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5 results on '"Behruz Kardan"'

1. Feeddown contributions from unstable nuclei in relativistic heavy-ion collisions

Author

Volodymyr Vovchenko, Benjamin Dönigus, Behruz Kardan, Manuel Lorenz, and Horst Stoecker

Subjects
Statistical model, Light nuclei production, Excited nuclei, Physics, QC1-999
Abstract

We estimate the feeddown contributions from decays of unstable A=4 and A=5 nuclei to the final yields of protons, deuterons, tritons, 3He, and 4He produced in relativistic heavy-ion collisions at sNN>2.4 GeV, using the statistical model. The feeddown contribution effects do not exceed 5% at LHC and top RHIC energies due to the large penalty factors involved, but are substantial at intermediate collision energies. We observe large feeddown contributions for tritons, 3He, and 4He at sNN≲10 GeV, where they may account for as much as 70% of the final yield at the lower end of the collision energies considered. Sizable (>10%) effects for deuteron yields are observed at sNN≲4 GeV. The results suggest that the excited nuclei feeddown cannot be neglected in the ongoing and future analysis of light nuclei production at intermediate collision energies, including HADES and CBM experiments at FAIR, NICA at JINR, RHIC beam energy scan and fixed-target programmes, and NA61/SHINE at CERN. We further show that the freeze-out curve in the T-μB plane itself is affected significantly by the light nuclei at high baryochemical potential.

Published
2020
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2. New results on light nuclei, hyperons and hypernuclei from HADES (HADES collaboration)

Author

Rayane Abou Yassine, Jörn Adamczewski-Musch, Marten Becker, Philip Bergmann, Alberto Blanco, Christoph Blume, Lukas Chlad, Petr Chudoba, Izabela Ciepał, Malte Cordts, Jörn Dreyer, Waleed Ahmed Esmail, Miroslaw Firlej, Tomasz Fiutowski, Henrik Floersheimer, Paulo Fonte, Jürgen Friese, Ingo Fröhlich, Jörg Förtsch, Tetyana Galatyuk, Tomasz Gniazdowski, Robert Greifenhagen, Mateusz Grunwald, Dieter Grzonka, Malgorzata Gumberidze, Szymon Harabasz, Thorsten Heinz, Claudia Höhne, Fatima Hojeij, Romain Holzmann, Holger Huck, Marek Idzik, Burkhard Kämpfer, Karl-Heinz Kampert, Behruz Kardan, Vadym Kedych, Ilse Koenig, Wolfgang Koenig, Marvin Kohls, Jedrzej Kolas, Grzegorz Korcyl, Georgy Kornakov, Frederic Kornas, Roland Kotte, Wilhelm Krueger, Andrej Kugler, Pawel Kulessa, Rafal Lalik, Semen Lebedev, Sergey Linev, Luís Lopes, Manuel Lorenz, Akshay Malige, Jochen Markert, Tomasz Matulewicz, Johan Messchendorp, Volker Metag, Jan Michel, Aleksandra Molenda, Jakub Moron, Christian Müntz, Marvin Nabroth, Lothar Naumann, Jan Orliński, Jan-Hendrik Otto, Yannis Parpottas, Mirco Parschau, Christian Pauly, Vladimir Pechenov, Olga Pechenova, Gabriela Perez Andrade, Dennis Pfeifer, Krzysztof Piasecki, Jerzy Pietraszko, Tetiana Povar, Alexandr Prozorov, Witold Przygoda, Krzysztof Pysz, Béatrice Ramstein, Narendra Rathod, James Ritman, Adrian Rost, Anar Rustamov, Piotr Salabura, Joao Saraiva, Susan Schadmand, Niklas Schild, Erwin Schwab, Florian Seck, Ilya Selyuzhenkov, Udai Singh, Leon Skorpil, Jerzy Smyrski, Manfred Sobiella, Stefano Spataro, Simon Spies, Maria Stefaniak, Herbert Ströbele, Joachim Stroth, Konrad Sumara, Ondřej Svoboda, Krzysztof Swientek, Melanie Szala, Pavel Tlusty, Michael Traxler, Haralabos Tsertos, Vladimir Wagner, Mateusz Wasiluk, Adrian Amatus Weber, Christian Wendisch, Peter Wintz, Hanna Zbroszczyk, Elizaveta Zherebtsova, Marcin Zielinski, and Peter Zumbruch

Abstract

In March 2019 the HADES experiment recorded 14 billion Ag+Ag collisions at √sNN = 2.55 GeV as a part of the FAIR phase-0 physics program. In this contribution, we present and investigate our capabilities to reconstruct and analyze weakly decaying strange hadrons and hypernuclei emerging from these collisions. The focus is put on measuring the mean lifetimes of these particles.

Published
2022
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3. Collective flow measurements with HADES in Au+Au collisions at 1.23A GeV

Author

Behruz Kardan, Luis Lopes, and Alberto Blanco

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, 010308 nuclear & particles physics, Nuclear Theory, Elliptic flow, Hadron, 01 natural sciences, Nuclear physics, Pion, Flow (mathematics), Harmonics, 0103 physical sciences, High Energy Physics::Experiment, Neutron, Nuclear Experiment, 010306 general physics
Abstract

HADES has a large acceptance combined with a good mass-resolution and therefore allows the study of dielectron and hadron production in heavy-ion collisions with unprecedented precision. With the statistics of seven billion Au-Au collisions at 1.23A GeV recorded in 2012, the investigation of higher-order flow harmonics is possible. At the BEVALAC and SIS18 directed and elliptic flow has been measured for pions, charged kaons, protons, neutrons and fragments, but higher-order harmonics have not yet been studied. They provide additional important information on the properties of the dense hadronic medium produced in heavy-ion collisions. We present here a high-statistics, multidifferential measurement of v 1 and v 2 for protons in Au+Au collisions at 1.23A GeV.

