C. F. Redmer
A5088204838- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- High-Energy Particle Collisions Research
- Dark Matter and Cosmic Phenomena
- Neutrino Physics Research
- Nuclear physics research studies
- Computational Physics and Python Applications
- Black Holes and Theoretical Physics
- Atomic and Subatomic Physics Research
- Particle Detector Development and Performance
- Medical Imaging Techniques and Applications
- Particle Accelerators and Free-Electron Lasers
- Cosmology and Gravitation Theories
- Quantum, superfluid, helium dynamics
- Superconducting Materials and Applications
- Atomic and Molecular Physics
- Scientific Research and Discoveries
- Cellular Automata and Applications
- Radioactive Decay and Measurement Techniques
- Crystallography and Radiation Phenomena
- Advanced Measurement and Metrology Techniques
- Distributed and Parallel Computing Systems
- Stochastic processes and statistical mechanics
- Gamma-ray bursts and supernovae
- Nuclear Physics and Applications
Johannes Gutenberg University Mainz
2015-2025
Institute of High Energy Physics
2018-2023
University of Groningen
2023
Hunan University
2022
Boğaziçi University
2022
Uppsala University
2011-2020
Campbell Collaboration
2014
Forschungszentrum Jülich
2014
University of Delhi
2014
University of Bern
2014
Exclusive and kinematically complete high-statistics measurements of quasifree polarized $\stackrel{\ensuremath{\rightarrow}}{n}p$ scattering have been performed in the energy region narrow resonancelike structure ${d}^{*}$ with $I({J}^{P})=0({3}^{+})$, $M\ensuremath{\approx}2380\text{ }\text{ }\mathrm{MeV}$, $\mathrm{\ensuremath{\Gamma}}\ensuremath{\approx}70\text{ }\mathrm{MeV}$ observed recently double-pionic fusion channels...
The existence of a light dark force mediator has been tested with the KLOE detector at DAPHNE. This particle, called U, is searched for using decay chain phi-->etaU, eta-->pi+pi-pi0, U-->e+e-. No evidence found in 1.5 fb-1 data. resulting exclusion plot covers mass range 5
Exclusive measurements of the quasifree $pn\ensuremath{\rightarrow}pp{\ensuremath{\pi}}^{0}{\ensuremath{\pi}}^{\ensuremath{-}}$ reaction have been performed by means $pd$ collisions at ${T}_{p}$ $=$ 1.2 GeV using wide angle shower apparatus (WASA) detector setup cooler synchrotron COSY (Institut f\"ur Kernphysik, J\"ulich). Total and differential cross sections obtained covering energy region $\sqrt{s}$ (2.35--2.46) GeV, which includes ABC effect its associated resonance structure. No...
New data on quasifree polarized neutron-proton scattering in the region of recently observed ${d}^{*}$ resonance structure are obtained by exclusive and kinematically complete high-statistics measurements with WASA at COSY. This paper details determination beam polarization, checks character process, all ${A}_{y}$ angular distributions new partial-wave analysis, which includes producing a pole ${}^{3}{D}_{3}\ensuremath{-}{}^{3}{G}_{3}$ coupled partial waves...
An exclusive measurement of the excitation function for dd->3Heppi- reaction was performed at Cooler Synchrotron COSY-Juelich with WASA-at-COSY detection system. The data were taken during a slow acceleration beam from 2.185 GeV/c to 2.400 crossing kinematic threshold eta meson production in dd->4He-eta 2.336 GeV/c. corresponding excess energy respect 4He-eta system varied -51.4MeV 22MeV. integrated luminosity experiment determined using dd->3Hen reaction. shape examined. No signal bound...
Exclusive and kinematically complete high-statistics measurements of the double pionic fusion reaction $dd \to ^4$He$\pi^0\pi^0$ have been performed in energy range 0.8 - 1.4 GeV covering thus region ABC effect, which denotes a pronounced low-mass enhancement $\pi\pi$-invariant mass spectrum. The experiments were carried out with WASA detector setup at COSY. Similar to observation basic $pn d \pi^0\pi^0$ reaction, data reveal correlation between effect resonance-like dependence total cross...
