Article
Astronomy & Astrophysics
Dongyan Fu, Bao-Dong Sun, Yubing Dong
Summary: In this work, the electromagnetic and gravitational form factors of a spin-3/2 particle, ?? resonance, are simultaneously calculated using a relativistic covariant quark-diquark approach. The obtained form factors are in good agreement with experimental data and comparable to other methods. Additionally, the gravitational form factors giving mechanical properties of the ?? isobar are provided, along with discussions on the sign and interpretation of the D term.
Article
Physics, Particles & Fields
June-Young Kim, Bao-Dong Sun
Summary: This work presents the general form of gravitational form factors for a spin-3/2 baryon, exploring the relationship between EMT densities and GFFs. Through studying nucleon and Delta GFFs within the SU(2) Skyrme model based on the large Nc limit, the general relations proposed were verified.
EUROPEAN PHYSICAL JOURNAL C
(2021)
Article
Physics, Multidisciplinary
Matteo Fael, Fabian Lange, Kay Schoenwald, Matthias Steinhauser
Summary: This article calculates the three-loop nonsinglet corrections to the photon-quark form factors, considering the virtuality of the photon and the quark mass. By combining the method of differential equations with expansions around regular and singular points, the results for the form factors are obtained with an accuracy of about eight to twelve digits in the whole kinematic range.
PHYSICAL REVIEW LETTERS
(2022)
Article
Physics, Nuclear
Mohammad Ahmady, Dipankar Chakrabarti, Chandan Mondal, Ruben Sandapen
Summary: In this study, spin-improved holographic light front wavefunctions were constructed for nucleons, accurately predicting their electromagnetic properties. The research suggests that mesons and nucleons might share a universal holographic light-front wavefunction.
Article
Astronomy & Astrophysics
Xuan-Bo Tong, Jian-Ping Ma, Feng Yuan
Summary: In this study, perturbative QCD analysis was conducted on the gluonic gravitational form factors (GFFs) of the proton and pion at large momentum transfer, revealing scaling behavior with respect to the momentum transfer. The explicit factorization formula of the GFFs in terms of distribution amplitudes of hadrons was derived, offering a unique perspective on the momentum dependence of the GFFs and improving understanding of the internal pressure distributions of hadrons.
Article
Astronomy & Astrophysics
Chentao Tan, Zhun Lu
Summary: In this study, we calculate the quasi-distributions of the leading-twist T-odd quarks in a spectator model with scalar and axial-vector diquarks. We find that these quasi-distributions are fair approximations to the standard distributions under certain conditions.
Article
Physics, Particles & Fields
Minaya Allahverdiyeva, Shahin Mamedov
Summary: We investigated the vector meson's gravitational form factors (GFFs) and generalized parton distributions (GPDs) at finite temperatures using the soft-wall AdS/QCD model. The plotted soft-wall GFFs graphs at zero temperature showed similar results to the hard-wall results. The dependence of the GFFs and GPDs on temperature was studied using the thermal dilaton approach in the soft-wall model. The plots of thermal GFFs showed a decrease with increasing temperature, and the gravitational radius of the meson decreased and became zero at the critical temperature T-c = 0.2 GeV. GPDs at zero skewness were plotted and analyzed at zero and finite temperature cases.
EUROPEAN PHYSICAL JOURNAL C
(2023)
Article
Astronomy & Astrophysics
Jung-Min Suh, Yu-Son Jun, Hyun-Chul Kim
Summary: We investigate the axial-vector transition form factors of the baryon octet to the baryon decuplet within the framework of the chiral quark-soliton model, including the effects of flavor SU(3) symmetry breaking. Our results are compared with those from other models and lattice QCD, and are found to be in good agreement with the T2K data. We also extract the value of the axial-vector mass from the data.
