Search

Your search keyword '"Elfner, Hannah"' showing total 197 results
Start Over Author "Elfner, Hannah"
197 results on '"Elfner, Hannah"'

51. Benchmarking a Non-Equilibrium Approach to Photon Emission in Relativistic Heavy-Ion Collisions

Author

Schäfer, Anna, Torres-Rincon, Juan M., Rothermel, Jonas, Ehlert, Niklas, Gale, Charles, and Elfner, Hannah

Subjects
Nuclear Theory, High Energy Physics - Phenomenology, Nuclear Experiment
Abstract

In this work, the production of photons through binary scattering processes is investigated for equilibrated hadronic systems. More precisely, a non-equilibrium hadronic transport approach to describe relativistic heavy-ion collisions is benchmarked with respect to photon emission. Cross sections for photon production in $\pi + \rho \to \pi + \gamma$ and $\pi + \pi \to \rho + \gamma$ scattering processes are derived from an effective chiral field theory and implemented into the hadronic transport approach, SMASH (Simulating Many Accelerated Strongly-interacting Hadrons). The implementation is verified by systematically comparing the thermal photon rate to theoretical expectations. Further, the impact of form factors is discussed, scattering processes mediated by $\omega$ mesons are found to contribute significantly to the total photon production. Several comparisons of the yielded photon rates are performed: to parametrizations of the very same rates, as used in hydrodynamic simulations, to previous works relying on different cross sections for the production of direct photons from the hadronic stage, and to partonic rates. Finally, the impact of considering the finite width of the $\rho$ meson is investigated, where a significant enhancement of photon production in the low-energy region is observed. This benchmark is the first step towards a consistent treatment of photon emission in hybrid hydrodynamics+transport approaches and a genuine dynamical description., Comment: 14 pages, 15 figures

Published
2019
Full Text
View/download PDF

52. Centrality dependence of deuteron production in Pb+Pb collisions at 2.76 TeV via hydrodynamics and hadronic afterburner

Author

Oliinychenko, Dmytro, Pang, Long-Gang, Elfner, Hannah, and Koch, Volker

Subjects
High Energy Physics - Phenomenology, Nuclear Theory
Abstract

The deuteron binding energy is only 2.2 MeV. At the same time, its yield in Pb+Pb collisions at $\sqrt{s_{NN}} = $2.76 TeV corresponds to a thermal yield at the temperature around 155 MeV, which is too hot to keep deuterons bound. This puzzle is not completely resolved yet. In general, the mechanism of light nuclei production in ultra-high energy heavy ion collisions remains under debate. In a previous work [1] we suggest a microscopic explanation of the deuteron production in central ultra-relativistic Pb+Pb collisions, the main mechanism being $\pi pn \leftrightarrow \pi d$ reactions in the hadronic phase of the collision. We use a state-of-the-art hybrid approach, combining relativistic hydrodynamics for the hot and dense stage and hadronic transport for a later, more dilute stage. Deuteron rescattering in the hadronic stage is implemented explicitly, using its experimentally measured vacuum cross-sections. In these proceedings we extend our previous work to non-central collisions, keeping exactly the same methodology and parameters. We find that our approach leads to a good description of the measured deuteron transverse momentum spectra at centralities up to 40%, and underestimates the amount of deuterons at low transverse momentum at higher centralities. Nevertheless, the coalescence parameter $B_2$, measured by ALICE collaboration, is reproduced well in our approach even for peripheral collisions., Comment: Proceedings of Hot Quarks 2018, 4 pages, 2 figures

Published
2018

53. Global angular momentum generation in heavy-ion reactions within a hadronic transport approach

Author

Sass Nils, Müller Marco, Garcia-Montero Oscar, and Elfner Hannah

Subjects
Physics, QC1-999
Abstract

In this study, we utilize the SMASH transport model to explore the generation of global angular momentum in heavy-ion collisions. Our results corroborate previous models, highlighting a pronounced peak in angular momentum transfer during mid-central collisions at b = 4 - 6 fm across √SNN = 2:41 - 200 GeV. Additionally, we thoroughly investigate the impact of system size and centrality on angular momentum. Intriguingly, we observe a distinct trend towards higher relative angular momentum transfer in smaller systems and more central collisions. To address local angular momentum conservation intricacies, we propose tailored setups for varying energy regimes, relying on the test particle method and Fermi motion treatment.

Published
2024
Full Text
View/download PDF

54. Electrical conductivity and relaxation via colored noise in a hadronic gas

Author

Hammelmann, Jan, Torres-Rincon, Juan M., Rose, Jean-Bernard, Greif, Moritz, and Elfner, Hannah

Subjects
High Energy Physics - Phenomenology, Nuclear Theory
Abstract

Motivated by the theory of relativistic hydrodynamic fluctuations we make use of the Green-Kubo formula to compute the electrical conductivity and the (second-order) relaxation time of the electric current of an interacting hadron gas. We use the recently developed transport code SMASH to numerically solve the coupled set of Boltzmann equations implementing realistic hadronic interactions. In particular, we explore the role of the resonance lifetimes in the determination of the electrical relaxation time. As opposed to a previous calculation of the shear viscosity we observe that the presence of resonances with lifetimes of the order of the mean-free time does not appreciably affect the relaxation of the electric current fluctuations. We compare our results to other approaches describing similar systems, and provide the value of the electrical conductivity and the relaxation time for a hadron gas at temperatures between T=60 MeV and T=150 MeV., Comment: 29 pages, 11 figures. Typos corrected, new references incorporated and minor clarifications added. Version to be published by the Physical Review D journal

