Article
Astronomy & Astrophysics
A. Castro, W. de Paula, T. Frederico, G. Salme
Summary: The Bethe-Salpeter equation for a pseudoscalar bound-system is solved in Minkowski space using the Nakanishi integral representation of the Bethe-Salpeter amplitude, with a ladder kernel featuring massive gluons, dynamically-dressed quark mass function, and an extended quark-gluon vertex. Quark dressing is implemented through a phenomenological ansatz tuned by lattice QCD calculations. The framework allows investigating gluon dynamics in the physical space. The first results for low-density pseudoscalar systems are presented to understand the interplay between gluonic phenomena.
Article
Astronomy & Astrophysics
Jung-Min Suh, Hyun-Chul Kim
Summary: In this study, the axial-vector transition form factors of the lowest-lying singly heavy baryons are investigated using the chiral quark-soliton model. Numerical results are presented and compared with experimental data.
Article
Astronomy & Astrophysics
Hong-Yan Zhou, Fu-Lai Wang, Zhan-Wei Liu, Xiang Liu
Summary: This work discusses the electromagnetic properties of the S-wave Sigma(c**D-) doubly charmed molecular pentaquarks and analyzes the relation between magnetic moments and transition magnetic moments. The study provides a reference for experimental measurements of electromagnetic properties of hadronic molecular states.
Article
Multidisciplinary Sciences
Hangtian Wang, Haichang Lu, Zongxia Guo, Ang Li, Peichen Wu, Jing Li, Weiran Xie, Zhimei Sun, Peng Li, Heloise Damas, Anna Maria Friedel, Sylvie Migot, Jaafar Ghanbaja, Luc Moreau, Yannick Fagot-Revurat, Sebastien Petit-Watelot, Thomas Hauet, John Robertson, Stephane Mangin, Weisheng Zhao, Tianxiao Nie
Summary: In this study, a large-scale iron-based vdW material Fe4GeTe2 with a high Curie temperature (Tc) of around 530 K was developed and its high-temperature ferromagnetism was confirmed by multiple characterizations. Theoretical calculations indicated that the interface-induced right shift of unpaired Fe d electrons' localized states is responsible for the enhanced Tc, which was confirmed by ultraviolet photoelectron spectroscopy. Additionally, by precisely tailoring Fe concentration, arbitrary control of magnetic anisotropy between out-of-plane and in-plane was achieved without inducing any phase disorders. This finding highlights the high potential of Fe4GeTe2 in spintronics, potentially enabling the room-temperature application of all-vdW spintronic devices.
NATURE COMMUNICATIONS
(2023)
Article
Physics, Applied
Mohammad Tomal Hossain, Sergi Lendinez, Laura Scheuer, Evangelos Th. Papaioannou, M. Benjamin Jungfleisch
Summary: In this study, we reported the generation and detection of spin-orbit torque ferromagnetic resonance in micropatterned Fe/Pt bilayers grown by molecular beam epitaxy. Our results demonstrate a simple and efficient method for determining magnetic anisotropies in microstructures using rf spectroscopy. The experimental STFMR measurements were compared with broadband ferromagnetic resonance spectroscopy and magneto-optical Kerr effect measurements to confirm the findings.
APPLIED PHYSICS LETTERS
(2021)
Article
Physics, Particles & Fields
Joe Davighi
Summary: By extending the Standard Model with an anomalous U(1)(X) gauge symmetry, this model aims to explain anomalies in b -> sll transitions and the fermion mass problem. The model features mixed gauge anomalies and requires integrating the masses of charged fermions to eliminate anomalies, while possessing high quality lepton flavor symmetries.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Astronomy & Astrophysics
Xin-Jian Wen, Rui He, Jun-Bing Liu
Summary: In strong magnetic fields, a nonzero anomalous magnetic moment changes the chiral crossover into a first-order phase transition and may lead to inverse magnetic catalysis effect. Additionally, employing a magnetic-field-independent regularization scheme helps avoid vacuum divergence and nonphysical oscillation.
Article
Astronomy & Astrophysics
Mikael Chala, Arsenii Titov
Summary: In this study, the leading-logarithmic correction to the neutrino mass matrix in the Standard Model effective field theory was computed up to dimension seven, revealing the impact of dimension-seven operators on neutrino masses and the modifications introduced by dimension-six operators around the TeV scale. The findings are significant for the renormalization of the SMEFT.
