Article
Physics, Particles & Fields
Pei-Lin Yin, Zhu-Fang Cui, Craig D. Roberts, Jorge Segovia
Summary: The research uses a symmetry-preserving treatment to compute spectra of mesons and baryons, reproducing known masses with high accuracy. It indicates the importance of dynamic, nonpointlike diquark correlations in baryons, with the lightest allowed diquark being the most important component of a baryon's Faddeev amplitude.
EUROPEAN PHYSICAL JOURNAL C
(2021)
Article
Astronomy & Astrophysics
Z. R. Kordov, R. Horsley, W. Kamleh, Z. Koumi, Y. Nakamura, H. Perlt, P. E. L. Rakow, G. Schierholz, H. Stueben, R. D. Young, J. M. Zanotti
Summary: This study analyzed the light pseudoscalar mesons on a lattice, taking into account the mixing between pi degrees, eta, and eta'. The researchers extracted the masses and flavor compositions of the pseudoscalar meson nonet in a lattice QCD + QED setting around an SU(3)-flavor symmetric point, and observed flavor-symmetry features in the data. One key finding was the observed mass splitting between pi degrees and eta, showing a simple relationship with their corresponding flavor compositions.
Article
Astronomy & Astrophysics
Yan Lyu, Hui Tong, Takuya Sugiura, Sinya Aoki, Takumi Doi, Tetsuo Hatsuda, Jie Meng, Takaya Miyamoto
Summary: Optimized interpolating operators are constructed using the HAL QCD method, which are dominantly coupled to each eigenstate of two baryons. The validity of these operators is tested by considering heavy dibaryons??3Q??3Q (Q = s, c) calculated by (2 + 1)-flavor lattice QCD simulations. The results show that the optimized operators provide effective energies of the ground and excited states and can reliably extract the potential V(r).
Article
Physics, Nuclear
Yong-Jiang Xu, Yong-Lu Liu, Ming-Qiu Huang
Summary: In this study, the masses and pole residues of P-wave Omega(b) states represented by interpolating currents with a derivative are calculated using the QCD sum rule method. The uncertainties in the calculation are large compared to the small difference in the masses of the excited Omega(b) states observed by the LHCb collaboration, thus further investigation is necessary to understand other properties of the P-wave Omega(b) states represented by the interpolating currents studied in this work.
Article
Astronomy & Astrophysics
C. Alexandrou, S. Bacchio, G. Bergner, M. Constantinou, M. Di Carlo, P. Dimopoulos, J. Finkenrath, E. Fiorenza, R. Frezzotti, M. Garofalo, K. Hadjiyiannakou, B. Kostrzewa, G. Koutsou, K. Jansen, V Lubicz, M. Mangin-Brinet, F. Manigrasso, G. Martinelli, E. Papadiofantous, F. Pittler, G. C. Rossi, F. Sanfilippo, S. Simula, C. Tarantino, A. Todaro, C. Urbach, U. Wenger
Summary: In this study, a calculation of the up, down, strange, and charm quark masses was conducted within the lattice QCD framework using twisted-mass fermion action. Scale setting with various quantities was used to check for finite lattice spacing effects, confirming compatible results in the continuum limit. Nonperturbative quark mass renormalization was performed using the RI'-MOM method, with determination of quark masses based on physical observables from the meson and baryon sectors.
Article
Astronomy & Astrophysics
Juhi Oudichhya, Keval Gandhi, Ajay Kumar Rai
Summary: The study calculates the masses of ground and excited states of Omega(0)(c), Omega(+)(cc) and Omega c(cc)(*)(++) baryons within the framework of Regge phenomenology, attempting to assign a possible spin-parity to these obtained masses. The calculated masses are in agreement with experimental observations and close to other theoretical predictions, providing useful information for future experimental searches and spin-parity assignments of these states. By fixing the slope and intercept of each Regge line, the study also estimates the masses of higher excited states of these baryons.
Article
Astronomy & Astrophysics
M. Hippert, E. S. Fraga, J. Noronha
Summary: In this study, we investigate the minimal physical requirements for generating a speed of sound that surpasses its asymptotic conformal limit, showing that a peak in the speed of sound emerges naturally in homogeneous matter during the transition from a phase with broken chiral symmetry to one with a gapped Fermi surface. A minimal model based on the spontaneous breakdown of an approximate particle-antiparticle symmetry is presented, and its thermodynamic properties are determined.
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
Mattia Dalla Brida, Leonardo Giusti, Tim Harris, Davide Laudicina, Michele Pepe
Summary: This study presents a strategy based on the step-scaling technique to nonperturbatively study thermal QCD up to very high temperatures, specifically focusing on computing flavour non-singlet meson screening masses in a theory with three massless quarks. Chiral symmetry restoration is observed in the results, with deviations in meson screening masses not explained by the known leading term in the QCD coupling constant g. The research findings provide insight into the difficulties in matching non-perturbative lattice results at lower temperatures with the behavior at asymptotically high temperatures.
JOURNAL OF HIGH ENERGY PHYSICS
(2022)
Review
Multidisciplinary Sciences
Victor V. Braguta
Summary: This review discusses the modern understanding of the two-color QCD phase diagram at finite baryon density and low temperatures. At low baryon density, chiral perturbation theory (ChPT) is applicable and predicts a second-order phase transition with Bose-Einstein condensation of diquarks. At larger baryon chemical potentials, interactions between baryons become important and ChPT is not applicable. Lattice studies support most of the theoretical predictions, showing a Fermi sphere composed of quarks and condensation of diquarks on its surface at large baryon densities.
Article
Astronomy & Astrophysics
Hsiang-nan Li
Summary: An inverse matrix method is developed to solve resonance masses from a dispersion relation obeyed by a correlation function. The nonperturbative spectral density obtained exhibits resonance structures naturally. The analysis reveals characteristics of different glueballs and proposes a mixing framework including gluonium components for certain mesons.
Article
Astronomy & Astrophysics
Xiang Gao, Andrew D. Hanlon, Nikhil Karthik, Swagato Mukherjee, Peter Petreczky, Philipp Scior, Shuzhe Shi, Sergey Syritsyn, Yong Zhao, Kai Zhou
Summary: In this study, lattice QCD calculations were performed to determine the valence parton distribution function of the pion, using next-to-next-leading-order perturbative QCD matching. The results are in good agreement with global fits to experimental data.
Article
Physics, Multidisciplinary
Hao-Ze Tong, Hao-Song Li
Summary: In this study, the masses of the doubly bottom baryons and charmed-bottom baryons are investigated up to O(p(3)) in heavy baryon chiral perturbation theory. The unknown low energy constants in the quark model and lattice QCD are determined. The numerical results for the masses of these baryons are presented up to O(p(3)).
COMMUNICATIONS IN THEORETICAL PHYSICS
(2022)
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
Andrew W. Jackura, Raul A. Briceno, Sebastian M. Dawid, Md Habib E. Islam, Connor McCarty
Summary: This study presents a simple scheme for solving relativistic integral equations for three-body amplitudes, exploring different solving strategies and discussing ways of incorporating bound-state pole contribution in the integral equations. The methods presented allow for determination of amplitudes above the three-body threshold and further the objective for directly extracting three-hadron scattering amplitudes from lattice QCD.