Published
2018
Full Text
View/download PDF

55. Deuterons at LHC: 'snowballs in hell' via hydrodynamics and hadronic afterburner

Author

Oliinychenko, Dmytro, Pang, Long-Gang, Elfner, Hannah, and Koch, Volker

Subjects
High Energy Physics - Phenomenology
Abstract

The deuteron yield in Pb+Pb collisions at $\sqrt{s_{NN}} = 2.76$ TeV is consistent with thermal production at a freeze-out temperature of $T = 155$ MeV. The existence of deuterons with binding energy of 2.2 MeV at this temperature was described as "snowballs in hell". We provide a microscopic explanation of this phenomenon, utilizing relativistic hydrodynamics and switching to a hadronic afterburner at the above mentioned temperature of $T = 155$ MeV. The measured deuteron $p_T$-spectra and coalescence parameter $B_2(p_T)$ are reproduced without free parameters, only by implementing experimentally known cross-sections of deuteron reactions with hadrons, most importantly $\pi d \leftrightarrow \pi n p$., Comment: 13 pages, 10 figures, version accepted to publication

Published
2018
Full Text
View/download PDF

56. Comparison of heavy-ion transport simulations: Collision integral with pions and Δ resonances in a box

Author

Ono, Akira, Xu, Jun, Colonna, Maria, Danielewicz, Pawel, Ko, Che Ming, Tsang, Manyee Betty, Wang, Yong-Jia, Wolter, Hermann, Zhang, Ying-Xun, Chen, Lie-Wen, Cozma, Dan, Elfner, Hannah, Feng, Zhao-Qing, Ikeno, Natsumi, Li, Bao-An, Mallik, Swagata, Nara, Yasushi, Ogawa, Tatsuhiko, Ohnishi, Akira, Oliinychenko, Dmytro, Su, Jun, Song, Taesoo, Zhang, Feng-Shou, and Zhang, Zhen

Subjects
Nuclear and Plasma Physics, Synchrotrons and Accelerators, Physical Sciences, nucl-th, nucl-ex, Nuclear and plasma physics
Abstract

Background: Simulations by transport codes are indispensable for extracting valuable physical information from heavy-ion collisions. Pion observables such as the π-/π+ yield ratio are expected to be sensitive to the symmetry energy at high densities. Purpose: To evaluate, understand, and reduce the uncertainties in transport-code results originating from different approximations in handling the production of Δ resonances and pions. Methods: We compare ten transport codes under controlled conditions for a system confined in a box, with periodic boundary conditions, and initialized with nucleons at saturation density and at a temperature of 60 MeV. The reactions NN↔NΔ and Δ↔Nπ are implemented, but the Pauli blocking and the mean-field potential are deactivated in the present comparison. Thus, these are cascade calculations including pions and Δ resonances. Results are compared to those from the two reference cases of a chemically equilibrated ideal gas mixture and of the rate equation. Results: For the numbers of Δ and π, deviations from the reference values are observed in many codes, and they depend significantly on the size of the time step. These deviations are tied to different ways in ordering the sequence of reactions, such as collisions and decays, that take place in the same time step. Better agreements with the reference values are seen in the reaction rates and the number ratios among the isospin species of Δ and π. Both the reaction rates and the number ratios are, however, affected by the correlations between particle positions, which are absent in the Boltzmann equation, but are induced by the way particle scatterings are treated in many of the transport calculations. The uncertainty in the transport-code predictions of the π-/π+ ratio, after letting the existing Δ resonances decay, is found to be within a few percent for the system initialized at n/p=1.5. Conclusions: The uncertainty in the final π-/π+ ratio in this simplified case of particles in a box is sufficiently small so that it does not strongly impact constraining the high-density symmetry energy from heavy-ion collisions. Most of the sources of uncertainties have been understood, and individual codes may be further improved in future applications. This investigation will be extended in the future to heavy-ion collisions to ensure the problems identified here remain under control.

Published
2019

57. Microscopic study of deuteron production in PbPb collisions at s=2.76TeV via hydrodynamics and a hadronic afterburner

Author

Oliinychenko, Dmytro, Pang, Long-Gang, Elfner, Hannah, and Koch, Volker

Subjects
Nuclear and Plasma Physics, Particle and High Energy Physics, Physical Sciences, hep-ph, Nuclear and plasma physics
Abstract

The deuteron yield in Pb+Pb collisions at sNN=2.76TeV is consistent with thermal production at a freeze out temperature of T=155MeV. The existence of deuterons with binding energy of 2.2 MeV at this temperature was described as "snowballs in hell" [P. Braun-Münzinger, B. Dönigus, and N. Löher, CERN Courier, August 2015]. We provide a microscopic explanation of this phenomenon, utilizing relativistic hydrodynamics and switching to a hadronic afterburner at the above-mentioned temperature of T=155MeV. The measured deuteron pT spectra and coalescence parameter B2(pT) are reproduced without free parameters, only by implementing experimentally known cross sections of deuteron reactions with hadrons, most importantly πd↔πnp.

Published
2019

66. Long range plans to study the nuclear equation-of-state from sub- to supra-saturation densities with heavy-ion collisions

Author

Le Fèvre A., Colonna M., Verde G., Agarwal K., Aichelin J., Aumann T., Chbihi A., Cozma M.D., De Filippo E., Elfner Hannah, Galatyuk T., Hartnack Ch., Leifels Y., Pirrone S., Senger P., Stroth J., Russotto P., Schmidt H.R., Schwenk A., and Wolter H.

Subjects
Physics, QC1-999
Abstract

We cover here the present state-of-the-art in constraining the nuclear equation-of-state (EoS) and the symmetry energy using heavy-ion collisions (HIC), from sub- to supra-saturation densities, from Fermi to (ultra-) relativistic beam energies. We also discuss how HIC constraints on the EoS contribute to the knowledge of thermodynamical properties of neutron star matter. Necessary improvements and challenges are outlined, in particular in the perspective, for HICs, of staying competitive with future astrophysical multimessenger observations.

