Article
Astronomy & Astrophysics
Haifa I. Alrebdi, Thabit Barakat
Summary: The radiative Delta(1600) -> gamma N decay was studied within the framework of the light-cone QCD sum rules method (LCSR's), estimating the magnetic dipole moment G(M)(1)(0) and the electric quadrupole moment G(E)(1)(0). The calculated ratio R-EM=-G(E)(1)(0)/G(M)(1)(0) and decay rate show strong agreement with existing experimental results and other available phenomenological approaches.
Article
Astronomy & Astrophysics
Xiao-Hui Chen, Qi-Nan Wang, Wei Chen, Hua-Xing Chen
Summary: This study investigates the mass spectra of N Omega dibaryons in different channels and predicts the existence of a bound state in the S-5(2) channel. The results suggest that N Omega dibaryons in the S-3(1) channel may decay directly into final states in S wave. This research provides insights into the potential identification of these N Omega dibaryons in future relativistic heavy-ion collision experiments.
Article
Physics, Particles & Fields
K. Boguslavski, A. Kurkela, T. Lappi, J. Peuron
Summary: This research focuses on the excitations of far-from-equilibrium 2+1 dimensional gauge theories and finds that their structure is nontrivial and nonperturbative, leading to broad excitation peaks in spectral and statistical correlation functions. The absence of soft quasiparticles in these theories is demonstrated by the comparable width of these peaks to the frequency of soft excitations.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Astronomy & Astrophysics
Lu-Meng Liu, Jun Xu, Guang-Xiong Peng
Summary: The study focuses on rigorous calculations for the pion condensate in the three-flavor Nambu-Jona-Lasinio model and the three-dimensional QCD phase diagram with isovector coupling constants adjusted. Two nonzero solutions of the pion condensate at finite baryon chemical potentials are observed with the increasing isospin chemical potential, representing the pion superfluid phase and the Sarma phase, respectively. Calculation assumptions about the equal constituent mass of u and d quarks can lead to large errors in the QCD phase diagram and affect the position of the critical end point within a certain range of baryon chemical potentials.
Article
Astronomy & Astrophysics
Dibyendu Bala, Olaf Kaczmarek, Rasmus Larsen, Swagato Mukherjee, Gaurang Parkar, Peter Petreczky, Alexander Rothkopf, Johannes Heinrich Weber
Summary: In this study, we investigate the interactions of a static quark-antiquark pair at nonzero temperature using realistic lattice QCD calculations. We compare different analysis methods for extracting the spectral functions and assess their implications for the existence and properties of a well-defined ground state spectral peak.
Correction
Astronomy & Astrophysics
Ranl A. Briceno, Jozef J. Dudek, Robert G. Edwards, Christian J. Shultz, Christopher E. Thomas, David J. Wilson
Summary: A series of typographical mistakes were found in the equations shown in our published paper. In this erratum, we explain and correct these errors, which do not alter the numerical results presented.
Article
Astronomy & Astrophysics
Toru T. Takahashi, Yoshiko Kanada-En'yo
Summary: By investigating the color correlation between static quarks and antiquarks using entanglement entropy, it was found that the color correlation among quarks quickly disappears above the phase transition temperature. The study also looked at the color screening effect via the screening mass and discussed differences in screening properties between small and large distance regions between quarks.
Article
Physics, Nuclear
S. Chagdaa, B. Purev, E. Galsandorj
Summary: Investigated the chromoelectric and chromomagnetic field and energy density distributions produced by a quark-antiquark pair in the presence of dynamical fermions near the deconfinement phase transition. Found that dynamical fermions widen the flux tube in a short separation range before hadronization occurs. The flux tube structure persists in the deconfined phase and gradually melts after reaching a certain temperature above the critical temperature.
JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS
(2021)
Article
Physics, Particles & Fields
D. Banerjee, S. Datta, M. Laine
Summary: This study investigates the Brownian motion of heavy quarks in a hot QCD medium and the corresponding transport coefficients. By expanding the transport coefficients of heavy quarks and considering the color-electric and color-magnetic effects, the spectral function is calculated.
