Centrality determination of Au + Au collisions at 1.23A GeV with HADES

Adamczewski-Musch, J.; Arnold, O.; Behnke, C.; Belounnas, A.; Belyaev, A.; Berger-Chen, J. C.; Biernat, J.; Blanco, A.; Blume, C.; Böhmer, M.; Bordalo, P.; Chernenko, S.; Chlad, L.; Deveaux, C.; Dreyer, J.; Dybczak, A.; Epple, E.; Fabbietti, L.; Fateev, O.; Filip, P.; Fonte, P.; Franco, C.; Friese, J.; Fröhlich, I.; Galatyuk, T.; Garzón, J. A.; Gernhäuser, R.; Golubeva, M.; Greifenhagen, R.; Guber, F.; Gumberidze, M.; Harabasz, S.; Heinz, T.; Hennino, T.; Hlaváč, S.; Höhne, C.; Holzmann, R.; Ierusalimov, A.; Ivashkin, A.; Kämpfer, B.; Karavicheva, T.; Kardan, B.; Köenig, I.; Koenig, W.; Kolb, B. W.; Korcyl, G.; Kornakov, G.; Kötte, R.; Kühn, W.; Куглер, А.; Kunz, T.; Kurepin, A.; Kurilkin, A.; Kurilkin, P. K.; Ladygin, V. P.; Lalik, R.; Lapidus, K.; Lebedev, A.; Lopes, L.; Lorenz, M.; Mahmoud, T.; Maier, L.; Mangiarotti, A.; Markert, J.; Maurus, S.; Metag, V.; Michel, J.; Mihaylov, D. M.; Morozov, S. V.; Müntz, C.; Münzer, Robert Helmut; Naumann, L.; Nowakowski, K.; Pałka, M.; Parpottas, Y.; Pechenov, V.; Pechenova, O.; Petukhov, O.; Pietraszko, J.; Przygoda, W.; Ramos, S.; Ramstein, B.; Reshetin, A.; Rodríguez-Ramos, P.; Rosier, P.; Rost, A.; Sadovsky, A.; Salabura, P.; Scheib, T.; Schuldes, H.; Schwab, E.; Scozzi, F.; Seck, F.; Sellheim, P.; Siebenson, J.; Silva, L.; Sobolev, Yu. G.; Spataro, S.; Ströbele, H.; Stroth, J.; Strzempek, P.; Sturm, Christian; Svoboda, O.; Szala, M.; Tlustý, P.; Traxler, M.; Tsertos, H.; Usenko, E.; Wagner, V.; Wendisch, C.; Wiebusch, M. G.; Wirth, J.; Zanevsky, Y.; Zumbruch, P.

doi:10.1140/epja/i2018-12513-7

Cited by 61 publications

(50 citation statements)

References 17 publications

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“…We simulate central Au+Au collisions with impact parameter b = 0 − 3.4 fm, roughly corresponding to the 0 − 5% centrality class [66,67], from √ s N N = 2.4, GeV to √ s N N = 200 GeV, covering a range of energies relevant for the HADES [68] at GSI, NA49 [69] at CERN and RHIC/BES [70] at BNL experiments. In Table I we provide the details for the coarse graining simulations.…”

Section: Resultsmentioning

confidence: 99%

Temperatures and chemical potentials at kinetic freeze-out in relativistic heavy ion collisions from coarse grained transport simulations

Inghirami

Hillmann

Tomášik

et al. 2020

J. Phys. G: Nucl. Part. Phys.

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Using the UrQMD/coarse graining approach we explore the kinetic freeze-out stage in central Au + Au collisions at various energies. These studies allow us to obtain detailed information on the thermodynamic properties (e.g. temperature and chemical potential) of the system during the kinetic decoupling stage. We explore five relevant collision energies in detail, ranging from √ sNN = 2.4 GeV (GSI-SIS) to √ sNN = 200 GeV (RHIC). By adopting a standard Hadron Resonance Gas equation of state, we determine the average temperature T and the average baryon chemical potential µB on the space-time hyper-surface of last interaction. The results highlight the nature of the kinetic freeze-out as a continuous process. This differential decoupling is an important aspect often missed when summarizing data as single points in the phase diagram as e.g. done in Blast-Wave fits. We compare the key properties of the system derived by using our approach with other models and we briefly review similarities and differences.

