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First, second, third and fourth flow harmonics of deuterons and protons in Au+Au reactions at 1.23 A GeV

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arXiv 2019年

作者： Hillmann, Paula Christine Steinheimer, Jan reichert, Tom Gaebel, Vincent Bleicher, Marcus Sombun, Sukanya Herold, Christoph Limphirat, Ayut Institut für Theoretische Physik Goethe Universität Frankfurt Max-von-Laue-Str. 1 Frankfurt am MainD-60438 Germany Frankfurt Institute for Advanced Studies Ruth-Moufang-Str. 1 Frankfurt am Main60438 Germany GSI Helmholtzzentrum für Schwerionenforschung GmbH Planckstr. 1 Darmstadt64291 Germany John von Neumann-Institut für Computing Forschungszentrum Jülich Jülich52425 Germany School of Physics Center of Excellence in High Energy Physics & Astrophysics Suranaree University of Technology Nakhon Ratchasima30000 Thailand

We explore the directed, elliptic, triangular and quadrangular flow of deuterons in Au+Au reactions at a beam energy of 1.23 AGeV within the UrQMd approach. These investigations are of direct relevance for the HAdES experiment at GSI that has recently presented first data on the flow of light clusters in Au+Au collisions at 1.23 AGeV. To address the deuteron flow, UrQMd has been extended to include deuteron formation by coalescence. We find that this ansatz provides a very good description of the measured deuteron flow data, if a hard equation of state is used for the simulation. In addition we show that light cluster formation has a sizable impact on the proton flow and has to be taken into account to obtain reliable results in the forward/backward region. Based on the observed scaling of the flow, which is a natural result of coalescence, we conclude that deuteron production at GSI energies is a final state recombination effect. Finally, we also discuss the scaling relations of the higher order flow components up to v4. We show that v3 ∼ v1v2 and v4 ∼ v22 as function of transverse momentum and that the integrated v22 ∼ v4 over the investigated energy range from Elab=0.1 AGeV to 40 AGeV. Copyright © 2019, The Authors. All rights reserved.

关键词： deuterium

deuteron production from phase-space coalescence in the UrQMd approach

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arXiv 2018年

作者： Sombun, Sukanya Tomuang, Kristiya Limphirat, Ayut Hillmann, Paula Herold, Christoph Steinheimer, Jan Yan, Yupeng Bleicher, Marcus School of Physics Center of Excellence in High Energy Physics & Astrophysics Suranaree University of Technology Nakhon Ratchasima30000 Thailand Department of Physics Naresuan University Phitsanulok65000 Thailand Frankfurt Institute for Advanced Studies Ruth-Moufang-Str. 1 Frankfurt am Main60438 Germany Institut für Theoretische Physik Goethe Universität Frankfurt Max-von-Laue-Strasse 1 Frankfurt am MainD-60438 Germany GSI Helmholtzzentrum für Schwerionenforschung GmbH Planckstr. 1 Darmstadt64291 Germany John von Neumann-Institut für Computing Forschungzentrum Jülich Jülich52425 Germany

UrQMd phase-space coalescence calculations for the production of deuterons are compared with available data for various reactions from the GSI/FAIr energy regime over the CErN-SPS/rHICBES region up to LHC energies. It is found that the production process of deuterons, as reflected in their rapidity and transverse momentum distributions in p+p, p+A and A+A collisions in the mentioned energy regime are in good agreement with experimental data. We further explore the energy and centrality dependence of the d/p and d¯/p¯ ratios and compare with thermal model results. Finally, we discuss anti-deuteron production for selected systems. Overall, a good description of the experimental data is observed. Most importantly this good description is based only on a single set of coalescence parameters that is independent of energy and system size and can also be applied for anti-deuterons. Copyright © 2018, The Authors. All rights reserved.