Published
2023
Full Text
View/download PDF

69. Dense nuclear matter equation of state from heavy-ion collisions

Author

Sorensen, Agnieszka, primary, Agarwal, Kshitij, additional, Brown, Kyle W., additional, Chajecki, Zbigniew, additional, Danielewicz, Paweł, additional, Drischler, Christian, additional, Gandolfi, Stefano, additional, Holt, Jeremy W., additional, Kaminski, Matthias, additional, Ko, Che-Ming, additional, Kumar, Rohit, additional, Li, Bao-An, additional, Lynch, William G., additional, McIntosh, Alan B., additional, Newton, William G., additional, Pratt, Scott, additional, Savchuk, Oleh, additional, Stefaniak, Maria, additional, Tews, Ingo, additional, Tsang, ManYee Betty, additional, Vogt, Ramona, additional, Wolter, Hermann, additional, Zbroszczyk, Hanna, additional, Abbasi, Navid, additional, Aichelin, Jörg, additional, Andronic, Anton, additional, Bass, Steffen A., additional, Becattini, Francesco, additional, Blaschke, David, additional, Bleicher, Marcus, additional, Blume, Christoph, additional, Bratkovskaya, Elena, additional, Brown, B. Alex, additional, Brown, David A., additional, Camaiani, Alberto, additional, Casini, Giovanni, additional, Chatziioannou, Katerina, additional, Chbihi, Abdelouahad, additional, Colonna, Maria, additional, Cozma, Mircea Dan, additional, Dexheimer, Veronica, additional, Dong, Xin, additional, Dore, Travis, additional, Du, Lipei, additional, Dueñas, José A., additional, Elfner, Hannah, additional, Florkowski, Wojciech, additional, Fujimoto, Yuki, additional, Furnstahl, Richard J., additional, Gade, Alexandra, additional, Galatyuk, Tetyana, additional, Gale, Charles, additional, Geurts, Frank, additional, Grozdanov, Sašo, additional, Hagel, Kris, additional, Harris, Steven P., additional, Haxton, Wick, additional, Heinz, Ulrich, additional, Heller, Michal P., additional, Hen, Or, additional, Hergert, Heiko, additional, Herrmann, Norbert, additional, Huang, Huan Zhong, additional, Huang, Xu-Guang, additional, Ikeno, Natsumi, additional, Inghirami, Gabriele, additional, Jankowski, Jakub, additional, Jia, Jiangyong, additional, Jiménez, José C., additional, Kapusta, Joseph, additional, Kardan, Behruz, additional, Karpenko, Iurii, additional, Keane, Declan, additional, Kharzeev, Dmitri, additional, Kugler, Andrej, additional, Le Fèvre, Arnaud, additional, Lee, Dean, additional, Liu, Hong, additional, Lisa, Michael A., additional, Llope, William J., additional, Lombardo, Ivano, additional, Lorenz, Manuel, additional, Marchi, Tommaso, additional, McLerran, Larry, additional, Mosel, Ulrich, additional, Motornenko, Anton, additional, Müller, Berndt, additional, Napolitani, Paolo, additional, Natowitz, Joseph B., additional, Nazarewicz, Witold, additional, Noronha, Jorge, additional, Noronha-Hostler, Jacquelyn, additional, Odyniec, Grażyna, additional, Papakonstantinou, Panagiota, additional, Paulínyová, Zuzana, additional, Piekarewicz, Jorge, additional, Pisarski, Robert D., additional, Plumberg, Christopher, additional, Prakash, Madappa, additional, Randrup, Jørgen, additional, Ratti, Claudia, additional, Rau, Peter, additional, Reddy, Sanjay, additional, Schmidt, Hans-Rudolf, additional, Russotto, Paolo, additional, Ryblewski, Radoslaw, additional, Schäfer, Andreas, additional, Schenke, Björn, additional, Sen, Srimoyee, additional, Senger, Peter, additional, Seto, Richard, additional, Shen, Chun, additional, Sherrill, Bradley, additional, Singh, Mayank, additional, Skokov, Vladimir, additional, Spaliński, Michał, additional, Steinheimer, Jan, additional, Stephanov, Mikhail, additional, Stroth, Joachim, additional, Sturm, Christian, additional, Sun, Kai-Jia, additional, Tang, Aihong, additional, Torrieri, Giorgio, additional, Trautmann, Wolfgang, additional, Verde, Giuseppe, additional, Vovchenko, Volodymyr, additional, Wada, Ryoichi, additional, Wang, Fuqiang, additional, Wang, Gang, additional, Werner, Klaus, additional, Xu, Nu, additional, Xu, Zhangbu, additional, Yee, Ho-Ung, additional, Yennello, Sherry, additional, and Yin, Yi, additional

Published
2023
Full Text
View/download PDF

73. Thermodynamics of an updated hadronic resonance list and influence on hadronic transport

Author

Salinas San Martín, Jordi, Hirayama, Renan, Hammelmann, Jan, Karthein, Jamie M., Parotto, Paolo, Noronha-Hostler, Jacquelyn, Ratti, Claudia, Elfner, Hannah, Salinas San Martín, Jordi, Hirayama, Renan, Hammelmann, Jan, Karthein, Jamie M., Parotto, Paolo, Noronha-Hostler, Jacquelyn, Ratti, Claudia, and Elfner, Hannah

Abstract

Hadron lists based on experimental studies summarized by the Particle Data Group (PDG) are a crucial input for the equation of state and thermal models used in the study of strongly-interacting matter produced in heavy-ion collisions. Modeling of these strongly-interacting systems is carried out via hydrodynamical simulations, which are followed by hadronic transport codes that also require a hadronic list as input. To remain consistent throughout the different stages of modeling of a heavy-ion collision, the same hadron list with its corresponding decays must be used at each step. It has been shown that even the most uncertain states listed in the PDG from 2016 are required to reproduce partial pressures and susceptibilities from Lattice Quantum Chromodynamics with the hadronic list known as the PDG2016+. Here, we update the hadronic list for use in heavy-ion collision modeling by including the latest experimental information for all states listed in the Particle Data Booklet in 2021. We then compare our new list, called PDG2021+, to Lattice Quantum Chromodynamics results and find that it achieves even better agreement with the first principles calculations than the PDG2016+ list. Furthermore, we develop a novel scheme based on intermediate decay channels that allows for only binary decays, such that PDG2021+ will be compatible with the hadronic transport framework SMASH. Finally, we use these results to make comparisons to experimental data and discuss the impact on particle yields and spectra.