Published
2017
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4. Probing dense baryon-rich matter with virtual photons

Author

I. Koenig, J. Dreyer, Alexander Belyaev, Yiannis Parpottas, Christian Sturm, Alexey Kurepin, M. Szala, Andrey Reshetin, Christoph Blume, Yu.V. Zanevsky, Vladimir Pechenov, F.F. Guber, F. Seck, Eliane Epple, L. Silva, D. M. Mihaylov, A. Kugler, L. Lopes, V. P. Ladygin, K. Nowakowski, A. Mangiarotti, Joachim Stroth, S. Spies, A. Sadovsky, Laura Fabbietti, P. Rodriguez-Ramos, B. W. Kolb, A.P. Ierusalimov, V. Wagner, T. Scheib, J. Pietraszko, Olga Pechenova, H. Tsertos, M. Boehmer, C. Muentz, V. Metag, P. Rosier, P. Bordalo, R. Gernhaeuser, A. Dybczak, S. Maurus, S. Spataro, C. Hoehne, B. Ramstein, R. Muenzer, T. Mahmoud, J. C. Berger-Chen, Sergey V. Morozov, M. Lorenz, Malgorzata Gumberidze, L. Maier, D. Dittert, Tetyana Galatyuk, P. Sellheim, Oliver Werner Arnold, Behruz Kardan, H. Stroebele, R. Holzmann, S. Hlavac, A. Rost, S. Ramos, P. Salabura, G. Korcyl, J. A. Garzón, R. Lalik, A. K. Kurilkin, Yu. G. Sobolev, Jörn Adamczewski-Musch, Marek Palka, Wolfgang Koenig, Tatiana Karavicheva, Ilya Selyuzhenkov, Erwin Schwab, J. Siebenson, C. Behnke, T. Hennino, P. K. Kurilkin, P. Filip, M. G. Wiebusch, B. Kaempfer, E. Usenko, P. Strzempek, O. Petukhov, J. Biernat, A. Blanco, P. Fonte, H. Schuldes, A. Ivashkin, Torsten Heinz, L. Chlad, R. Kotte, F. Scozzi, O. V. Fateev, C. Franco, I. Froehlich, Peter Zumbruch, S. Harabasz, A. Lebedev, G. Kornakov, A. Belounnas, M. Traxler, Jochen Markert, Christian Wendisch, C. Deveaux, R. Greifenhagen, L. Naumann, O. Svoboda, Witold Przygoda, J. Friese, T. Kunz, M.B. Golubeva, P. Tlusty, Kirill Lapidus, S. P. Chernenko, J. Michel, J. Wirth, Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), HADES, and Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Big Bang, radiation: electromagnetic, Photon, heavy ion: scattering, Strong interaction, General Physics and Astronomy, Virtual particle, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, 7. Clean energy, 010305 fluids & plasmas, Nuclear physics, decoupling, pressure, photon: emission, 0103 physical sciences, 010306 general physics, neutron star, QCD matter, quantum chromodynamics: matter, Quantum chromodynamics, Physics, electron positron, matter: strong interaction, High Energy Physics::Phenomenology, big bang, Baryon, 13. Climate action, Quark–gluon plasma, spectral, High Energy Physics::Experiment, photon: virtual
Abstract

International audience; About 10 μs after the Big Bang, the universe was filled—in addition to photons and leptons—with strong-interaction matter consisting of quarks and gluons, which transitioned to hadrons at temperatures close to kT = 150 MeV and densities several times higher than those found in nuclei. This quantum chromodynamics (QCD) matter can be created in the laboratory as a transient state by colliding heavy ions at relativistic energies. The different phases in which QCD matter may exist depend for example on temperature, pressure or baryochemical potential, and can be probed by studying the emission of electromagnetic radiation. Electron–positron pairs emerge from the decay of virtual photons, which immediately decouple from the strong interaction, and thus provide information about the properties of QCD matter at various stages. Here, we report the observation of virtual photon emission from baryon-rich QCD matter. The spectral distribution of the electron–positron pairs is nearly exponential, providing evidence for a source of temperature in excess of 70 MeV with constituents whose properties have been modified, thus reflecting peculiarities of strong-interaction QCD matter. Its bulk properties are similar to the dense matter formed in the final state of a neutron star merger, as apparent from recent multimessenger observation.

Published
2019
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5. Flow harmonics of Au+Au collisions at 1.23 AGeV with HADES

Author

Behruz Kardan

Subjects
Physics, History, Particle physics, 010308 nuclear & particles physics, media_common.quotation_subject, Hadron, Electron, 01 natural sciences, Computer Science Applications, Education, Nuclear physics, Flow (mathematics), Harmonics, 0103 physical sciences, Harmonic, Rapidity, Eccentricity (behavior), Nuclear Experiment, 010306 general physics, QCD matter, media_common
Abstract

Collective flow phenomena are a sensitive probe for the properties of extreme QCD matter. However, their interpretation relies on the understanding of the initial conditions e.g. the eccentricity of the nuclear overlap region. HADES [1] provides a large acceptance combined with a high mass-resolution and therefore allows to study di-electron and hadron production in heavy-ion collisions with unprecedented precision. In this contribution, the capability of HADES to study flow harmonics by utilizing multi-particle azimuthal correlation techniques is discussed. Due to the high statistics of seven billion Au+Au collisions at 1.23 AGeV collected in 2012, a systematic study of higher-order flow harmonics, the differentiation between collective and non-flow effects, and as well the multi-differential (p t, rapidity, centrality) analysis is possible.

Published
2016
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