Article
Physics, Particles & Fields
Yong-Hui Lin, Hans-Werner Hammer, Ulf-G. Meissner
Summary: The electromagnetic form factors of the Lambda hyperon in the time-like region are precisely determined through a dispersion-theoretical analysis of world data. Different scenarios are tested and a good description of the data is obtained in the time-like region. The uncertainties in the form factors are estimated and the magnetic radius is predicted when the electric Lambda radius is taken as a constraint. Various vector meson to baryon coupling constants are also extracted.
EUROPEAN PHYSICAL JOURNAL C
(2022)
Article
Astronomy & Astrophysics
R. J. Hernandez-Pinto, L. X. Gutierrez-Guerrero, A. Bashir, M. A. Bedolla, I. M. Higuera-Angulo
Summary: We conduct a comprehensive survey on the electromagnetic form factors of pseudoscalar and scalar mesons. Our analysis uses a Schwinger-Dyson equations treatment with a vector x vector contact interaction, ensuring the satisfaction of axial vector and vector Ward-Takahashi identities and their corollaries such as the Goldberger-Treiman relations. The simplicity of the model allows us to compute the form factors at large virtualities with relative ease. We compare our results with previous studies and experimental observations.
Article
Astronomy & Astrophysics
Ulas Ozdem
Summary: In this study, we investigate the magnetic and quadrupole moments of the Bc-like ground state tetraquarks using the molecular and diquark-antidiquark pictures. Numerical analysis is conducted with different forms of interpolating currents and photon distribution amplitudes. The obtained results show significant differences between the two pictures, and the nonzero but small quadrupole moments indicate non-spherical charge distributions. Experimental measurements of the magnetic moments can provide insights into the internal structure of these states.
Article
Astronomy & Astrophysics
Ulrich Sauerwein, Matthias F. M. Lutz, Rob G. E. Timmermans
Summary: In this study, axial-vector form factors of the baryon octet are considered within the framework of flavor-SU(3) chiral perturbation theory. The baryon octet and decuplet, as well as the pseudoscalar-meson octet, are explicitly included. The use of on-shell meson and baryon masses in the one-loop contributions to the axial-vector form factors and their consistent treatment in terms of chiral power counting are explored. The convergence properties of this approach are examined, and the potential for comparison to upcoming QCD lattice data is discussed.
Article
Astronomy & Astrophysics
Peng Cheng, Fernando E. Serna, Zhao-Qian Yao, Chen Chen, Zhu-Fang Cui, Craig D. Roberts
Summary: This study computes the octet baryon axial, induced pseudoscalar, and pseudoscalar form factors using a symmetry-preserving treatment. The results are consistent with small violations of SU(3)-flavor symmetry.
Article
Physics, Nuclear
Pei-Lin Yin, Chen Chen, Christian S. Fischer, Craig D. Roberts
Summary: A parameter-free prediction for six Delta-baryon elastic weak form factors using a quark + diquark Faddeev equation treatment is presented. The results show two distinct classes of Delta-baryon form factors, each with separate links through partial conservation of axial current and Goldberger-Treiman relations. The study also reveals the structural features of these form factors and provides information on the π-Δ-Δ coupling.
EUROPEAN PHYSICAL JOURNAL A
(2023)
Article
Astronomy & Astrophysics
A. F. Krutov, V. E. Troitsky
Summary: In this study, we use a version of instant-form relativistic quantum mechanics to calculate the gravitational form factors of the pion, taking into account the gravitational structure of constituent quarks. The results show that the form factors are almost insensitive to the type of quark wave function model, similar to the case of the pion electromagnetic form factor.
Article
Physics, Multidisciplinary
Chao Shi, Ian C. Cloet
PHYSICAL REVIEW LETTERS
(2019)
Article
Physics, Multidisciplinary
Kyle D. Bednar, Ian C. Cloet, Peter C. Tandy
PHYSICAL REVIEW LETTERS
(2020)
Article
Instruments & Instrumentation
M. Jadhav, W. Armstrong, I. Cloet, S. Joosten, S. M. Mazza, J. Metcalfe, Z. -E. Meziani, H. F. -W. Sadrozinski, B. Schumm, A. Seiden
Summary: This study demonstrates the feasibility of achieving 10 ps timing resolution for particle identification in the TOPSiDE detector concept, utilizing LGADs with thicknesses of 35 µm and 50 µm. The performance of gain and timing response is evaluated under different operating conditions, with the best timing resolution achieved using three planes of 35 µm thick LGADs at -30 degrees C.