关键词： deuterium

Few-nucleon and many-nucleon systems with semilocal coordinate-space regularized chiral nucleon-nucleon forces

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Physical review C 2018年第1期98卷 014002-014002页

作者： S. Binder A. Calci E. Epelbaum r. J. Furnstahl J. Golak K. Hebeler T. Hüther H. Kamada H. Krebs P. Maris Ulf-G. Meißner A. Nogga r. roth r. Skibiński K. Topolnicki J. P. Vary K. Vobig H. Witała Department of Physics and Astronomy University of Tennessee Knoxville Tennessee 37996 USA Physics Division Oak Ridge National Laboratory Oak Ridge Tennessee 37831 USA TRIUMF 4004 Wesbrook Mall Vancouver British Columbia V6T 2A3 Canada Institut für Theoretische Physik II Ruhr-Universität Bochum D-44780 Bochum Germany Department of Physics The Ohio State University Columbus Ohio 43210 USA M. Smoluchowski Institute of Physics Jagiellonian University PL-30348 Kraków Poland Institut für Kernphysik Technische Universität Darmstadt 64289 Darmstadt Germany Department of Physics Faculty of Engineering Kyushu Institute of Technology Kitakyushu 804-8550 Japan Department of Physics and Astronomy Iowa State University Ames Iowa 50011 USA Helmholtz-Institut für Strahlen- und Kernphysik and Bethe Center for Theoretical Physics Universität Bonn D-53115 Bonn Germany Institut für Kernphysik Institute for Advanced Simulation and Jülich Center for Hadron Physics Forschungszentrum Jülich D-52425 Jülich Germany JARA-High Performance Computing Forschungszentrum Jülich D-52425 Jülich Germany

We employ a variety of ab initio methods, including Faddeev-Yakubovsky equations, no-core configuration interaction approach, coupled-cluster theory, and in-medium similarity renormalization group, to perform a comprehensive analysis of the nucleon-deuteron elastic and breakup reactions and selected properties of light and medium-mass nuclei up to Ca48 using the recently constructed semilocal coordinate-space regularized chiral nucleon-nucleon potentials. We compare the results with those based on selected phenomenological and chiral EFT two-nucleon potentials, discuss the convergence pattern of the chiral expansion, and estimate the achievable theoretical accuracy at various chiral orders using an approach to quantify truncation errors of the chiral expansion without relying on cutoff variation. We also address the robustness of this method and explore alternative ways to estimate the theoretical uncertainty from the truncation of the chiral expansion.

关键词： Few-body systems Nuclear forces

reciprocal skin effect and its realization in a topolectrical circuit

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Physical review research 2020年第2期2卷 023265-023265页

作者： Tobias Hofmann Tobias Helbig Frank Schindler Nora Salgo Marta Brzezińska Martin Greiter Tobias Kiessling david Wolf Achim Vollhardt Anton Kabaši Ching Hua Lee Ante Bilušić ronny Thomale Titus Neupert Institute for Theoretical Physics and Astrophysics University of Würzburg Am Hubland D-97074 Würzburg Germany Department of Physics University of Zurich Winterthurerstrasse 190 8057 Zurich Switzerland Kavli Institute for Theoretical Physics University of California Santa Barbara California 93106 USA Department of Theoretical Physics Faculty of Fundamental Problems of Technology Wrocław University of Science and Technology 50-370 Wrocław Poland Physikalisches Institut and Röntgen Research Center for Complex Material Systems Universität Würzburg D-97074 Würzburg Germany Centre of Excellence STIM University of Split Poljička cesta 35 HR-21000 Split Croatia Department of Physics National University of Singapore Singapore 117542 Institute of High Performance Computing A*STAR Singapore 138632 University of Split Faculty of Science Ruđera Boškovića 33 HR-21000 Split Croatia

A system is non-Hermitian when it exchanges energy with its environment and nonreciprocal when it behaves differently upon the interchange of input and response. Within the field of metamaterial research on synthetic topological matter, the skin effect describes the conspiracy of non-Hermiticity and nonreciprocity to yield extensive anomalous localization of all eigenmodes in a (quasi) one-dimensional geometry. Here, we introduce the reciprocal skin effect, which occurs in non-Hermitian but reciprocal systems in two or more dimensions: Eigenmodes with opposite longitudinal momentum exhibit opposite transverse anomalous localization. We experimentally demonstrate the reciprocal skin effect in a passive rLC circuit, suggesting convenient alternative implementations in optical, acoustic, mechanical, and related platforms. Skin mode localization brings forth potential applications in directional and polarization detectors for electromagnetic waves.

