Article
Physics, Multidisciplinary
Constantia Alexandrou, Simone Bacchio, Georg Bergner, Jacob Finkenrath, Andrew Gasbarro, Kyriakos Hadjiyiannakou, Karl Jansen, Bartosz Kostrzewa, Konstantin Ottnad, Marcus Petschlies, Ferenc Pittler, Fernanda Steffens, Carsten Urbach, Urs Wenger
Summary: This study presents the first full decomposition of the pion momentum into its gluon and quark contributions. The results show that the sum of separate contributions satisfies the momentum sum rule.
PHYSICAL REVIEW LETTERS
(2021)
Article
Astronomy & Astrophysics
Siddharth Jain, R. Aggarwal, M. Kaur
Summary: Predictions are made for the jet substructure of one-jet events produced in positron-proton neutral current deep inelastic scattering at the future Electron-Ion Collider. Data are simulated using Monte Carlo event generators and jets and subjets are produced by a cluster algorithm. The subjet multiplicity distributions and differential jet shapes are measured for different jet sizes and varying jet-resolution parameter, with a comparison between different cluster algorithms.
Article
Materials Science, Multidisciplinary
Atsuo Shitade, Yasufumi Araki
Summary: The axial magnetic effect (AME) is an anomalous transport phenomenon induced by an axial magnetic field. Numerical studies on the relativistic Wilson fermion in the axial magnetic field and a twisted Dirac semimetal have shown non-zero AME current density inside the bulk. However, the average AME current density vanishes in both models due to surface contributions. The AME is attributed to magnetization energy current and cannot be observed in transport experiments.
Article
Astronomy & Astrophysics
Andrei Alexandru, Ivan Horvath
Summary: This article proposes a thermal QCD phase change based on an analogy with the metal-to-insulator transition. It argues that a high-temperature state in QCD is not an insulator, but a critical state with a new singular mobility edge. The authors provide evidence using pure-glue QCD to support the presence of deeply infrared Dirac modes in the infrared phase that can extend to arbitrarily long distances. They emphasize the role of gauge field topology and disorder in shaping the infrared physics.
Article
Astronomy & Astrophysics
Jan Horak, Joannis Papavassiliou, Jan M. Pawlowski, Nicolas Wink
Summary: The ghost spectral function in Yang-Mills theory is computed by solving the corresponding Dyson-Schwinger equation using a given input gluon spectral function. The results show a particle peak at vanishing momentum and a negative scattering spectrum, with analytically obtained infrared and ultraviolet tails. The ghost dressing function is calculated across the entire complex plane, and its key features are identified and discussed.
Article
Astronomy & Astrophysics
Giorgio Comitini, Daniele Rizzo, Massimiliano Battello, Fabio Siringo
Summary: This study investigates the infrared behavior of the quark propagator at one loop in the Landau gauge using three different quark self-energy resummation schemes and the screened massive expansion. By shifting the expansion point of perturbation theory and applying nonstandard renormalization of the bare parameters, the dynamical generation of an infrared quark mass in the chiral limit is successfully described. The scale for the mass is determined by a mass parameter M, fixed by fitting lattice data for quenched QCD, showing good agreement with the lattice results for the quark mass function M(p(2)). However, the quark Z function exhibits incorrect qualitative behavior in most resummation schemes, with only one scheme showing qualitatively correct behavior at high energies.
Article
Astronomy & Astrophysics
Swarnapratim Bhattacharyya, Elena Firu, Alina Tania Neagu
Summary: A new study on forward-backward multiplicity fluctuation of pions in a nuclear emulsion detector has been conducted using the method of strongly intensive quantity EFB for 16O-AgBr, 28Si-AgBr, and 32S-AgBr interactions at 4.5 AGeV/c. Experimental analysis was compared to MCRAND events and UrQMD simulated events, with the UrQMD model failing to reproduce the experimental results. The analysis shows the presence of dynamical fluctuations in multiparticle production at 4.5 AGeV/c and larger fluctuations at lower energy compared to higher energy data studied thus far.