JOURNAL OF HIGH ENERGY PHYSICS
(2022)
Article
Physics, Particles & Fields
Marco Ce, Tim Harris, Harvey B. Meyer, Arianna Toniato
Summary: The article interprets the structure functions of a thermal medium in terms of electron scattering and exchange of spacelike photons, focusing on deep-inelastic scattering and moment sum rules obeyed by the structure functions. It discusses the thermal expectation value of twist-two operators computable in lattice QCD, as well as how lattice QCD calculations can probe the virtuality required for Bjorken scaling. Moreover, it provides a parton-model interpretation of structure functions in the Bjorken limit and tests its consistency.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Astronomy & Astrophysics
Mattia Dalla Brida, Leonardo Giusti, Tim Harris, Michele Pepe
Summary: This study aims to solve the precise determination of the Hadronic contribution to the muon anomalous magnetic moment through multi-level Monte Carlo integration, reducing the variance of correlators to accelerate the simulation cost.
Article
Astronomy & Astrophysics
P. A. Boyle, F. Erben, J. M. Flynn, V. Gulpers, R. C. Hill, R. Hodgson, A. Juttner, F. O. Hogain, A. Portelli, C. T. Sachrajda
Summary: We perform the first calculation of the electromagnetic form factor V(z) for the long-distance contributions to the K+ -> pi+e+e- decay amplitude using physical light-quark masses. The calculation is done on a 2 + 1 flavor domain wall fermion ensemble with a lattice spacing of a-1 = 1.730(4) GeV. We implement a Glashow-Iliopoulos-Maiani cancellation by extrapolating to the physical charm-quark mass from three masses below charm. We obtain a value of V(z = 0.013(2)) = -0.87(4.44), providing a bound for its magnitude. The large statistical error is due to the stochastically estimated quark loops.
Article
Astronomy & Astrophysics
Ying-Ying Li, Xing-Lin Liu, Xin-Yi Liu, Zhen Fang
Summary: This article introduces an improved soft-wall AdS/QCD model coupled to an Einstein-dilaton system, which offers the ability to study deconfining and chiral transitions simultaneously. The correlation between these transitions is investigated, and the effects of the scaling dimension of the dual operator of the dilaton on chiral transitions are observed.
Article
Physics, Particles & Fields
Kirill Boguslavski, Babak S. Kasmaei, Michael Strickland
Summary: In this study, the imaginary part of the heavy-quark potential was extracted using classical-statistical simulations, with comparisons made to continuum expressions and lattice perturbation theory calculations. The results showed little sensitivity to lattice spacing at small values of a certain variable, and quantified non-perturbative long-range corrections for large quark-antiquark separations. This work laid the groundwork for extracting the imaginary part of the heavy-quark potential in expanding non-equilibrium Yang-Mills plasma.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Jochen Heitger, Fabian Joswig, Simon Kuberski
Summary: The determination of charm quark mass in lattice QCD with three active quark flavours is presented in this study. The renormalisation group invariant charm quark mass at the physical point of the three-flavour theory is found to be approximately 1486 MeV. Combining with five-loop perturbation theory, the renormalisation group invariant charm quark mass in the four-flavour theory is calculated to be 1548 MeV. In the MS scheme, the renormalised charm quark mass is reported to be 1296 MeV and 1007 MeV at conventional energy scales in phenomenology.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Multidisciplinary
Alfred Stadler, Sofia Leitao, M. T. Pena, Elmar P. Biernat
Article
Physics, Multidisciplinary
G. Ramalho
Article
Physics, Nuclear
G. Ramalho
EUROPEAN PHYSICAL JOURNAL A
(2019)
Article
Instruments & Instrumentation
Nicolo Tuccori, Teresa Pinheiro, Teresa Pena, Luis C. Alves, Maria Joao Botelho, Joana Raimundo, Carlos Vale
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS
(2019)
Article
Astronomy & Astrophysics
G. Ramalho
Summary: Complete calculations of the electromagnetic form factors of the Omega(-) have been presented in both spacelike and timelike regions. The analyses are conducted within the covariant spectator quark model, and the results are compared with lattice QCD data and experimental data from CLEO. The impact of large-Q(2) correlations and possible solutions are also examined.
Article
Astronomy & Astrophysics
G. Ramalho
Article
Astronomy & Astrophysics
G. Ramalho, M. T. Pena
Article
Astronomy & Astrophysics
G. Ramalho, M. T. Pena, K. Tsushima
Article
Astronomy & Astrophysics
G. Ramalho
Article
Astronomy & Astrophysics
Gernot Eichmann, Pedro Duarte, M. T. Pena, Alfred Stadler
Article
Astronomy & Astrophysics
G. Ramalho, J. P. B. C. de Melo, K. Tsushima
Article
Astronomy & Astrophysics
Elmar P. Biernat, Franz Gross, M. T. Pena, Alfred Stadler, Sofia Leitao
Article
Astronomy & Astrophysics
Gernot Eichmann, G. Ramalho