A5027051549- High-Energy Particle Collisions Research
- Quantum Chromodynamics and Particle Interactions
- Particle physics theoretical and experimental studies
- Research Data Management Practices
- Nuclear physics research studies
- Scientific Computing and Data Management
- Nuclear reactor physics and engineering
- Distributed and Parallel Computing Systems
- Particle Detector Development and Performance
- Data Quality and Management
- Medical Imaging Techniques and Applications
- Education Methods and Technologies
- Pulsars and Gravitational Waves Research
- Advanced X-ray Imaging Techniques
- Advanced X-ray and CT Imaging
- Nuclear Physics and Applications
- Electron and X-Ray Spectroscopy Techniques
- Business Process Modeling and Analysis
- Manufacturing Process and Optimization
Max Planck Institute for Nuclear Physics
2025
Goethe University Frankfurt
2015-2024
SURFsara (Netherlands)
2019
We present an analysis of proton number fluctuations in $\sqrt{s_{NN}}$ = 2.4 GeV Au+Au collisions measured with the High-Acceptance DiElectron Spectrometer (HADES) at GSI. With help extensive detector simulations done IQMD transport model events including nuclear clusters, various nuisance effects influencing observed cumulants have been investigated. Acceptance and efficiency corrections applied as a function fine grained rapidity transverse momentum bins, well considering local track...
Flow coefficients $v_{n}$ of the orders $n = 1 - 6$ are measured with High-Acceptance DiElectron Spectrometer (HADES) at GSI for protons, deuterons and tritons as a function centrality, transverse momentum rapidity in Au+Au collisions $\sqrt{s_{NN}} 2.4$ GeV. Combining information from flow all allows to construct first time, collision energies few GeV, multi-differential picture angular emission pattern these particles. It reflects complicated interplay between effect central fireball...
Abstract High-precision measurements of flow coefficients $$v_{n}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msub> <mml:mi>v</mml:mi> <mml:mi>n</mml:mi> </mml:msub> </mml:math> ( $$n = 1 - 4$$ <mml:mrow> <mml:mo>=</mml:mo> <mml:mn>1</mml:mn> <mml:mo>-</mml:mo> <mml:mn>4</mml:mn> </mml:mrow> ) for protons, deuterons and tritons relative to the first-order spectator plane have been performed in Au+Au collisions at $$\sqrt{s_{_{{\text {NN}}}}}= 2.4$$ <mml:msqrt>...
We present data on charged kaons (K+-) and {\phi} mesons in Au(1.23A GeV)+Au collisions. It is the first simultaneous measurement of K central heavy-ion collisions below a kinetic beam energy 10A GeV. The {\phi}/K- multiplicity ratio found to be surprisingly high with value 0.52 +- 0.16 shows no dependence centrality collision. Consequently, different slopes K+ K- transverse-mass spectra can explained solely by feed- down, which substantially softens mesons. Hence, contrast commonly adapted...
We present first data on sub-threshold production of K0 s mesons and Λ hyperons in Au+Au collisions at $\sqrt{s_{NN}}$ = 2.4 GeV. observe an universal scaling hadrons containing strangeness, independent their corresponding thresholds. Comparing the yields, scaling, shapes rapidity pt spectra to state-of-the-art transport model (UrQMD, HSD, IQMD) predictions, we find that none latter can simultaneously describe all observables with reasonable \c{hi}2 values.
We report on the first measurement of $p\mathrm{\ensuremath{\Lambda}}$ and $pp$ correlations via femtoscopy method in $p$ + Nb reactions at $\sqrt{{s}_{\mathit{NN}}}=3.18\phantom{\rule{0.28em}{0ex}}\mathrm{GeV}$, studied with High Acceptance Di-Electron Spectrometer (HADES). By comparing experimental correlation function to model calculations, a source size for pairs...
We present the first observation of K^{-} and ϕ absorption within nuclear matter by means π^{-}-induced reactions on C W targets at an incident beam momentum 1.7 GeV/c studied with HADES SIS18/GSI. The double ratio (K^{-}/K^{+})_{W}/(K^{-}/K^{+})_{C} is found to be 0.319±0.009(stat)_{-0.012}^{+0.014}(syst) indicating a larger in heavier as compared lighter ones. measured ϕ/K^{-} ratios π^{-}+C π^{-}+W acceptance are equal 0.55±0.04(stat)_{-0.07}^{+0.06}(syst)...
We report on the investigation of $\mathrm{\ensuremath{\Delta}}$(1232) production and decay in proton-proton collisions at a kinetic energy 1.25 GeV measured with HADES. Exclusive dilepton channels $pp{e}^{+}{e}^{\ensuremath{-}}$ $pp{e}^{+}{e}^{\ensuremath{-}}\ensuremath{\gamma}$ have been studied compared partial-wave analysis hadronic $pp{\ensuremath{\pi}}^{0}$ channel. They allow to access both...
