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How many vector charmoniumlike states lie in the mass range 4.2–4.35 GeV?

Physical Review D 2024年第11期109卷 116002-116002页

作者： Leon von Detten Vadim Baru Christoph Hanhart Qian Wang Daniel Winney Qiang Zhao Institute for Advanced Simulation Institut für Kernphysik and Jülich Center for Hadron Physics Forschungszentrum Jülich D-52425 Jülich Germany Institut für Theoretische Physik II Ruhr-Universität Bochum D-44780 Bochum Germany Key Laboratory of Atomic and Subatomic Structure and Quantum Control (MOE) Guangdong Basic Research Center of Excellence for Structure and Fundamental Interactions of Matter Institute of Quantum Matter South China Normal University Guangzhou 510006 China Guangdong-Hong Kong Joint Laboratory of Quantum Matter Guangdong Provincial Key Laboratory of Nuclear Science Southern Nuclear Science Computing Center South China Normal University Guangzhou 510006 China Institute of High Energy Physics Chinese Academy of Sciences Beijing 100049 China Helmholtz-Institut für Strahlen- und Kernphysik and Bethe Center for Theoretical Physics Universität Bonn D-53115 Bonn Germany School of Physical Sciences University of Chinese Academy of Sciences Beijing 100049 China

In recent years many vector charmonium(like) states were reported by different electron-positron collider experiments above 4.2 GeV. However, so far, there not only exists sizable tension in the parameters of those states, but there is also no consensus on the number of the vector states in this energy range. To some extend, this might be caused by the fact that the experimental data were typically analyzed in single channel analyses employing overlapping Breit-Wigner functions, in particular ignoring the effect of opening thresholds. In this study, we focus on the mass range between 4.2 GeV and 4.35 GeV, conducting a comprehensive analysis of eight different final states in e+e− annihilation. Our findings demonstrate that, within this mass range, a single vector charmoniumlike state, exhibiting properties consistent with a D1D¯ molecular structure and characterized by a pole location spoleY(4230)=(4227±4−i2(50−2+8)) MeV, can effectively describe all the collected data. This is made possible by allowing for an interference with the well-established vector charmonium ψ(4160) along with the inclusion of the D1D¯ threshold effect. Moreover, in contrast to experimental analyses, our study reveals that the highly asymmetric total cross sections for e+e−→J/ψππ and e+e−→J/ψKK¯ around 4230 MeV stem from the same physics, rooted in the approximate SU(3) flavor symmetry of QCD.

关键词： Bound states Multiquark bound states Particle decays Perturbation theory Phenomenology Charmed mesons Exotic mesons

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Broken poloidal symmetry and plasmonic eigenmodes on a torus

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Physical Review B 2020年第11期101卷 115426-115426页

作者： Tharindu Warnakula Sarath D. Gunapala Mark I. Stockman Malin Premaratne Advanced Computing and Simulation Laboratory (AχL) Department of Electrical and Computer Systems Engineering Monash University Clayton Vic 3800 Australia Jet Propulsion Laboratory California Institute of Technology Pasadena California 91109 USA Department of Physics and Astronomy Georgia State University Atlanta Georgia 30303 USA

We study the poloidal modes (modes whose variations are strictly along the direction of the torus axis) of toroidal nanoparticles. We show that the modes may be understood in terms of the symmetry breaking that occurs when an infinite cylinder is folded to form a torus. This symmetry breaking results in the splitting of the transverse cylinder modes into two distinct sets of modes on a torus. One set of these modes was known to exist already. We show the existence of the second set and also analytically derive the surface charge structure for that set of modes. We also consolidate recent advances made in studying the modal structure on torus particles and complete our understanding of the plasmonic modes of a torus.