Article
Astronomy & Astrophysics
Shirley Weishi Li, Peter Lowdon, Orlando Oliveira, Paulo J. Silva
Summary: The existence of BRST symmetry in non-perturbative QCD imposes constraints on the ghost and gluon spectra, but this interconnection is violated in actual data, indicating that continuum and current lattice formulations in Landau gauge represent two distinct realisations of Yang-Mills theory.
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
Physics, Multidisciplinary
Min He, Ralf Rapp
Summary: The hadrochemistry of bottom quarks produced in hadronic collisions can provide valuable information on color neutralization mechanism. By employing a statistical hadronization approach, including additional b-hadron states based on the relativistic quark model and lattice-QCD computations, and assuming relative chemical equilibrium, a fair description of the transverse momentum distribution and particle ratios in pp collisions can be obtained.
PHYSICAL REVIEW LETTERS
(2023)
Article
Astronomy & Astrophysics
Jian-Rong Zhang
Summary: This study utilizes the QCD sum rule approach to numerically calculate the masses of novel fully heavy QQQQ (Q) over bar pentaquark states, resulting in values of 7.41(-0.3)(1)(+0.27) GeV for cccc (c) over bar and 21.6012 GeV for bbbb (b) over bar. These predicted all-heavy pentaquark states can be searched for in the Omega(QQQ eta Q) invariant mass spectrum in experiments.
Article
Astronomy & Astrophysics
Bruno El-Bennich, German Ramos-Zambrano, Eduardo Rojas
Summary: The research proposes a model for the massive gluon propagator that accurately reproduces mass and weak decay constants of pi, K, and eta(c) in excellent agreement with experimental values, while reasonably describing D and D-s. The simplicity of this effective interaction has the potential for useful phenomenological applications and calculations in Minkowski space.
Article
Astronomy & Astrophysics
Fabio Siringo, Giorgio Comitini
Summary: One-loop explicit expressions for the gluon Nielsen identity in the screened massive expansion formalism for Yang-Mills theory are derived. The gauge-parameter-independence of the poles and residues is discussed in both a strict perturbative context and extended resummation schemes. Although no exact formal proof was reached by the approximate resummation schemes, some evidence is gathered in favor of an exact invariance of the phase, consistent with previous numerical studies.
Article
Astronomy & Astrophysics
Yui Hayashi, Kei-Ichi Kondo
Summary: Complex singularities have been found in propagators of confined particles, and Minkowski propagators are rigorously reconstructed from Euclidean propagators with complex singularities. The analytically continued Wightman function remains holomorphic in the tube, maintaining Lorentz symmetry and locality, while the reconstructed Wightman function violates temperedness and positivity conditions. Additionally, it is argued that complex singularities correspond to confined zero-norm states in an indefinite metric state space.
Article
Physics, Particles & Fields
Shuai Y. F. Liu, Yi Yin
Summary: The study systematically analyzes the effects of derivatives of hydrodynamic fields on the axial Wigner function describing spin polarization vector in phase space. By considering all possible first-order derivative contributions allowed by symmetry and using linear response theory, the study identifies potentially significant contributions, especially the quadrupole induction for spin polarization due to shear strength. The results, together with hydrodynamic gradients from simulations, provide a basis for interpreting spin polarization measurements in heavy-ion collisions.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Multidisciplinary
Lukas Rammelmueller, Joaquin E. Drut, Jens Braun
Article
Physics, Multidisciplinary
M. Leonhardt, M. Pospiech, B. Schallmo, J. Braun, C. Drischler, K. Hebeler, A. Schwenk
PHYSICAL REVIEW LETTERS
(2020)
Review
Physics, Multidisciplinary
C. E. Berger, L. Rammelmueller, A. C. Loheac, F. Ehmann, J. Braun, J. E. Drut
Summary: This paper reviews the theory and applications of complex stochastic quantization in the quantum many-body problem, covering various methods to address the sign problem. It discusses the mathematical foundations, provides pedagogical examples, and summarizes the challenges and practical solutions in the complex case. Additionally, recent applications of complex Langevin to quantum field theory are reviewed, with a focus on the nonrelativistic case.