We present high-statistic data on charged pion emission from Au+Au collisions at $\sqrt{s_{\rm{NN}}}$ = 2.4 GeV (corresponding to $E_{beam}$ 1.23 A GeV) in four centrality classes the range 0 - 40$\%$ of most central collisions. The are analyzed as a function transverse momentum, mass, rapidity, and polar angle. Pion multiplicity per participating nucleon decreases moderately with increasing centrality. angular distributions found be non-isotropic even for event class. Our results fit well...
High-statistics $\pi^-\pi^-$ and $\pi^+\pi^+$ femtoscopy data are presented for Au+Au collisions at $\sqrt{s_\mathrm{NN}}=2.4$ GeV, measured with HADES SIS18/GSI. The experimental correlation functions allow the determination of space-time extent corresponding emission sources via a comparison to models. source, parametrized as three-dimensional Gaussian distribution, is studied in dependence on pair transverse momentum, azimuthal angle respect reaction plane, collision centrality beam...
We investigate identical pion HBT intensity interferometry in central Au + collisions at 1.23A GeV. High-statistics π−π− and π+π+ data are measured with HADES SIS18/GSI. The radius parameters, derived from the correlation function depending on relative momenta longitudinally comoving system parametrized as three-dimensional Gaussian distribution, studied of transverse momentum. A substantial charge-sign difference source radii is found, particularly pronounced low extracted parameters agree...
Pion-induced reactions provide unique opportunities for an unambiguous description of baryonic resonances and their coupling channels by means a partial-wave analysis. Using the secondary pion beam at SIS18, two-pion production in second resonance region has been investigated to unravel role $N(1520){\frac{3}{2}}^{\ensuremath{-}}$resonance intermediate $\ensuremath{\rho}$-meson production. Results on exclusive with one (${\ensuremath{\pi}}^{\ensuremath{-}}p$) two pions...
Abstract Hadron production ( $$\pi ^\pm $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msup> <mml:mi>π</mml:mi> <mml:mo>±</mml:mo> </mml:msup> </mml:math> , proton, $$\Lambda <mml:mi>Λ</mml:mi> $$K_S^0$$ <mml:msubsup> <mml:mi>K</mml:mi> <mml:mi>S</mml:mi> <mml:mn>0</mml:mn> </mml:msubsup> $$K^\pm ) in ^- + \textrm{C}$$ <mml:mrow> <mml:mo>-</mml:mo> <mml:mo>+</mml:mo> <mml:mtext>C</mml:mtext> </mml:mrow> and \textrm{W}$$ <mml:mtext>W</mml:mtext> collisions is investigated...
We report on the investigation of dielectron production in tagged quasi-free neutron-proton collisions by using a deuteron beam kinetic energy 1.25GeV/u impinging liquid hydrogen target. Our measurements with HADES confirm significant excess $e^{+}e^{-}$ pairs above $\pi^{0}$ mass exclusive channel $dp \rightarrow npe^{+}e^{-}(p_{spect})$ as compared to $ ppe^{+}e^{-}$ measured proton-proton at same energy. That points different bremsstrahlung mechanisms. Two models were evaluated for role...
The inclusive production of {\Lambda} hyperons in proton-proton collisions at $\sqrt{s}$ = 3.18 GeV was measured with HADES the GSI Helmholtzzentrum f\"ur Schwerionenforschung Darmstadt. experimental data are compared to a data-based model for individual exclusive channels same reaction. contributions intermediate resonances such as {\Sigma}(1385), {\Delta}++ or N* considered detail. In particular, result partial wave analysis is accounted abundant pK$^+${\Lambda} final state. Model and show...
The production of $\Sigma^{0}$ baryons in the nuclear reaction p (3.5 GeV) + Nb (corresponding to $\sqrt{s_{NN}}=3.18$ is studied with detector set-up HADES at GSI, Darmstadt. $\Sigma^{0}$s were identified via decay $\Sigma^{0} \rightarrow \Lambda \gamma$ subsequent decays $\Lambda \pi^{-}$ coincidence a $e^{+}e^{-}$ pair from either external ($\gamma e^{+} e^{-}$) or internal (Dalitz $\gamma^{*}\rightarrow gamma conversions. differential $\Sigma^0$ cross section integrated over acceptance,...
This work presents the analysis of performance RPC ToF wall HADES, located at GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt. The behavior detector is studied in Au+Au collisions 1.23 AGeV. A main characteristic that all active areas were designed to be electrically shielded order operate high occupancies chambers. Here we show achieved regarding efficiency and timing capabilities different this special design after applied offline corrections data. Also stability intrinsic time...
Hadron modifications in nuclear matter are discussed connection to chiral symmetry restoration and/or hadronic many body effects. Experiments with photon, proton and heavy ion beams used probe properties of hadrons embedded at different temperatures densities. Most the information has been gathered for light vector mesons ρ ω ø. HADES is a second generation experiment operating GSI main aim study in-medium by means dielectron production SIS18/Bevelac energy range. Large acceptance excellent...
We present and discuss recent experimental activities of the HADES collaboration on open hidden strangeness production close or below elementary NN threshold. Special emphasis is put feed-down from ϕ mesons to antikaons, presence Ξ- excess in cold nuclear matter comparison statistical model rates p+p data. The implications for interpretation heavy-ion data are discussed as well.