Article
Nanoscience & Nanotechnology
N. Song, Y. X. Huang, K. Ren, J. X. Ding, T. Li, J. K. Zhang, J. L. Xie, Y. H. Xu, Z. H. Ding, J. S. Zhu, Z. Z. Wang, W. Liao, G. Li, L. Wang
Summary: This study focuses on the anomalous Hall effects (AHEs) of Co/Ni multilayers with perpendicular magnetic anisotropy (PMA). An unconventional AHE behavior was discovered, with the AH resistance exhibiting asymmetric double peaks by adding different buffer and top layer materials. Moreover, the Co/Ni multilayers with different neighboring layers showed reverse AH resistance. The AHE behavior can be explained by considering the influence of the external magnetic field on the interfacial spin orbit interaction and the leakage spin current from the neighboring layer.
Article
Astronomy & Astrophysics
Pablo G. Ortega, Jorge Segovia, David R. Entem, Francisco Fernandez
Summary: The recent discovery of the D-s0(2590)(+) meson and its analysis of meson-meson channels effects suggest a non-negligible coupling with the D-(*())K-(*()) channel, resulting in a lower mass than predicted. This study investigates the impact of incorporating nearby meson-meson channels on the mass of the bare c (s) over bar through a coupled-channels calculation.
Article
Astronomy & Astrophysics
Zi-Le Zhang, Zhan-Wei Liu, Si-Qiang Luo, Fu-Lai Wang, Bo Wang, Hao Xu
Summary: In this study, we consider Ac(2910)+ and Ac(2940)+ as conventional udc cores dressed with the D*N channel and provide a possible interpretation for both within the same framework. We also take into account the effects of both the conventional triquark core and the D*N channel, as well as the D*N-D*N interactions. Based on the mass spectrum, the spin parity of Ac(2940)+ is more likely to be 1=2-, while Ac(2910)+ prefers 3=2-. We look forward to future experiments that can test our results with more precise experimental data.
Article
Astronomy & Astrophysics
A. I. Hernandez-Juarez, A. Fernandez-Tellez, G. Tavares-Velasco
Summary: In this study, the one-loop contributions of the standard model to the most general H*Z*Z* coupling are obtained using the background field method and Passarino-Veltman scalar functions. The CMS constraints on the HZZ coupling ratios are then applied to obtain bounds on the anomalous HZZ couplings, and both real and absorptive parts are considered. It is found that the absorptive parts have significant effects on the HZZ decay width at low energies, while the use of polarized Z gauge bosons can provide hints of CP violation.
Article
Physics, Particles & Fields
Shuai Xu, Sibo Zheng
Summary: This paper considers the scenario of composite Higgs with partial compositeness to address the muon g-2 anomaly. It shows that the anomaly can be resolved by a one-loop correction involving composite muon partners with mass scale of order TeVs and large Yukawa coupling to composite Higgs, which is different from interpretations of vectorlike lepton models. The paper presents the parameter space by imposing indirect constraints from precise measurements on Higgs, Z and oblique electroweak parameters. It also analyzes direct constraints in light of both Drell-Yan and Higgs-associated productions of the composite muon partners at high-luminosity LHC. The results indicate that parameter regions with the lighter composite muon mass below approximately 325 GeV can be excluded at the 2 sigma level by the Drell-Yan processes.
EUROPEAN PHYSICAL JOURNAL C
(2022)
Article
Nanoscience & Nanotechnology
Akhil K. Ramesh, Yi-Ting Chou, Mu-Ting Lu, Pushparaj Singh, Yuan-Chieh Tseng
Summary: This paper presents an approach to biological sensing using spintronic devices to detect magnetic particles attached to biological carriers. The proposed sensor offers real-time measurement results and is compatible with semiconductor fabrication technology, allowing for integration with semiconductor chips and reducing manufacturing cost and power consumption.
Article
Astronomy & Astrophysics
Fu-Lai Wang, Hong-Yan Zhou, Zhan-Wei Liu, Xiang Liu
Summary: This study systematically investigates the magnetic moments, the transition magnetic moments, and the radiative decay behaviors of the S-wave isoscalar Xi(('))(c)(D) over bar ((*)) molecular pentaquark states. The results show that their electromagnetic properties can provide important hints for understanding the inner structure of these discussed isoscalar Xi(('))(c)(D) over bar* molecular pentaquarks. It is suggested that future experiments should focus on the electromagnetic properties of these isoscalar Xi(('))(c)(D) over bar(*) molecular pentaquarks, which are a typical hidden-charm molecular pentaquark system with single strangeness.