Published
2023

76. Conservation laws in a novel hybrid approach

Author

Schäfer, Anna, Karpenko, Iurii, and Elfner, Hannah

Subjects
Nuclear Theory (nucl-th), High Energy Physics - Phenomenology, High Energy Physics - Phenomenology (hep-ph), Nuclear Theory, FOS: Physical sciences, Nuclear Experiment
Abstract

Heavy-ion collisions covering a wide range of collision energies provide a vast amount of observables characterizing the properties of strongly-interacting matter. In particular collisions towards the high baryon-density regime of the QCD phase-diagram have become of interest to study the postulated first order phase transition and to locate a possible critical end point. In this work, the SMASH-vHLLE-hybrid is presented as a novel hybrid model to theoretically describe such heavy-ion collisions. In addition, the SMASH hadron resonance gas equation of state is introduced. The accuracy of the latter is shown to be of fundamental importance in order to conserve energy, baryon number and electric charge throughout the different stages of the hybrid model. Furthermore, the impact of an inaccurate equation of state on final state observables is discussed. This work constitutes a first validation of the SMASH-vHLLE-hybrid in terms of conservation laws and excitation functions. It is expected to be applied to a broader range of observables in the future., Comment: Proceedings CPOD 2021

Published
2022

78. Transport model comparison studies of intermediate-energy heavy-ion collisions

Author

Wolter, Hermann, primary, Colonna, Maria, additional, Cozma, Dan, additional, Danielewicz, Pawel, additional, Ko, Che Ming, additional, Kumar, Rohit, additional, Ono, Akira, additional, Tsang, ManYee Betty, additional, Xu, Jun, additional, Zhang, Ying-Xun, additional, Bratkovskaya, Elena, additional, Feng, Zhao-Qing, additional, Gaitanos, Theodoros, additional, Le Fèvre, Arnaud, additional, Ikeno, Natsumi, additional, Kim, Youngman, additional, Mallik, Swagata, additional, Napolitani, Paolo, additional, Oliinychenko, Dmytro, additional, Ogawa, Tatsuhiko, additional, Papa, Massimo, additional, Su, Jun, additional, Wang, Rui, additional, Wang, Yong-Jia, additional, Weil, Janus, additional, Zhang, Feng-Shou, additional, Zhang, Guo-Qiang, additional, Zhang, Zhen, additional, Aichelin, Joerg, additional, Cassing, Wolfgang, additional, Chen, Lie-Wen, additional, Cheng, Hui-Gan, additional, Elfner, Hannah, additional, Gallmeister, K., additional, Hartnack, Christoph, additional, Hashimoto, Shintaro, additional, Jeon, Sangyong, additional, Kim, Kyungil, additional, Kim, Myungkuk, additional, Li, Bao-An, additional, Lee, Chang-Hwan, additional, Li, Qing-Feng, additional, Li, Zhu-Xia, additional, Mosel, Ulrich, additional, Nara, Yasushi, additional, Niita, Koji, additional, Ohnishi, Akira, additional, Sato, Tatsuhiko, additional, Song, Taesoo, additional, Sorensen, Agnieszka, additional, Wang, Ning, additional, and Xie, Wen-Jie, additional

Published
2022
Full Text
View/download PDF

80. Der intuitive Zugang zum Urknall

Author

Elfner, Hannah and Barth, Pia

Subjects
ddc:370, ddc:530
Abstract

Die theoretische Physikerin Hannah Elfner erhält für ihre Forschung zu Ereignissen kurz nach dem Urknall den Preis »Scientist of the Year« 2021. Ein Gespräch über das Warten auf Daten, über die Rolle von Visualisierungen vom »Little Bang« und die Betreuung von Studierenden.

Published
2022

81. The applicability of hydrodynamics in heavy ion collisions at √sNN = 2.4–7.7 GeV

Author

Inghirami, Gabriele, Elfner, Hannah, Inghirami, Gabriele, and Elfner, Hannah

Abstract

To assess the degree of equilibration of the matter created in heavy-ion reactions at low to intermediate beam energies, a hadronic transport approach (SMASH) is employed. By using a coarse-graining method, we compute the energy momentum tensor of the system at fixed time steps and evaluate the degree of isotropy of the diagonal terms and the relative magnitude of the off-diagonal terms. This study focuses mostly on Au+Au collisions in the energy range s√NN = 2.4–7.7 GeV, but central collisions of lighter ions like C+C, Ar+KCl and Ag+Ag are considered as well. We find that the conditions concerning local equilibration for a hydrodynamic description are reasonably satisfied in a large portion of the system for a significant amount of time (several fm/c) when considering the average evolution of many events, yet they are rarely fulfilled on an event by event basis. This is relevant for the application of hybrid approaches at low beam energies as they are or will be reached by the HADES experiment at GSI, the future CBM experiment at FAIR as well as the beam energy scan program at RHIC.

Published
2022

82. Influence of heavy resonances in SMASH

Author

Salinas San Martín, Jordi, Noronha-Hostler, Jacquelyn, Elfner, Hannah, Hammelmann, Jan, Hirayama, Renan, Salinas San Martín, Jordi, Noronha-Hostler, Jacquelyn, Elfner, Hannah, Hammelmann, Jan, and Hirayama, Renan

Abstract

Recent lattice QCD results, comparing to a hadron resonance gas model, have shown the need for hundreds of particles in hadronic models. These extra particles influence both the equation of state and hadronic interactions within hadron transport models. Here, we introduce the PDG21+ particle list, which contains the most up-to-date database of particles and their properties. We then convert all particles decays into 2 body decays so that they are compatible with SMASH in order to produce a more consistent description of a heavy-ion collision.