关键词： Classical transport Edge states Electromagnetism Electronic structure Impedance Metrology Photonics Skin effect Topological materials Tight-binding model

Pion transition form factor from twisted-mass lattice QCd and the hadronic light-by-light π0-pole contribution to the muon g−2

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Physical review d 2023年第9期108卷 094514-094514页

作者： C. Alexandrou S. Bacchio G. Bergner S. Burri J. Finkenrath A. Gasbarro K. Hadjiyiannakou K. Jansen G. Kanwar B. Kostrzewa G. Koutsou K. Ottnad M. Petschlies F. Pittler F. Steffens C. Urbach U. Wenger Department of Physics University of Cyprus 20537 Nicosia Cyprus Computation-based Science and Technology Research Center The Cyprus Institute 20 Konstantinou Kavafi Street 2121 Nicosia Cyprus University of Jena Institute for Theoretical Physics Max-Wien-Platz 1 D-07743 Jena Germany Albert Einstein Center for Fundamental Physics Institute for Theoretical Physics University of Bern Sidlerstrasse 5 CH–3012 Bern Switzerland Bergische Universität Wuppertal Gaußstraße 20 42119 Wuppertal Germany Deutsches Elektronen-Synchrotron DESY Platanenallee 6 15738 Zeuthen Germany High Performance Computing and Analytics Lab Rheinische Friedrich-Wilhelms-Universität Bonn Friedrich-Hirzebruch-Allee 8 D-53115 Bonn Germany PRISMA+ Cluster of Excellence and Institut für Kernphysik Johannes Gutenberg-Universität Mainz Johann-Joachim-Becher-Weg 45 D-55128 Mainz Germany HISKP (Theory) Rheinische Friedrich-Wilhelms-Universität Bonn Nussallee 14-16 D-53115 Bonn Germany Bethe Center for Theoretical Physics Rheinische Friedrich-Wilhelms-Universität Bonn Wegelerstraße 10 D-53115 Bonn Germany

The neutral pion generates the leading pole contribution to the hadronic light-by-light tensor, which is given in terms of the nonperturbative transition form factor Fπ0γγ(q12,q22). Here we present an ab-initio lattice calculation of this quantity in the continuum and at the physical point using twisted-mass lattice QCd. We report our results for the transition form factor parametrized using a model-independent conformal expansion valid for arbitrary spacelike kinematics and compare it with experimental measurements of the single-virtual form factor, the two-photon decay width, and the slope parameter. We then use the transition form factors to compute the pion-pole contribution to the hadronic light-by-light scattering in the muon g−2, finding aμπ0−pole=56.7(3.2)×10−11.

关键词： Lattice field theory Magnetic moment Pions Form factors Ab initio calculations Lattice QCd Path-integral Monte Carlo

Pseudoscalar-pole contributions to the muon g-2 at the physical point

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arXiv 2022年

作者： Burri, S. Kanwar, G. Alexandrou, C. Bacchio, S. Bergner, G. Finkenrath, J. Gasbarro, A. Hadjiyiannakou, K. Jansen, K. Kostrzewa, B. Koutsou, G. Ottnad, K. Petschlies, M. Pittler, F. Steffens, F. Urbach, C. Wenger, U. Albert Einstein Center for Fundamental Physics Institute for Theoretical Physics University of Bern Sidlerstrasse 5 BernCH–3012 Switzerland Department of Physics University of Cyprus Nicosia20537 Cyprus Computation-based Science and Technology Research Center The Cyprus Institute 20 Konstantinou Kavafi Street Nicosia2121 Cyprus University of Jena Institute for Theoretical Physics Max-Wien-Platz 1 JenaD-07743 Germany Deutsches Elektronen-Synchrotron DESY Platanenallee 6 Zeuthen15738 Germany High Performance Computing and Analytics Lab Rheinische Friedrich-Wilhelms-Universität Bonn Friedrich-Hirzebruch-Allee 8 BonnD-53115 Germany PRISMA+ Cluster of Excellence Institut für Kernphysik Johannes Gutenberg-Universität Mainz Johann-Joachim-Becher-Weg 45 MainzD-55128 Germany Rheinische Friedrich-Wilhelms-Universität Bonn Nussallee 14-16 BonnD-53115 Germany Bethe Center for Theoretical Physics Rheinische Friedrich-Wilhelms-Universität Bonn Wegelerstraße 10 BonnD-53115 Germany