Article
Physics, Nuclear
Z-F Cui, M. Ding, F. Gao, K. Raya, D. Binosi, L. Chang, C. D. Roberts, J. Rodriguez-Quintero, S. M. Schmidt
Summary: The study discusses the distribution functions of K mesons, compares them with similar distributions of π mesons, and reveals how their light-front momentum is shared. The research provides the first parameter-free predictions for K distribution functions, emphasizing the need for new experiments sensitive to all K and π DFs.
EUROPEAN PHYSICAL JOURNAL A
(2021)
Article
Astronomy & Astrophysics
J-L Zhang, K. Raya, L. Chang, Z-F Cui, J. M. Morgado, C. D. Roberts, J. Rodriguez-Quintero
Summary: The structural properties of π and K mesons provide insights into mass generation in the Standard Model and the modulation by the Higgs boson. Novel effects in impact parameter space and mass and pressure profiles are revealed through generalised parton distributions constructed from light-front wave functions and one-dimensional valence distribution functions. Notably, K pressure profiles are spatially more compact than π profiles, reaching near-core pressures similar to those in neutron stars.
Article
Physics, Nuclear
J. Arrington, C. Ayerbe Gayoso, P. C. Barry, V Berdnikov, D. Binosi, L. Chang, M. Diefenthaler, M. Ding, R. Ent, T. Frederico, Y. Furletova, T. J. Hobbs, T. Horn, G. M. Huber, S. J. D. Kay, C. Keppel, H-W Lin, C. Mezrag, R. Montgomery, I. L. Pegg, K. Raya, P. Reimer, D. G. Richards, C. D. Roberts, J. Rodriguez-Quintero, D. Romanov, G. Salme, N. Sato, J. Segovia, P. Stepanov, A. S. Tadepalli, R. L. Trotta
Summary: The emergence of the bulk of the Universe's visible mass and the mechanisms behind the structure of hadrons are profound questions that are being investigated through the study of pseudoscalar mesons like the pion and kaon. Different approaches such as continuum QCD phenomenology, lattice-regularised QCD, and global analysis of parton distributions are being utilized to explore the partonic structure and mass mechanisms of these mesons. Experimental measurements, including those from the anticipated electron-ion collider, will provide valuable insights into the structures of pions and kaons, aiding in a better understanding of their properties and roles in QCD.
JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS
(2021)
Review
Physics, Nuclear
Craig D. Roberts, David G. Richards, Tanja Horn, Lei Chang
Summary: In the standard model of particle physics, there are two mass generating mechanisms: one related to the Higgs boson which is well understood, and the other embedded in quantum chromodynamics responsible for the emergence of hadronic mass, which remains puzzling. Recent progress has been made using theoretical tools like continuum Schwinger function methods and lattice-regularised QCD to understand these mechanisms better and shed light on Nature's Nambu-Goldstone modes. New experimental facilities are expected to contribute greatly in resolving the puzzles of emergent hadronic mass.
PROGRESS IN PARTICLE AND NUCLEAR PHYSICS
(2021)
Article
Physics, Nuclear
K. Raya, Z. -f. Cui, L. Chang, J. M. Morgado, C. D. Roberts, J. Rodriguez-Quintero
Summary: Observable measures provide clear windows into emergent hadron mass and its modulations by Higgs boson interactions, which can be accessed through generalised parton distributions (GPDs). Analysis reveals various properties and predictions, such as stiffness differences between gravitational and electromagnetic form factors, tightness of K pressure profiles compared to pi profiles, and similar fraction of meson mass-squared carried by glue and sea combined as with the valence degrees-of-freedom.
Article
Physics, Nuclear
Z. -F. Cui, M. Ding, J. M. Morgado, K. Raya, D. Binosi, L. Chang, J. Papavassiliou, C. D. Roberts, J. Rodriguez-Quintero, S. M. Schmidt
Summary: The analysis of the pion valence-quark distribution function predicts that its behavior at x approximately equal to 1 follows the model of (1 - x)(β(σ)), taking into account the pion wave function prescribed by QCD. However, the empirical status of this behavior remains uncertain due to disagreements in fitting existing data. Further experimental data is needed to reach a final conclusion.