Published
2022

84. GPU accelerated optical light propagation in CORSIKA 8

Author

Baack, Dominik, Reininghaus, Maximilian, Alameddine, Jean-Marco, Albrecht, Johannes, Alvarez-Muniz, Jaime, Jr., Antonio Augusto Alves, Arrabito, Luisa, Bernlöhr, Konrad, Bleicher, Marcus, BREGEON, Johan, Carrere, Matthieu, Dembinski, Hans, Elfner, Hannah, Elsässer, Dominik, Engel, Ralph, Hu, Fan, Fedynitch, Anatoli, Heck, Dieter, Huege, Tim, Kampert, Karl-Heinz, Karastathis, Nikolaos, Nellen, Lukas, Nöthe, Maximilian, Parello, David, Pierog, Tanguy, Pokrandt, Maria, Poctarev, Anton, Prechelt, Remy, Rhode, Wolfgang, Riehn, Felix, Sackel, Maximilian, Sandrock, Alexander, Sampathkumar, Pranav, Schmelling, Michael, Schmidt, André, Sigl, Günter, Soedingrekso, Jan, Spaan, Bernhard, Xu, Donglian, Ammerman-Yebra, Juan, Zas, Enrique, and CORSIKA 8 Collaboration

Subjects
Physics, ddc:530
Abstract

Optical photons, created from fluorescence or Cherenkov emission in atmospheric cascades induced through high energetic cosmic rays are of major interest for several experiments. Experiments like CTA require a significant amount of computing time and funds for the simulation with CORSIKA 7. Since individual photons don’t interact they can be simulated without any order. The traditional sequential approach is simple but leads to reduced utilization of modern hardware infrastructure. The calculations done on each photon have low complexity, compared to the other aspects of the simulation. This, as well as the fact that, besides information about the photon itself, nearly no additional data is needed, favors a data-parallel approach in which several photons are propagated concurrently. The new CORSIKA 8 framework enables the implementation and verification of these methods. With the use of dedicated high parallel acceleration hardware like GPUs the possible benefits with this data-parallel approach are even higher.

Published
2022
Full Text
View/download PDF

85. The BEST framework for the search for the QCD critical point and the chiral magnetic effect

Author

An, Xin, primary, Bluhm, Marcus, additional, Du, Lipei, additional, Dunne, Gerald V., additional, Elfner, Hannah, additional, Gale, Charles, additional, Grefa, Joaquin, additional, Heinz, Ulrich, additional, Huang, Anping, additional, Karthein, Jamie M., additional, Kharzeev, Dmitri E., additional, Koch, Volker, additional, Liao, Jinfeng, additional, Li, Shiyong, additional, Martinez, Mauricio, additional, McNelis, Michael, additional, Mroczek, Debora, additional, Mukherjee, Swagato, additional, Nahrgang, Marlene, additional, Nava Acuna, Angel R., additional, Noronha-Hostler, Jacquelyn, additional, Oliinychenko, Dmytro, additional, Parotto, Paolo, additional, Portillo, Israel, additional, Pradeep, Maneesha Sushama, additional, Pratt, Scott, additional, Rajagopal, Krishna, additional, Ratti, Claudia, additional, Ridgway, Gregory, additional, Schäfer, Thomas, additional, Schenke, Björn, additional, Shen, Chun, additional, Shi, Shuzhe, additional, Singh, Mayank, additional, Skokov, Vladimir, additional, Son, Dam T., additional, Sorensen, Agnieszka, additional, Stephanov, Mikhail, additional, Venugopalan, Raju, additional, Vovchenko, Volodymyr, additional, Weller, Ryan, additional, Yee, Ho-Ung, additional, and Yin, Yi, additional

Published
2022
Full Text
View/download PDF

87. Comparison of heavy-ion transport simulations: Mean-field dynamics in a box

Author

Colonna, Maria, primary, Zhang, Ying-Xun, additional, Wang, Yong-Jia, additional, Cozma, Dan, additional, Danielewicz, Pawel, additional, Ko, Che Ming, additional, Ono, Akira, additional, Tsang, Manyee Betty, additional, Wang, Rui, additional, Wolter, Hermann, additional, Xu, Jun, additional, Zhang, Zhen, additional, Chen, Lie-Wen, additional, Cheng, Hui-Gan, additional, Elfner, Hannah, additional, Feng, Zhao-Qing, additional, Kim, Myungkuk, additional, Kim, Youngman, additional, Jeon, Sangyong, additional, Lee, Chang-Hwan, additional, Li, Bao-An, additional, Li, Qing-Feng, additional, Li, Zhu-Xia, additional, Mallik, Swagata, additional, Oliinychenko, Dmytro, additional, Su, Jun, additional, Song, Taesoo, additional, Sorensen, Agnieszka, additional, and Zhang, Feng-Shou, additional