JOURNAL OF INSTRUMENTATION
(2021)
Article
Physics, Nuclear
X. G. Wang, W. Bentz, I. C. Cloet, A. W. Thomas
Summary: We investigate the gluonic structure of nuclei and find considerable nuclear modifications of the gluon distributions in nuclear matter.
JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS
(2022)
Article
Astronomy & Astrophysics
Adam Freese, Ian C. Cloet, Peter C. Tandy
Summary: The study elucidates the importance of the interrelation between quark and gluon parton densities at the intrinsic scale in explaining mass generation and nucleon structure. By describing the relationship between quark and gluon dressing, the research provides insights into the observables related to the quark-gluon structure within hadrons.
Article
Physics, Nuclear
Wolfgang Bentz, Ian C. Cloet
Summary: In the first part, we study the symmetry energy and its slope parameter L for nuclear matter, and derive an exact relation between them. In the second part, we discuss the general structure of three-particle interactions in nuclear matter and analyze their connections to other theories.
Article
Physics, Nuclear
Caroline S. R. Costa, Adam Freese, Ian C. Cloet, Bruno El-Bennich, Gastao Krein, Peter C. Tandy
Summary: A quark target model incorporating intrinsic glue into effective low-energy QCD models is constructed to ensure gauge invariance of observables. Comparing covariant and light cone gauges reveals the importance of Wilson line contributions in covariant gauges. Ultimately, this research highlights the significance of accounting for Wilson line contributions in quantum correlation function calculations in covariant gauges.
Article
Astronomy & Astrophysics
Constantia Alexandrou, Simone Bacchio, Ian Cloet, Martha Constantinou, Kyriakos Hadjiyiannakou, Giannis Koutsou, Colin Lauer
Summary: This study presents a calculation of the pion and kaon Mellin moments extracted directly in lattice QCD using a three-derivative local operator. The results are converted to the MS scheme and evolved at a scale of 2 GeV with three-loop expressions in perturbation theory. Excited states contamination is evaluated to determine the systematic error and additional analyses are performed to reconstruct the x-dependence of the pion and kaon PDFs.
Article
Physics, Nuclear
Adam Freese, Ian C. Cloet
Summary: In this study, the leading-twist helicity-dependent generalized parton distributions of the proton were calculated using the NJL model in QCD, leading to the determination of the proton's spin decomposition. The inclusion of multiple species of diquarks was found to significantly impact the flavor decomposition, emphasizing the importance of understanding the internal structure of these dynamical diquark correlations for the mechanical stability of the proton. The results revealed the intrinsic spin and orbital angular momentum of up and down quarks, as well as the total angular momentum of gluons, showing that the down quark carries almost no total angular momentum due to cancellations between spin and orbital contributions. Comparisons were made with lattice QCD calculations.
Article
Astronomy & Astrophysics
Constantia Alexandrou, Simone Bacchio, Ian Cloet, Martha Constantinou, Kyriakos Hadjiyiannakou, Giannis Koutsou, Colin Lauer
Summary: The study calculates the quark momentum fractions and third Mellin moments for π mesons and kaons, obtaining results for these particles. By analyzing light quarks, strange quarks, and charm quarks, differences in the behavior of these quarks in different particles are demonstrated.
Article
Physics, Nuclear
Takehiro Tanimoto, Wolfgang Bentz, Ian C. Cloet
Article
Astronomy & Astrophysics
Chao Shi, Kyle Bednar, Ian C. Cloet, Adam Freese
Article
Physics, Nuclear
Adam Freese, Ian C. Cloet
Article
Physics, Nuclear
Wolfgang Bentz, Ian C. Cloet
Article
Physics, Nuclear
Adam Freese, Ian C. Cloet