Pseudoscalar-pole diagrams are an important component of estimates of the hadronic light-by-light (HLbL) contribution to the muon g − 2. We report on our computation of the transition form factors Fp→γ∗γ∗ for the neutral pseudoscalar mesons P = π0 and η. The calculation is performed using twisted-mass lattice QCd with physical quark masses. On the lattice, we have access to a broad range of (space-like) photon four-momenta and therefore produce form factor data complementary to the experimentally accessible single-virtual direction, which directly leads to an estimate of the pion- and η-pole components of the muon g − 2. For the pion, our result for the g − 2 contribution in the continuum is comparable with previous lattice and data-driven determinations, with combined relative uncertainties below 10%. For the η meson, we report on a preliminary determination from a single lattice spacing. Copyright © 2022, The Authors. All rights reserved.

关键词： Poles

Pion-pole contribution to HLbL from twisted mass lattice QCd at the physical point

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arXiv 2021年

作者： Burri, S. Alexandrou, C. Bacchio, S. Bergner, G. Finkenrath, J. Gasbarro, A. Hadjiyiannakou, K. Jansen, K. Kostrzewa, B. Koutsou, G. Ottnad, K. Petschlies, M. Pittler, F. Steffens, F. Urbach, C. Wenger, U. Albert Einstein Center for Fundamental Physics Institute for Theoretical Physics University of Bern Sidlerstrasse 5 BernCH–3012 Switzerland Department of Physics University of Cyprus Nicosia20537 Cyprus Computation-based Science and Technology Research Center The Cyprus Institute 20 Konstantinou Kavafi Street Nicosia2121 Cyprus University of Jena Institute for Theoretical Physics Max-Wien-Platz 1 JenaD-07743 Germany Deutsches Elektronen-Synchrotron DESY Platanenallee 6 Zeuthen15738 Germany High Performance Computing and Analytics Lab Rheinische Friedrich-Wilhelms-Universität Bonn Friedrich-Hirzebruch-Allee 8 BonnD-53115 Germany PRISMA+ Cluster of Excellence and Institut für Kernphysik Johannes Gutenberg-Universität Mainz Johann-Joachim-Becher-Weg 45 MainzD-55128 Germany Rheinische Friedrich-Wilhelms-Universität Bonn Nussallee 14-16 BonnD-53115 Germany Bethe Center for Theoretical Physics Rheinische Friedrich-Wilhelms-Universität Bonn Wegelerstraße 10 BonnD-53115 Germany

We report on our computation of the pion transition form factor Fπ→γ∗γ∗ from twisted mass lattice QCd in order to determine the numerically dominant light pseudoscalar pole contribution in the hadronic light-by-light scattering contribution to the anomalous magnetic moment of the muon aμ = (g − 2)μ. The pion transition form factor is computed directly at the physical point. We present first results for our estimate of the pion-pole contribution with kinematic setup for the pion at rest. Copyright © 2021, The Authors. All rights reserved.