Published
2021
Full Text
View/download PDF

88. Symmetry energy investigation with pion production from Sn+Sn systems

Author

Jhang, G., Estee, J., Barney, J., Cerizza, G., Kaneko, M., Lee, J.W., Lynch, W.G., Isobe, T., Kurata-Nishimura, M., Murakami, T., Tsang, C.Y., Tsang, M.B., Wang, R., Ahn, D.S., Atar, L., Aumann, T., Baba, H., Boretzky, K., Brzychczyk, J., Chiga, N., Fukuda, N., Gasparic, I., Hong, B., Horvat, A., Ieki, K., Inabe, N., Kim, Y.J., Kobayashi, T., Kondo, Y., Lasko, P., Lee, H.S., Leifels, Y., Łukasik, J., Manfredi, J., McIntosh, A.B., Morfouace, P., Nakamura, T., Nakatsuka, N., Nishimura, S., Olsen, R., Otsu, H., Pawłowski, P., Pelczar, K., Rossi, D., Sakurai, H., Santamaria, C., Sato, H., Scheit, H., Shane, R., Shimizu, Y., Simon, H., Snoch, A., Sochocka, A., Sosin, Z., Sumikama, T., Suzuki, H., Suzuki, D., Takeda, H., Tangwancharoen, S., Toernqvist, H., Togano, Y., Xiao, Z.G., Yennello, S.J., Yurkon, J., Zhang, Y., Colonna, Maria, Cozma, Dan, Danielewicz, Paweł, Elfner, Hannah, Ikeno, Natsumi, Ko, Che Ming, Mohs, Justin, Oliinychenko, Dmytro, Ono, Akira, Su, Jun, Wang, Yong Jia, Wolter, Hermann, Xu, Jun, Zhang, Ying-Xun, and Zhang, Zhen

Published
2021
Full Text
View/download PDF

89. Particle production in AgAg collisions at <math><mrow><msub><mi>E</mi><mi>Kin</mi></msub><mo>=</mo><mn>1.58</mn><mi>A</mi></mrow></math> GeV within a hadronic transport approach

Author

Staudenmaier, Jan, Kübler, Natey, and Elfner, Hannah

Abstract

Heavy-ion collisions at low beam energies explore the high density regime of strongly interacting matter. The dynamical evolution of these collisions can be successfully described by hadronic transport approaches. In March 2019, the HADES Collaboration took data for AgAg collisions at EKin=1.58AGeV, and in this work we provide predictions for particle production and spectra within the Simulating Many Accelerated Strongly interacting Hadrons (smash) approach. The multiplicities and spectra of strange and nonstrange particles follow the expected trends as a function of system size. In particular, in ArKCl (and pNb) collisions, much higher yields of double-strange baryons were observed experimentally than expected from a thermal model. Therefore, we incorporate a previously suggested mechanism to produce Ξ baryons via rare decays of high mass N* resonances and predict the multiplicities. In addition, we predict the invariant mass spectrum for dilepton emission and explore the most important sources of dileptons above 1 GeV, that are expected to indicate the temperature of the medium. Interestingly, the overall dilepton emission is very similar to the one in AuAu collisions at 1.23AGeV, a hint that the smaller system at a higher energy behaves very similarly to the larger system at lower beam energy.

Published
2021

90. The applicability of hydrodynamics in heavy ion collisions at sNN = 2.4–7.7 GeV.

Author

Inghirami, Gabriele and Elfner, Hannah

Subjects
HYDRODYNAMICS
Abstract

To assess the degree of equilibration of the matter created in heavy-ion reactions at low to intermediate beam energies, a hadronic transport approach (SMASH) is employed. By using a coarse-graining method, we compute the energy momentum tensor of the system at fixed time steps and evaluate the degree of isotropy of the diagonal terms and the relative magnitude of the off-diagonal terms. This study focuses mostly on Au+Au collisions in the energy range s NN = 2.4–7.7 GeV, but central collisions of lighter ions like C+C, Ar+KCl and Ag+Ag are considered as well. We find that the conditions concerning local equilibration for a hydrodynamic description are reasonably satisfied in a large portion of the system for a significant amount of time (several fm/c) when considering the average evolution of many events, yet they are rarely fulfilled on an event by event basis. This is relevant for the application of hybrid approaches at low beam energies as they are or will be reached by the HADES experiment at GSI, the future CBM experiment at FAIR as well as the beam energy scan program at RHIC. [ABSTRACT FROM AUTHOR]

Published
2022
Full Text
View/download PDF

91. Hadron cascades in CORSIKA 8

Author

Ulrich, Ralf, primary, Jr., Antonio Augusto Alves, additional, Reininghaus, Maximilian, additional, Alameddine, Jean-Marco, additional, Albrecht, Johannes, additional, Alvarez-Muniz, Jaime, additional, Arrabito, Luisa, additional, Baack, Dominik, additional, Bernlöhr, Konrad, additional, Bleicher, Marcus, additional, BREGEON, Johan, additional, Carrere, Matthieu, additional, Dembinski, Hans, additional, Elfner, Hannah, additional, Elsässer, Dominik, additional, Engel, Ralph, additional, Hu, Fan, additional, Fedynitch, Anatoli, additional, Heck, Dieter, additional, Huege, Tim, additional, Kampert, Karl-Heinz, additional, Karastathis, Nikolaos, additional, Nellen, Lukas, additional, Nöthe, Maximilian, additional, Parello, David, additional, Pierog, Tanguy, additional, Pokrandt, Maria, additional, Poctarev, Anton, additional, Prechelt, Remy, additional, Rhode, Wolfgang, additional, Riehn, Felix, additional, Sackel, Maximilian, additional, Sandrock, Alexander, additional, Sampathkumar, Pranav, additional, Schmelling, Michael, additional, Schmidt, André, additional, Sigl, Günter, additional, Soedingrekso, Jan, additional, Spaan, Bernhard, additional, Xu, Donglian, additional, Ammerman-Yebra, Juan, additional, and Zas, Enrique, additional