关键词： Electromagnetic field calculations Plasmonics Surface plasmons Nanoparticles

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Microscopic theory of spin relaxation of a single Fe adatom coupled to substrate vibrations

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Physical Review B 2023年第14期107卷 144417-144417页

作者： Haritz Garai-Marin Manuel dos Santos Dias Samir Lounis Julen Ibañez-Azpiroz Asier Eiguren Physics Department University of the Basque Country UPV/EHU 48080 Bilbao Basque Country Spain Donostia International Physics Center (DIPC) Paseo Manuel de Lardizabal 4 20018 Donostia-San Sebastián Spain Peter Grünberg Institut and Institute for Advanced Simulation Forschungszentrum Jülich & JARA 52425 Jülich Germany Faculty of Physics University of Duisburg-Essen & CENIDE 47053 Duisburg Germany Scientific Computing Department STFC Daresbury Laboratory Warrington WA4 4AD United Kingdom Centro de Física de Materiales Universidad del País Vasco UPV/EHU 20018 San Sebastián Spain IKERBASQUE Basque Foundation for Science 48013 Bilbao Spain EHU Quantum Center University of the Basque Country UPV/EHU 48940 Leioa Spain

Understanding the spin-relaxation mechanism of single adatoms is an essential step towards creating atomic magnetic memory bits or even qubits. Here, we present an essentially parameter-free theory by combining ab initio electronic and vibrational properties with the many-body nature of atomic states. Our calculations account for the millisecond spin lifetime measured recently on Fe adatoms on MgO/Ag(100) and reproduce the dependence on the number of decoupling layers and the external magnetic field. We show how the atomic interaction with the environment should be tuned in order to enhance the magnetic stability, and propose a clear fingerprint for experimentally detecting a localized spin-phonon excitation.

关键词： Spin-phonon coupling Atomic systems Crystal-field theory First-principles calculations Many-body techniques

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Accurate ECG Data Generation with a Simple Generative Adversarial Network

Accurate ECG Data Generation with a Simple Generative Advers...

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作者： Haiyan Wang Zhaoyang Ge Zongmin Wang Collaborative Innovation Centre for Internet Healthcare Zhengzhou University State Key Laboratory of Mathematical Engineering and Advanced Computing Simulation Experiment Centre Zhengzhou University of Aeronautics School of Information Engineering Zhengzhou University

Since ECG data is highly sensitive medical data, the acquisition of ECG data is highly restricted. However, with the increasing demand for ECG big data research, the improvement of computer computing capabilities, and the development of deep learning, the direction of ECG intelligent analysis is facing a serious lack of standard clinical data. In order to generate more precise ECG data, this paper proposes a GAN architecture for generating ECG heartbeat data. The network structure is simple and does not require any domain knowledge. In this paper, the MIT-BIH Arrhythmia database is selected, from which all left bundle branch block heartbeats are selected to form a training dataset. The training process shows that the proposed GAN structure is effective and accurate, and the generated results show that not only the generated simulated ECG heartbeat data is diverse, but also highly similar to the real data.

关键词： ECG data generation heartbeat left bundle branch block deep learning model GAN

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Higgs mode and stability of xy-orbital ordering in Ca2RuO4

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Physical Review B 2020年第20期101卷 205128-205128页

作者： Guoren Zhang Eva Pavarini Key Laboratory of Materials Physics Institute of Solid State Physics Chinese Academy of Sciences Hefei 230031 People's Republic of China Institute for Advanced Simulation Forschungszentrum Jülich 52425 Jülich Germany JARA High-Performance Computing 52425 Jülich Germany

We investigate the stability of xy orbital ordering and the nature of the magnetic longitudinal excitations in Ca2RuO4. To this end, we employ the local-density approximation + dynamical mean-field theory approach, in combination with many-body perturbation theory. We show that the crossover to a nonperturbative spin-orbit regime—-in which xy-like orbital ordering is to a large extent quenched—only takes place when the crystal field is sizably reduced with respect to its actual value in Ca2RuO4. In the small crystal-field splitting limit, the spin-orbit interaction favors the metal-to-insulator transition. We find that the effects of the spin-orbit interaction remain perturbative even for the less distorted Ca2−xSrxRuO4 with 0

关键词： Orbital order Ruthenates Strongly correlated systems DFT+DMFT Dynamical mean field theory

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How many vector charmoniumlike states lie in the mass range from 4.2 to 4.35 GeV?

