Article
Astronomy & Astrophysics
A. Gomez Nicola, A. Vioque-Rodriguez
Summary: This study revisits chiral perturbation theory at nonzero isospin chemical potential and discusses the effects of new terms and corrections on the free energy density and related observables. The results are consistent with lattice results and support nonzero values for certain low-energy constants. Additionally, an additional constraint is found to preserve a physical condition.
Article
Physics, Particles & Fields
Luke Gayer, Nicolas Lang, Sinead M. Ryan, David Tims, Christopher E. Thomas, David J. Wilson
Summary: The scattering amplitudes of isospin-1/2 D pi are computed using lattice QCD, revealing a D-0* resonance pole strongly coupled to the S-wave D pi channel. This resonant state has a mass of approximately 2200 MeV and a width of around 400 MeV, consistently found below the mass of the D-s0*.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Astronomy & Astrophysics
Martin Napetschnig, Reinhard Alkofer, Markus Q. Huber, Jan M. Pawlowski
Summary: By utilizing Nielsen identities and Landau gauge propagators as the starting point, we calculate gluon and ghost propagators in Yang-Mills theory, showing that our results are quantitatively reliable for gauge parameter values xi <= 1/2. The correlation functions, especially the ghost propagator, significantly change with increasing gauge parameter, while the ghost-gluon running coupling and the position of the zero crossing of the Schwinger function of the gluon propagator remain unchanged within uncertainties.
Article
Physics, Nuclear
Zhouyou Fan, Rui Zhang, Huey-Wen Lin
Summary: In this study, the first lattice-QCD results were presented to access the x-dependence of the gluon unpolarized PDF of the nucleon. The results show that the fitted gluon PDFs at both pion masses are consistent with global fits in the x > 0.3 region.
INTERNATIONAL JOURNAL OF MODERN PHYSICS A
(2021)
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
A. Turkan, G. Bozkir, K. Azizi
Summary: In the framework of the thermal QCD sum rule, the mass and residue of single heavy spin-1/2 Lambda(Q), Sigma(Q), Xi((Q)'()), and Omega(Q) baryons are studied at finite temperature. The results show stable mass and residue up to certain temperatures, followed by a decrease as temperature increases. Significant changes in mass and residue for bottom and charm channels indicate melting of baryons near the pseudocritical temperature.
Article
Physics, Nuclear
Shu-Sheng Xu
Summary: The study investigates the pion superfluidity phase transition at T - mu(I) and mu(q) - mu(I) planes using Dyson-Schwinger equations, showing that the pion condensate remains zero under certain conditions and is in agreement with lattice QCD results. Additionally, the pion superfluid phase appears in specific regions at low temperature and high isofin chemical potential.
EUROPEAN PHYSICAL JOURNAL A
(2021)
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.
Article
Physics, Nuclear
A. De, J. Kapusta, M. Singh, T. Welle
Summary: In this study, hydrodynamic modeling was conducted to simulate Au-Au collisions from root s(NN) = 7.7 to 200 GeV. The simulations incorporated three innovative components, including the LEXUS-inspired Monte Carlo initial-state model, a crossover equation of state without a critical point, and departure functions derived from the quasiparticle theory of transport coefficients.
Article
Physics, Particles & Fields
Prabal Adhikari, Jens O. Andersen, Martin A. Mojahed
Summary: We studied two-flavor chiral perturbation theory at finite isospin chemical potential and finite temperature, finding that the transition to the pion-condensed phase is second order within the theory's validity range, and calculated the pressure in the symmetric phase.
EUROPEAN PHYSICAL JOURNAL C
(2021)
Article
Astronomy & Astrophysics
C. Alexandrou, S. Bacchio, G. Bergner, P. Dimopoulos, J. Finkenrath, R. Frezzotti, M. Garofalo, B. Kostrzewa, G. Koutsou, P. Labus, F. Sanfilippo, S. Simula, M. Ueding, C. Urbach, U. Wenger
Summary: This study presents a determination of the ratio of kaon and pion leptonic decay constants in isosymmetric QCD (ISOQCD), obtaining a result of 1.1995, and discusses the implications for the Cabibbo-Kobayashi-Maskawa matrix element |V-us| and for the first-row Cabibbo-Kobayashi-Maskawa unitarity.