Published
2021
Full Text
View/download PDF

92. Electromagnetic Shower Simulation for CORSIKA 8

Author

Alameddine, Jean-Marco, primary, Alvarez-Muniz, Jaime, additional, Ammerman-Yebra, Juan, additional, Bollmann, Lars, additional, Rhode, Wolfgang, additional, Sackel, Maximilian, additional, Sandrock, Alexander, additional, Soedingrekso, Jan, additional, Zas, Enrique, additional, Albrecht, Johannes, additional, Jr., Antonio Augusto Alves, additional, Arrabito, Luisa, additional, Baack, Dominik, additional, Bernlöhr, Konrad, additional, Bleicher, Marcus, additional, BREGEON, Johan, additional, Carrere, Matthieu, additional, Dembinski, Hans, additional, Elfner, Hannah, additional, Elsässer, Dominik, additional, Engel, Ralph, additional, Hu, Fan, additional, Fedynitch, Anatoli, additional, Heck, Dieter, additional, Huege, Tim, additional, Kampert, Karl-Heinz, additional, Karastathis, Nikolaos, additional, Nellen, Lukas, additional, Nöthe, Maximilian, additional, Parello, David, additional, Pierog, Tanguy, additional, Pokrandt, Maria, additional, Poctarev, Anton, additional, Prechelt, Remy, additional, Reininghaus, Maximilian, additional, Riehn, Felix, additional, Sampathkumar, Pranav, additional, Schmelling, Michael, additional, Schmidt, André, additional, Sigl, Günter, additional, Spaan, Bernhard, additional, Ulrich, Ralf, additional, and Xu, Donglian, additional

Published
2021
Full Text
View/download PDF

93. GPU Accelerated optical light propagation in CORSIKA8

Author

Baack, Dominik, primary, Reininghaus, Max, additional, Alameddine, Jean-Marco, additional, Albrecht, Johannes, additional, Alvarez-Muniz, Jaime, additional, Jr., Antonio Augusto Alves, additional, Arrabito, Luisa, additional, Bernlöhr, Konrad, additional, Bleicher, Marcus, additional, BREGEON, Johan, additional, Carrere, Mathieu, additional, Dembinski, Hans, additional, Elfner, Hannah, additional, Elsässer, Dominik, additional, Engel, Ralph, additional, Fan, Hu, additional, Fedynitch, Anatoli, additional, Heck, Dieter, additional, Huege, Tim, additional, Kampert, Karl-Heinz, additional, Karastathis, Nikolaos, additional, Nellen, Lukas, additional, Nöthe, Maximilian, additional, Parello, David, additional, Pierog, Tanguy, additional, Pokrandt, Maria, additional, Poctarev, Anton, additional, Prechelt, Remy, additional, Reininghaus, Maximilian, additional, Rhode, Wolfgang, additional, Riehn, Felix, additional, Sackel, Maximilian, additional, Sandrock, Alexander, additional, Sampathkumar, Pranav, additional, Schmelling, Michael, additional, Schmidt, André, additional, Sigl, Günter, additional, Soedingrekso, Jan, additional, Spaan, Bernhard, additional, Xu, Donglian, additional, Ammerman-Yebra, Juan, additional, and Zas, Enrique, additional

Published
2021
Full Text
View/download PDF

94. Status of the novel CORSIKA 8 air shower simulation framework

Author

Alves Junior, Antonio Augusto, primary, Alameddine, Jean-Marco, additional, Arrabito, Luisa, additional, Baack, Dominik, additional, Bernlöhr, Konrad, additional, Bleicher, Marcus, additional, Carrere, Mathieu, additional, Dembinski, Hans, additional, Elfner, Hannah, additional, Elsässer, Dominik, additional, Engel, Ralph, additional, Fan, Hu, additional, Fedynitch, Anatoli, additional, Heck, Dieter, additional, Huege, Tim, additional, Kampert, Karl Heinz, additional, Karastathis, Nikolaos, additional, Nellen, Lukas, additional, Nöthe, Maximilian, additional, Parello, David, additional, Pierog, Tanguy, additional, Pokrandt, Maria, additional, Poctarev, Anton, additional, Prechelt, Remy, additional, Reininghaus, Maximilian, additional, Rhode, Wolfgang, additional, Riehn, Felix, additional, Sackel, Maximilian, additional, Sandrock, Alexander, additional, Sampathkumar, Pranav, additional, Schmelling, Michael, additional, Schmidt, André, additional, Sigl, Günter, additional, Soedingrekso, Jan, additional, Spaan, Bernhard, additional, Xu, Donglian, additional, Ammerman-Yebra, Juan, additional, Zas, Enrique, additional, and BREGEON, Johan, additional

Published
2021
Full Text
View/download PDF

95. Particle production in AgAg collisions at E Kin = 1.58 A GeV within a hadronic transport approach

Author

Staudenmaier, Jan, Kübler, Natey, and Elfner, Hannah

Subjects
Nuclear Theory, ddc:530, Nuclear Experiment
Abstract

Physical review / C 103(4), 044904 (2021). doi:10.1103/PhysRevC.103.044904, Heavy-ion collisions at low beam energies explore the high density regime of strongly interacting matter. The dynamical evolution of these collisions can be successfully described by hadronic transport approaches. In March 2019, the HADES Collaboration took data for AgAg collisions at EKin=1.58AGeV, and in this work we provide predictions for particle production and spectra within the Simulating Many Accelerated Strongly interacting Hadrons (smash) approach. The multiplicities and spectra of strange and nonstrange particles follow the expected trends as a function of system size. In particular, in ArKCl (and pNb) collisions, much higher yields of double-strange baryons were observed experimentally than expected from a thermal model. Therefore, we incorporate a previously suggested mechanism to produce Ξ baryons via rare decays of high mass N* resonances and predict the multiplicities. In addition, we predict the invariant mass spectrum for dilepton emission and explore the most important sources of dileptons above 1 GeV, that are expected to indicate the temperature of the medium. Interestingly, the overall dilepton emission is very similar to the one in AuAu collisions at 1.23AGeV, a hint that the smaller system at a higher energy behaves very similarly to the larger system at lower beam energy., Published by Inst., Woodbury, NY