关键词： Quantum theory

Variation of Uncertainty of drainage density in Flood Hazard Mapping Assessment with Coupled 1d-2d Hydrodynamics Model

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Research Square

research Square 2021年

作者： Yang, Song-Yue Chang, Che-Hao Hsu, Chih-Tsung Wu, Shiang-Jen Department of Urban Planning and Spatial Information Feng Chia University No.100 Wenhwa Rd. Seatwen Dist. Taichung40724 Taiwan Department of Civil Engineering National Taipei University of Technology No. 1 Sec. 3 Zhongxiao E. Rd. Taipei10608 Taiwan National Center for High-Performance Computing National Applied Research Laboratories No. 7 R&D 6th Rd. Hsinchu Science Park Hsinchu30076 Taiwan Department of Civil and Disaster Prevention Engineering National United University No. 2 Lienda Miaoli360001 Taiwan

Coupled 1d-2d hydrodynamic models are widely utilized in flood hazard mapping. researchers have explored several uncertainties in flood hazard mapping, but have not addressed the uncertainty of drainage density. drainage density is equal to total length of the drainage divided by the catchment area. The model sets denser the tributary drainages for higher drainage density values. This study uses a designed case and a real case, Yanshuixi drainage in Tainan, Taiwan, to assess the uncertainty of drainage density in flood hazard mapping. Analytical results indicate that under the same return period rainfall, reduction in tributary drainages in a model (indicating a lower drainage density) results in an underestimate of the flooded area in tributary drainages. This underestimate causes higher peak discharges and total volume of discharges in the drainages, leading to flooding in certain downstream reaches, thereby overestimating the flooded area. The uncertainty of drainage density decreases with increased rainfall. We suggest that modeling flood hazard mapping with low return period rainfalls requires tributary drainages. For extreme rainfall events, a lower drainage density could be selected, but the drainage density of local key areas should be raised. © 2021, CC BY.

关键词： rain

Pion Transition Form Factor from Twisted-Mass Lattice QCd and the Hadronic Light-by-Light π0-pole Contribution to the Muon g − 2

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arXiv 2023年

作者： Alexandrou, C. Bacchio, S. Bergner, G. Burri, S. Finkenrath, J. Gasbarro, A. Hadjiyiannakou, K. Jansen, K. Kanwar, G. Kostrzewa, B. Koutsou, G. Ottnad, K. Petschlies, M. Pittler, F. Steffens, F. Urbach, C. Wenger, U. Department of Physics University of Cyprus Nicosia20537 Cyprus Computation-based Science and Technology Research Center The Cyprus Institute 20 Konstantinou Kavafi Street Nicosia2121 Cyprus University of Jena Institute for Theoretical Physics Max-Wien-Platz 1 JenaD-07743 Germany Albert Einstein Center for Fundamental Physics Institute for Theoretical Physics University of Bern Sidlerstrasse 5 BernCH–3012 Switzerland Bergische Universität Wuppertal Gaußstraße 20 Wuppertal42119 Germany Deutsches Elektronen-Synchrotron DESY Platanenallee 6 Zeuthen15738 Germany High Performance Computing and Analytics Lab Rheinische Friedrich-Wilhelms-Universität Bonn Friedrich-Hirzebruch-Allee 8 BonnD-53115 Germany PRISMA+ Cluster of Excellence Institut für Kernphysik Johannes Gutenberg-Universität Mainz Johann-Joachim-Becher-Weg 45 MainzD-55128 Germany Rheinische Friedrich-Wilhelms-Universität Bonn Nussallee 14-16 BonnD-53115 Germany Bethe Center for Theoretical Physics Rheinische Friedrich-Wilhelms-Universität Bonn Wegelerstraße 10 BonnD-53115 Germany

The neutral pion generates the leading pole contribution to the hadronic light-by-light tensor, which is given in terms of the nonperturbative transition form factor (formula presented). Here we present an ab-initio lattice calculation of this quantity in the continuum and at the physical point using twisted-mass lattice QCd. We report our results for the transition form factor parameterized using a model-independent conformal expansion valid for arbitrary space-like kinematics and compare it with experimental measurements of the single-virtual form factor, the two-photon decay width, and the slope parameter. We then use the transition form factors to compute the pion-pole contribution to the hadronic light-by-light scattering in the muon g − 2, finding (formula presented). Copyright © 2023, The Authors. All rights reserved.

关键词： Poles