EUROPEAN PHYSICAL JOURNAL A
(2022)
Article
Physics, Nuclear
An-Xin Dai, Zhong-Yi Li, Lei Chang, Ju-Jun Xie
Summary: Based on recent measurements by the BESIII collaboration, the effective form factors of the neutron in the time-like region were determined and found to be smaller than those of the proton, showing periodic behavior. A comparative analysis of Lambda, Sigma(0), and Xi(0) hyperons revealed an interesting oscillating behavior in their effective form factors with zero charge, which needs to be confirmed by future experiments. Both theoretical and experimental investigations of this phenomenon can provide insights into the reaction mechanisms of electron-positron annihilation.
Article
Physics, Multidisciplinary
Zhu-Fang Cui, Fei Gao, Daniele Binosi, Lei Chang, Craig D. Roberts, Sebastian M. Schmidt
Summary: This study investigates the ratio of structure functions between proton and neutron using precise data and a robust method, leading to a model-independent result. The consistency challenge raised by this result sheds light on the description of proton structure.
CHINESE PHYSICS LETTERS
(2022)
Article
Astronomy & Astrophysics
Lei Chang, Fei Gao, Craig D. Roberts
Summary: This article uses an algebraic Ansatz to calculate the proton's wave function and distribution functions, and compares it with the pion. The findings suggest some factors that may explain the differences in proton properties.
Article
Astronomy & Astrophysics
Ya Lu, Lei Chang, Khepani Raya, Craig D. Roberts, Jose Rodriguez-Quintero
Summary: This study uses consistent determination of valence distribution functions (DFs) for proton and pion at the same hadron scale, and presents a unified prediction for all DFs including valence, glue, and four-flavour-separated sea. The results show that while identifiable parton classes carry the same hadron light-front momentum fractions for both proton and pion at any scale, the behavior of DFs is strongly dependent on the hadron.
Article
Astronomy & Astrophysics
Zanbin Xing, Minghui Ding, Lei Chang
Summary: We present a novel approach to calculate the gravitational form factor of pion using the ladder approximation of the Bethe-Salpeter equation with contact interactions. A key aspect of this approach is the symmetry-preserving treatment of the dressed pi pi amplitude, which reveals the contributions from intrinsic quarks and bound states, the latter being essential for the D-term of pion in the soft-pion limit. The method we propose in this study can be applied to numerous processes of significance in physics.
Article
Astronomy & Astrophysics
Zanbin Xing, Lei Chang
Summary: This work proposes a symmetry preserving regularization procedure for the contact interaction model. This regularization follows consistency conditions to maintain gauge symmetry. Proofs for preserving the Ward-Takahashi identities are provided, and loop integrals are systematically computed. Application examples of kaon electromagnetic form factor and Kl3 transition form factor demonstrate self-consistent results. The proposed regularization properly handles divergences, allowing more focus on physical discussions.
Article
Astronomy & Astrophysics
Xiaobin Wang, Zanbin Xing, Jiayin Kang, Khepani Raya, Lei Chang
Summary: The pion scalar, vector, and tensor form factors are calculated using a symmetry-preserving contact interaction model and a modified interaction kernel for the Bethe-Salpeter equation. The results show significant improvement and are compatible with recent lattice QCD simulations.
Article
Astronomy & Astrophysics
Z-F Cui, M. Ding, J. M. Morgado, K. Raya, D. Binosi, L. Chang, F. De Soto, C. D. Roberts, J. Rodriguez-Quintero, S. M. Schmidt
Summary: Assuming the existence of an effective charge to define the evolution scheme for parton distribution functions (DFs), this study derives strict lower and upper bounds on all Mellin moments of the valence-quark DFs of pionlike systems. By using numerical simulations of lattice-regularized quantum chromodynamics (QCD) consistent with these bounds, parameter-free predictions for pion valence, glue, and sea DFs are obtained. The study shows that the form of the valence-quark DF is consistent with predictions derived from the QCD-prescribed behavior of the pion wave function.
Article
Astronomy & Astrophysics
Zanbin Xing, Jingyi Chao, Lei Chang, Yu-xin Liu
Summary: This paper studies the properties of a pseudoscalar meson triplet in a strongly magnetized medium using the Dyson-Schwinger equation approach for a contact interaction. A new coupling formulation is proposed to control the strength of the p-wave component without modifying the quark propagator. The results show that the strong magnetic field dramatically affects the inner structure of mesons.