Published
2021
Full Text
View/download PDF

96. Phenomenological Constraints on the Transport Properties of QCD Matter with Data-Driven Model Averaging

Author

Everett, Derek, Ke, Weiyao, Paquet, Jean-François, Vujanovic, Gojko, Bass, Steffen A., Du, Lipei, Gale, Charles, Heffernan, Matthew, Heinz, Ulrich, Liyanage, Dananjaya, Luzum, Matthew, Majumder, Abhijit, McNelis, Michael, Shen, Chun, Xu, Yichun, Angerami, Aaron, Cao, Shanshan, Chen, Y., Coleman, Jonathon, Cunqueiro, Leticia, Dai, Tianyu, Ehlers, Raymond, Elfner, Hannah, Fan, Wang, Fries, Rainer J., Garza, Fabian, He, Yayun, Jacak, Barbara V., Jacobs, Peter Martin, Jeon, Sangyong, Kim, B., Kordell, Michael, Kumar, Amit, Mak, Simon, Mulligan, James D., Nattrass, Christine, Oliinychenko, Dmytro, Park, Chanwook, Putschke, Jörn H., Roland, Gunther, Schenke, Björn Peter, Schwiebert, Loren, Silva, A., Sirimanna, Chathuranga, Soltz, Ron Ariel, Tachibana, Yasuki, Wang, Xin-Nian, Wolpert, Robert L., Everett, Derek, Ke, Weiyao, Paquet, Jean-François, Vujanovic, Gojko, Bass, Steffen A., Du, Lipei, Gale, Charles, Heffernan, Matthew, Heinz, Ulrich, Liyanage, Dananjaya, Luzum, Matthew, Majumder, Abhijit, McNelis, Michael, Shen, Chun, Xu, Yichun, Angerami, Aaron, Cao, Shanshan, Chen, Y., Coleman, Jonathon, Cunqueiro, Leticia, Dai, Tianyu, Ehlers, Raymond, Elfner, Hannah, Fan, Wang, Fries, Rainer J., Garza, Fabian, He, Yayun, Jacak, Barbara V., Jacobs, Peter Martin, Jeon, Sangyong, Kim, B., Kordell, Michael, Kumar, Amit, Mak, Simon, Mulligan, James D., Nattrass, Christine, Oliinychenko, Dmytro, Park, Chanwook, Putschke, Jörn H., Roland, Gunther, Schenke, Björn Peter, Schwiebert, Loren, Silva, A., Sirimanna, Chathuranga, Soltz, Ron Ariel, Tachibana, Yasuki, Wang, Xin-Nian, and Wolpert, Robert L.

Abstract

Using combined data from the Relativistic Heavy Ion and Large Hadron Colliders, we constrain the shear and bulk viscosities of quark-gluon plasma (QGP) at temperatures of ∼150–350 MeV. We use Bayesian inference to translate experimental and theoretical uncertainties into probabilistic constraints for the viscosities. With Bayesian model averaging we propagate an estimate of the model uncertainty generated by the transition from hydrodynamics to hadron transport in the plasma’s final evolution stage, providing the most reliable phenomenological constraints to date on the QGP viscosities.

Published
2021

98. Particle production via strings and baryon stopping within a hadronic transport approach

Author

Mohs, J., Ryu, S., and Elfner, Hannah

Abstract

Journal of physics / G G, Nuclear and particle physics 47(6), 065101 (2020). doi:10.1088/1361-6471/ab7bd1, The stopping of baryons in heavy ion collisions at beam momenta of p lab = 20–160A GeV is lacking a quantitative description within theoretical calculations. Heavy ion reactions at these energies are experimentally explored at the Super Proton Synchrotron (SPS) and the Relativistic Heavy Ion Collider (RHIC) and will be studied at future facilities such as FAIR and NICA. Since the net baryon density is determined by the amount of stopping, this is the pre-requisite for any investigation of other observables related to structures in the QCD phase diagram such as a first-order phase transition or a critical endpoint. In this work we employ a string model for treating hadron–hadron interactions within a hadronic transport approach (SMASH, Simulating Many Accelerated Strongly-interacting Hadrons). Free parameters of the string excitation and decay are tuned to match experimental measurements in elementary proton–proton collisions, where some mismatch in the x F distribution of protons is still present. Afterwards, the model is applied to heavy ion collisions, where the experimentally observed change of the shape of the proton rapidity spectrum from a single peak structure to a double peak structure with increasing beam energy is reproduced. Heavy ion collisions provide the opportunity to study the formation process of string fragments in terms of formation times and reduced interaction cross-sections for pre-formed hadrons. A good agreement with the measured rapidity spectra of protons and pions is achieved while insights on the fragmentation process are obtained. In the future, the presented approach can be used to create event-by-event initial conditions for hybrid calculations., Published by IOP Publ., Bristol

Published
2020
Full Text
View/download PDF

99. Inclusive and effective bulk viscosities in the hadron gas

Author

Rose, Jean-Bernard, Torres-Rincon, Juan M., Elfner, Hannah, Rose, Jean-Bernard, Torres-Rincon, Juan M., and Elfner, Hannah

Abstract

We estimate the temperature dependence of the bulk viscosity in a relativistic hadron gas. Employing the Green–Kubo formalism in the SMASH (Simulating Many Accelerated Strongly-interacting Hadrons) transport approach, we study different hadronic systems in increasing order of complexity. We analyze the (in)validity of the single exponential relaxation ansatz for the bulk-channel correlation function and the strong influence of the resonances and their lifetimes. We discuss the difference between the inclusive bulk viscosity of an equilibrated, long-lived system, and the effective bulk viscosity of a short-lived mixture like the hadronic phase of relativistic heavy-ion collisions, where the processes whose inverse relaxation rate are larger than the fireball duration are excluded from the analysis. This clarifies the differences between previous approaches which computed the bulk viscosity including/excluding the very slow processes in the hadron gas. We compare our final results with previous hadron gas calculations and confirm a decreasing trend of the inclusive bulk viscosity over entropy density as temperature increases, whereas the effective bulk viscosity to entropy ratio, while being lower than the inclusive one, shows no strong dependence to temperature.

Published
2020

Catalog

Books, media, physical & digital resources
See catalog results