arXiv

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arXiv 2024年

作者： von Detten, Leon Baru, Vadim Hanhart, Christoph Wang, Qian Winney, Daniel Zhao, Qiang Institute for Advanced Simulation Institut für Kernphysik Jülich Center for Hadron Physics Forschungszentrum Jülich JülichD-52425 Germany Institut für Theoretische Physik II Ruhr-Universität Bochum BochumD-44780 Germany Guangdong Basic Research Center of Excellence for Structure and Fundamental Interactions of Matter Institute of Quantum Matter South China Normal University Guangzhou510006 China Guangdong-Hong Kong Joint Laboratory of Quantum Matter Guangdong Provincial Key Laboratory of Nuclear Science Southern Nuclear Science Computing Center South China Normal University Guangzhou510006 China Institute of High Energy Physics Chinese Academy of Sciences Beijing100049 China Helmholtz-Institut für Strahlen- und Kernphysik Bethe Center for Theoretical Physics Universität Bonn BonnD-53115 Germany School of Physical Sciences University of Chinese Academy of Sciences Beijing100049 China

In recent years many vector charmonium(-like) states were reported by different electron-positron collider experiments above 4.2 GeV. However, so far, there not only exists sizable tension in the parameters of those states, but there is also no consensus on the number of the vector states in this energy range. To some extend, this might be caused by the fact that the experimental data were typically analyzed in single channel analyses employing overlapping Breit-Wigner functions, in particular ignoring the effect of opening thresholds. In this study, we focus on the mass range between 4.2 and 4.35 GeV, conducting a comprehensive analysis of eight different final states in e+e− annihilation. Our findings demonstrate that, within this mass range, a single vector charmonium-like state, exhibiting properties consistent with a D1D¯ molecular structure and characterized by a pole location (formula presented), can effectively describe all the collected data. This is made possible by allowing for an interference with the well-established vector charmonium ψ(4160) along with the inclusion of the D1D¯ threshold effect. Moreover, in contrast to experimental analyses, our study reveals that the highly asymmetric total cross sections for e+e− → J/ψππ and e+e− → J/ψKK¯ around 4230 MeV stem from the same physics, rooted in the approximate SU(3) flavor symmetry of QCD. Copyright © 2024, The Authors. All rights reserved.

关键词： Vectors

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Electrical engineering of topological magnetism in two-dimensional heterobilayers

npj Spintronics

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npj Spintronics 2024年第1期2卷 1-8页

作者： Nihad Abuawwad Samir Lounis Hazem Abusara Manuel dos Santos Dias Peter Grünberg Institute and Institute for Advanced Simulation Forschungszentrum Jülich & JARA 52425 Jülich Germany Faculty of Physics University of Duisburg-Essen and CENIDE 47053 Duisburg Germany Department of Physics Birzeit University PO Box 14 Birzeit Palestine Scientific Computing Department STFC Daresbury Laboratory Warrington WA4 4AD UK

The emergence of topological magnetism in two-dimensional (2D) van der Waals (vdW) magnetic materials and their heterostructures is an essential ingredient for next-generation information technology devices. Here, we demonstrate the all-electric switching of the topological nature of individual magnetic objects emerging in 2D vdW heterobilayers. We show from the first principles that an external electric field modifies the vdW gap between CrTe2and (Rh, Ti)Te2layers and alters the underlying magnetic interactions. This enables switching between ferromagnetic skyrmions and meron pairs in the CrTe2/RhTe2heterobilayer while it enhances the stability of frustrated antiferromagnetic merons in the CrTe2/TiTe2heterobilayer. We envision that the electrical engineering of distinct topological magnetic solitons in a single device could pave the way for novel energy-efficient mechanisms to store and transmit information with applications in spintronics.

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Role of Left-Hand Cut Contributions on Pole Extractions from Lattice Data: Case Study for Tcc(3875)+

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Physical Review Letters 2023年第13期131卷 131903-131903页