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Section: Resultsmentioning

confidence: 99%

Temperatures and chemical potentials at kinetic freeze-out in relativistic heavy ion collisions from coarse grained transport simulations

Inghirami

Hillmann

Tomášik

et al. 2020

J. Phys. G: Nucl. Part. Phys.

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“…As a compromise we use henceforth b = 9 fm to avoid subtleties of certain impact parameter averaging procedures according to weighting ∝ b db. In fact, Table II in [22] attributes the 0 -40 % centrality class (bullets) and the free N N threshold energies of K ± and φ mesons (dashed lines). Right panel:…”

Section: Numerical Results For Au(123 a Gev) + Aumentioning

confidence: 99%

“…8 of [22] indicates that an impact parameter range 7 -11 fm centered at 9 fm corresponds to the centrality class 30 -40 %. (Table II in [22] quotes a mean impact parameter of 8.71 fm for that centrality class.) Therefore, the selection of one "representative impact parameter" must be considered with caution.…”

Section: Numerical Results For Au(123 a Gev) + Aumentioning

confidence: 99%

Dynamical Freeze-Out Phenomena: The Case of K±, φ Transverse Momentum Spectra in Collisions of Au(1.23 A GeV) + Au

Rabe

Kämpfer

2019

Particles

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We argue on a continuous (dynamical) kinetic freeze-out of K ± , φ observed at midrapidity in collisions Au(1.23 A GeV) + Au. The simulations by means of a transport model of BUU type point to time independent transverse momentum slope parameters after 20 fm/c. The complex interplay of expansion dynamics and strangeness production/exchange/absorption as well as elastic scatterings involved in the reaction network does not support the previous interpretation of a late freeze-out of K − due to larger cross sections. 25.75.Dw; 25.75.Ld

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“…The role of a meson is also highlighted by the measurement [13]. It was performed by colliding a deuterium beam with a kinetic energy 1.25 GeV and selecting events with a quasifree neutron through the proton detection in a forward hodoscope.…”

Section: Dileptons In + and +mentioning

confidence: 99%

Exploring Baryon Rich Matter with Heavy-Ion Collisions

Harabasz

2019

Ukr. J. Phys.

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Collisions of heavy nuclei at (ultra-)relativistic energies provide a fascinating opportunity to re-create various forms of matter in the laboratory. For a short extent of time (10-22 s), matter under extreme conditions of temperature and density can exist. In dedicated experiments, one explores the microscopic structure of strongly interacting matter and its phase diagram. In heavy-ion reactions at SIS18 collision energies, matter is substantially compressed (2–3 times ground-state density), while moderate temperatures are reached (T < 70 MeV). The conditions closely resemble those that prevail, e.g., in neutron star mergers. Matter under such conditions is currently being studied at the High Acceptance DiElecton Spectrometer (HADES). Important topics of the research program are the mechanisms of strangeness production, the emissivity of matter, and the role of baryonic resonances herein. In this contribution, we will focus on the important experimental results obtained by HADES in Au+Au collisions at 2.4 GeV center-of-mass energy. We will also present perspectives for future experiments with HADES and CBM at SIS100, where higher beam energies and intensities will allow for the studies of the first-order deconfinement phase transition and its critical endpoint.

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Centrality determination of Au + Au collisions at 1.23A GeV with HADES

Cited by 61 publications

References 17 publications

Temperatures and chemical potentials at kinetic freeze-out in relativistic heavy ion collisions from coarse grained transport simulations

Temperatures and chemical potentials at kinetic freeze-out in relativistic heavy ion collisions from coarse grained transport simulations

Dynamical Freeze-Out Phenomena: The Case of K±, φ Transverse Momentum Spectra in Collisions of Au(1.23 A GeV) + Au

Exploring Baryon Rich Matter with Heavy-Ion Collisions

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