Dalitz plot distribution of the $\eta\to\pi^+\pi^-\pi^0$ decay is determined using a data sample $1.2\cdot 10^7$ $\eta$ mesons from $pd\to ^3\textrm{He}\eta$ reaction at 1 GeV collected by WASA detector COSY.
Charge symmetry breaking (CSB) observables are a suitable experimental tool to examine effects induced by quark masses on the nuclear level. Previous high precision data from TRIUMF and IUCF currently used develop consistent description of CSB within framework chiral perturbation theory. In this work studies reaction dd→He4π0 have been extended towards higher excess energies in order provide information contribution p-waves final state. For this, an exclusive measurement has carried out at...
An exclusive measurement of the $dd{\ensuremath{\rightarrow}}^{3}\mathrm{He}n{\ensuremath{\pi}}^{0}$ reaction was carried out at a beam momentum ${p}_{d}=$ 1.2 GeV/$c$ using WASA-at-COSY facility. Information on total cross section as well differential distributions obtained. The data are described by phenomenological approach based combination quasifree model and partial wave expansion for three-body reaction. is found to be...
Differential cross sections have been extracted from exclusive and kinematically complete high-statistics measurements of quasifree polarized $\vec{n}p$ scattering performed in the energy region $d^*(2380)$ dibaryon resonance covering range beam energies $T_n$ = 0.98 - 1.29 GeV ($\sqrt s$ 2.32 2.44 GeV). The experiment was carried out with WASA-at-COSY setup having a deuteron impinged on hydrogen pellet target utilizing process $dp \to np + p_{spectator}$. That way $np$ differential section...
The R value is measured with a total of 14 data points the corresponding center-of-mass energy going from 2.2324 to 3.6710 GeV. statistical uncertainty less than 0.6%. Two different simulation models, LUARLW and new Hybrid generator, are used give consistent detection initial-state radiation corrections. An accuracy better 2.6% below 3.1 GeV 3.0% above achieved for value. precise measurement will be an important constraint precision tests Standard Model, such as calculations anomalous...
Gaseous detectors are used in high energy physics as trackers or, more generally, devices for the measurement of particle position. For this reason, they must provide spatial resolution and have to be able operate regions intense radiation, i.e. around interaction point collider machines. Among these, Micro Pattern Detectors (MPGD) latest frontier allow overcome many limitations pre-existing detectors, such radiation tolerance rate capability. The gas Electron Multiplier (GEM) is a MPGD that...
These are the proceedings of PrimeNet Workshop, held in September 16-18, 2010, at campus Instituto Superior Técnico Lisbon, Portugal. This workshop is part activities project "Study Strongly Interacting Matter" (acronym HadronPhysics2), which an integrating activity Seventh Framework Program EU. HP2 contains several activities, one them being network having focus on Meson Physics Low-Energy QCD. created to exchange information experimental and theoretical ongoing mainly eta eta-prime physics...
Precise measurements of semileptonic kaon decay rates at KLOE provide the measurement CKM mixing matrix element \vus\ and information about lepton universality. Leptonic decays an independent $\abs{\vus}^2/\abs{\vud}^2$, through ratio $Γ(K\toμν)/Γ(π\toμν)$. These measurements, together with result $|\vud|$ from nuclear $β$ transitions, most precise test unitarity, allowing universality quark weak couplings to be tested. After completion data taking, proposal a new run upgraded detector,...
One of the basic motivations KLOE and KLOE-2 collaborations is test fundamental symmetries search for phenomena beyond Standard Model via hadronic leptonic decays ground-state mesons their production in fusion virtual gamma quanta exchanged between colliding electrons positrons. This contribution includes brief description results recent analysis data aimed at (i) dark matter boson, (ii) determination light-by-light contributions to g-2 muon anomaly (iii) tests QCD anomalies.