Article
Astronomy & Astrophysics
Yui Hayashi, Kei-Ichi Kondo
Summary: This paper investigates formal aspects of propagators with complex singularities in reconstructing Minkowski propagators, finding that these propagators violate reflection positivity and positivity condition while maintaining Lorentz symmetry and locality. The results suggest that complex singularities can be related to confined states and may offer a new way of understanding confinement mechanisms, particularly in the Landau-gauge Yang-Mills theory.
Article
Astronomy & Astrophysics
F. Pinto-Gomez, F. De Soto, M. N. Ferreira, J. Papavassiliou, J. Rodriguez-Quintero
Summary: We present new results for the three-gluon vertex obtained from a large-scale lattice simulation in the Landau gauge. The simulation evaluates the transversely projected vertex using a special tensorial basis, with form factors parametrized in terms of Bose-symmetric variables. Interestingly, the form factors primarily depend on a single kinematic variable, the sum of the squares of the three incoming four-momenta. This property, known as planar degeneracy, allows for a simplified and compact description of the data, suitable for future numerical applications. Confirming this property through a detailed study of specific configurations, we find that a semi-perturbative analysis accurately reproduces the lattice findings when a gluon mass is included to eliminate spurious divergences. (c) 2023 Published by Elsevier B.V. This is an open access article under the CC BY license (http:// creativecommons .org /licenses /by /4 .0/). Funded by SCOAP3.
Article
Astronomy & Astrophysics
A. C. Aguilar, F. De Soto, M. N. Ferreira, J. Papavassiliou, J. Rodriguez-Quintero
Summary: This study presents novel lattice results for the form factors of the quenched three-gluon vertex of QCD, exploring their distinct infrared behaviors in different kinematic configurations. The findings are thoroughly analyzed within the Schwinger-Dyson framework, supported by special relations obtained from the Slavnov-Taylor identities of the theory. The lattice results confirm the emerging picture of the underlying dynamics both qualitatively and quantitatively.
Article
Physics, Particles & Fields
Alexander Lehmann, Alexander Rothkopf
Summary: The paper computes the real-time interaction potential between a static quark and antiquark in classical lattice gauge theory at finite temperature and determines the screened real part of this potential while confirming the presence of an imaginary part. The real part is closely related to the back-reaction of static sources onto the gauge fields, which is incorporated via Gauss's law. Differences in the treatment of static sources in quantum and classical lattice gauge theory are also discussed.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Nuclear
V. G. Bornyakov, V. V. Bryzgalov, V. K. Mitrjushkin, R. N. Rogalyov
INTERNATIONAL JOURNAL OF MODERN PHYSICS A
(2018)
Article
Physics, Nuclear
V. G. Bornyakov, R. N. Rogalyov
Summary: The study investigates longitudinal and transverse gluon propagators in Landau gauge lattice QCD with SU(2) gauge group at varying temperature and quark density. It is observed that the longitudinal propagator decreases with increasing quark chemical potential at all temperatures, while the transverse propagator increases at low temperatures (<200 MeV) and remains constant at higher temperatures. The relative strength of chromoelectric and chromomagnetic interactions is also discussed in the study.
INTERNATIONAL JOURNAL OF MODERN PHYSICS A
(2021)
Article
Physics, Particles & Fields
A. Begun, V. G. Bornyakov, N. Gerasimeniuk, R. N. Rogalyov, V. A. Goy
Summary: In this study, we simulated the lattice QC(2)D system with N-f = 2 staggered fermionic action at imaginary and real quark chemical potential above the critical temperature. By applying various methods for analytic continuation of the quark number density based on numerical results at imaginary mu(q), we determined the most effective approach by comparing with the results at real mu(q). This method is believed to be applicable to lattice QCD data.
PHYSICS OF PARTICLES AND NUCLEI
(2021)
Article
Physics, Particles & Fields
R. N. Rogalev, V. G. Bornyakov, N. V. Gerasimeniuk, V. A. Goy, A. A. Korneev, A. V. Molochkov, A. Nakamura
Summary: The thermodynamic properties of dense and hot strongly interacting matter were studied in the lattice regularization of QCD using the Lee-Yang approach. It was found that at high temperatures, the Lee-Yang zeros in the complex plane of baryon fugacity lie on the negative real semiaxis, indicating the Roberge-Weiss transition. The baryon density and pressure exhibit a gap on the line of Lee-Yang zeros, with the baryon density jump being proportional to the density of Lee-Yang zeros. Two methods for calculating baryon number distributions were explored, showing that the asymptotic estimate method only gives positive state probabilities for a specific baryon number, unlike numerical integration. The importance of experimental measurements of these probabilities in studying thermodynamic equilibrium in nuclear-nuclear collisions is discussed.
