photoproduction at the BGO-OD experiment
<i>K</i><sup>0</sup><i><sub>S</sub></i>Σ<sup>0</sup> photoproduction at the BGO-OD experiment Open
The BGO-OD experiment at the ELSA accelerator facility uses an energy tagged bremsstrahlung photon beam to investigate the excitation structure of the nucleon via meson photoproduction. The setup with a BGO calorimeter surrounding the targ…
View article: <i>K</i><sup>+</sup>Λ(1405) photoproduction at the BGO-OD experiment
<i>K</i><sup>+</sup>Λ(1405) photoproduction at the BGO-OD experiment Open
Since the discovery of the Λ(1405), it remains poorly described by conventional constituent quark models, and it is a candidate for having an “exotic” meson-baryon or “penta-quark” structure, similar to states recently reported in the hidd…
View article: η’ beam asymmetry at threshold using the BGO-OD experiment
η’ beam asymmetry at threshold using the BGO-OD experiment Open
The unexpected nodal structure of the beam asymmetry recently reported by the GRAAL collaboration in η′ photoproduction very close to threshold could be explained by a previously unobserved narrow resonance. The BGO-OD experiment is ideall…