作者： Meng-Lin Du Arseniy Filin Vadim Baru Xiang-Kun Dong Evgeny Epelbaum Feng-Kun Guo Christoph Hanhart Alexey Nefediev Juan Nieves Qian Wang School of Physics University of Electronic Science and Technology of China Chengdu 611731 China Institut für Theoretische Physik II Ruhr-Universität Bochum D-44780 Bochum Germany CAS Key Laboratory of Theoretical Physics Institute of Theoretical Physics Chinese Academy of Sciences Beijing 100190 China School of Physical Sciences University of Chinese Academy of Sciences Beijing 100049 China Peng Huanwu Collaborative Center for Research and Education Beihang University Beijing 100191 China Institute for Advanced Simulation Institut für Kernphysik and Jülich Center for Hadron Physics Forschungszentrum Jülich D-52425 Jülich Germany Jozef Stefan Institute Jamova 39 1000 Ljubljana Slovenia CeFEMA Center of Physics and Engineering of Advanced Materials Instituto Superior Técnico Avenida Rovisco Pais 1 1049-001 Lisboa Portugal Instituto de Física Corpuscular (centro mixto CSIC-UV) Institutos de Investigación de Paterna Apartado 22085 46071 Valencia Spain Guangdong Provincial Key Laboratory of Nuclear Science Institute of Quantum Matter South China Normal University Guangzhou 510006 China Institute of High Energy Physics Chinese Academy of Sciences Beijing 100049 China Guangdong-Hong Kong Joint Laboratory of Quantum Matter Southern Nuclear Science Computing Center South China Normal University Guangzhou 510006 China

We discuss recent lattice data for the Tcc(3875)+ state to stress, for the first time, a potentially strong impact of left-hand cuts from the one-pion exchange on the pole extraction for near-threshold exotic states. In particular, if the left-hand cut is located close to the two-particle threshold, which happens naturally in the DD* system for the pion mass exceeding its physical value, the effective-range expansion is valid only in a very limited energy range up to the cut and as such is of little use to reliably extract the poles. Then, an accurate extraction of the pole locations requires the one-pion exchange to be implemented explicitly into the scattering amplitudes. Our findings are general and potentially relevant for a wide class of hadronic near-threshold states.

关键词： Hadron-hadron interactions Heavy quark effective theory Lattice QCD Phenomenology Exotic mesons

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Comparison of the permittivity sensing capabilities of graphene-based nanohybrids and metal nanoparticle-based nanohybrids

Comparison of the permittivity sensing capabilities of graph...

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IEEE Conference on Nanotechnology

作者： Viraj Senevirathne Malin Premaratne Advanced Computing and Simulation Laboratory (AχL) Department of Electrical and Computer Systems Engineering Monash University Clayton VIC Australia

Nanohybrid comprising of a nanoresonator and a quantum emitter have shown enhanced optical properties compared to its constituents. Such nanohybrids are highly sensitive to their surrounding medium permittivity, making them suitable for sensing applications which relies on the background permittivity. This feature is a result of the change in resonance conditions in the nanoresonator, which is part of the nanohybrid. Here we investigate how different nanoresonators affect the sensing capabilities of the nanohybrid and use that information to make recommendations on the best nanores-onator for the nanohybrid depending on the application. Our analysis is based on cavity quantum electrodynamics formalism and thus rigorous and accurate. Our results indicate that the graphene resonator based nanohybrids can be used to detect broader permittivity range than MNP based nanohybrids.

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Local spatial densities for composite spin-3/2 systems

arXiv

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arXiv 2022年

作者： Alharazin, H. Sun, B.-D. Epelbaum, E. Gegelia, J. Meißner, U.-G. Institut für Theoretische Physik II Ruhr-Universität Bochum BochumD-44780 Germany Guangdong Provincial Key Laboratory of Nuclear Science Institute of Quantum Matter South China Normal University Guangzhou510006 China Guangdong-Hong Kong Joint Laboratory of Quantum Matter Southern Nuclear Science Computing Center South China Normal University Guangzhou510006 China Helmholtz-Institut für Strahlen- und Kernphysik Bethe Center for Theoretical Physics Universität Bonn BonnD-53115 Germany Tbilisi State University Tbilisi0186 Georgia Institute for Advanced Simulation Institut für Kernphysik Jülich Center for Hadron Physics Forschungszentrum Jülich JülichD-52425 Germany

The definition of local spatial densities by using sharply localized one-particle states is applied to spin-3/2 systems. Matrix elements of the electromagnetic current and the energy-momentum tensor are considered and integral expressions of associated spatial distributions in terms of form factors are derived. © 2022, CC BY.

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