PHYSICS OF PARTICLES AND NUCLEI LETTERS
(2023)
Article
Astronomy & Astrophysics
Nikolai Gerasimeniuk, Vitaly Bornyakov, Vladimir Goy, Roman Rogalyov, Anatolii Korneev, Alexander Molochkov, Atsushi Nakamura
Summary: We compute the canonical partition functions and the Lee-Yang zeros in Nf=2 lattice QCD above the Roberge-Weiss phase transition temperature. The phase transition is characterized by the discontinuities in the baryon number density at specific values of imaginary baryon chemical potential. We further develop our method to compute the canonical partition functions using the asymptotic expression for respective integral, and study the behavior of the Lee-Yang zeros in the limit of high baryon density.
Article
Astronomy & Astrophysics
Roman Rogalyov, Vladimir Goy
Summary: In this study, we use lattice simulations to construct the equation of state for dense and hot strong-interacting matter. We also discuss the implications of the asymptotic behavior of probability distributions for the problem of reconstructing net-baryon probability distributions.
Article
Astronomy & Astrophysics
V. G. Bornyakov, N. V. Gerasimeniuk, V. A. Goy, A. A. Korneev, A. V. Molochkov, A. Nakamura, R. N. Rogalyov
Summary: We numerically study the Roberge-Weiss phase transition, which is characterized by discontinuities in the quark-number density at specific values of imaginary quark chemical potential. We use a polynomial fit function to parametrize the quark-number density and compute the canonical partition functions. Our approach proves to be a good framework for analyzing lattice QCD data at finite density and high temperature. We show numerically that the Lee-Yang zeros lie on the negative real semiaxis at high temperature when taking into account the contributions from high-quark-number to the grand canonical partition function. These Lee-Yang zeros have nonzero linear density, indicating the Roberge-Weiss phase transition. We demonstrate that this density agrees with the discontinuity in quark-number density at the transition line.
Article
Astronomy & Astrophysics
A. Begun, V. G. Bornyakov, V. A. Goy, A. Nakamura, R. N. Rogalyov
Summary: This study focuses on the confinement-deconfinement transition in two colors lattice QCD with staggered fermions, calculating the string tension and static quark free energy. The deconfinement transition is found to shift to higher values at higher quark chemical potential due to decreased lattice spacing used in simulations.
Article
Astronomy & Astrophysics
V. G. Bornyakov, I Kudrov, R. N. Rogalyov
Summary: We study the approximation of static potentials in different representations by decomposing the SU(2) gauge field into monopole and monopoleless components. The results indicate that the approximation becomes more accurate in different representations and lattice spacings, and it becomes exact in the continuum limit.
Article
Astronomy & Astrophysics
V. G. Bornyakov, V. A. Goy, V. K. Mitrjushkin, R. N. Rogalyov
Summary: This study investigates the chromoelectric-chromomagnetic asymmetry of the A(2) gluon condensate and the infrared behavior of gluon propagators at T≈T-c in the Landau-gauge SU(3) lattice gauge theory. Significant correlations between the real part of the Polyakov loop, the asymmetry, and the longitudinal propagator are found, enabling the determination of critical behavior. Screening masses in different Polyakov-loop sectors are obtained, and the dependence of chromoelectric and chromomagnetic interactions on the choice of Polyakov-loop sector in the deconfinement phase is discussed.
Article
Astronomy & Astrophysics
V. G. Bornyakov, V. V. Braguta, A. A. Nikolaev, R. N. Rogalyov
Article
Astronomy & Astrophysics
Vitaly Bornyakov, Andrey Kotov, Aleksandr Nikolaev, Roman Rogalyov
Article
Astronomy & Astrophysics
V. G. Bornyakov, V. K. Mitrjushkin, R. N. Rogalyov
Proceedings Paper
Physics, Particles & Fields
V. G. Bornyakov, V. K. Mitrjushkin, R. N. Rogalyov
PROCEEDINGS OF THE XXXI INTERNATIONAL WORKSHOP ON HIGH ENERGY PHYSICS: CRITICAL POINTS IN THE MODERN PARTICLE PHYSICS
(2018)