PHYSICS REPORTS-REVIEW SECTION OF PHYSICS LETTERS
(2021)
Article
Astronomy & Astrophysics
Jens Braun, Benedikt Schallmo
Summary: This study estimates the phase structure at zero temperature of dense isospin-asymmetric matter with two quark flavors using constraints from the microscopic theory of the strong interaction. It finds indications of a first-order phase transition from a color-superconducting phase to an ungapped quark-matter phase as the density increases, with this transition absent in isospin-symmetric matter. The study also provides an estimate for the speed of sound in neutron-star matter, which exceeds the asymptotic value associated with noninteracting quark gas and increases toward lower densities.
Article
Astronomy & Astrophysics
Adrian Koenigstein, Martin J. Steil, Nicolas Wink, Eduardo Grossi, Jens Braun
Summary: By reformulating the renormalization group flow equations as nonlinear heat equations, this study demonstrates the implications of dissipative character and irreversibility in RG flows. The existence of a C-/A-function is proposed to be linked to the dissipative character of RG flows and entropy production. The asymmetry in RG time and the interpretation of infrared actions as equilibrium solutions are discussed. Numerical entropy production is directly linked to irreversibility and the analysis of partial differential equations (PDEs).
Article
Astronomy & Astrophysics
Adrian Koenigstein, Martin J. Steil, Nicolas Wink, Eduardo Grossi, Jens Braun, Michael Buballa, Dirk H. Rischke
Summary: The functional renormalization group (FRG) approach is a powerful tool used in various fields to study different systems. This study introduces a novel method to solve flow equations using the analogy between RG equations and fluid dynamics. By applying this analogy to zero-dimensional quantum-field theoretical models, insights into RG flows and their interpretation, as well as the irreversibility of RG flows, can be gained. Additionally, numerical techniques developed in fluid dynamics can be applied to solve RG equations, allowing for the treatment of nonanalytic behavior in the RG flow.
Article
Optics
Felipe Attanasio, Lukas Rammelmueller, Joaquin E. Drut, Jens Braun
Summary: We nonperturbatively study the pairing behavior in high-temperature polarized two-component Fermi gases and analyze the pair-momentum distribution and shot-noise correlations. The results suggest that the dominant pairing patterns above the superfluid transition also govern the formation of condensates in the low-temperature regime.
Article
Astronomy & Astrophysics
Jens Braun, Benedikt Schallmo
Summary: We study the emergence of color superconductivity in high density strong-interaction theory, analyzing the behavior and scaling properties of diquark states and couplings. Our results suggest the existence of a maximum speed of sound at supranuclear densities.
Article
Astronomy & Astrophysics
Jens Braun, Timon Doernfeld, Benedikt Schallmo, Sebastian Toepfel
Summary: The study of dense relativistic matter is complicated and important in understanding its phase structure and thermodynamics. The introduction of regulator functions and discussion of regularization schemes are key components in the research process.
Article
Optics
Lukas Rammelmueller, Yaqi Hou, Joaquin E. Drut, Jens Braun
Summary: We theoretically study the pairing behavior of the unitary Fermi gas in the normal phase, with analysis based on spin susceptibility response to an external magnetic field. Our findings are discussed in context of the phase diagram of the spin-polarized unitary Fermi gas.
Article
Astronomy & Astrophysics
Jens Braun, Wei-jie Fu, Jan M. Pawlowski, Fabian Rennecke, Daniel Rosenblueh, Shi Yin
Article
Astronomy & Astrophysics
Jens Braun, Marc Leonhardt, Martin Pospiech
Article
Physics, Multidisciplinary
Jens Braun, Marc Leonhardt, Jan M. Pawlowski
Proceedings Paper
Physics, Multidisciplinary
Lukas Rammelmueller, Joaquin E. Drut, Jens Braun
19TH INTERNATIONAL CONFERENCE RECENT PROGRESS IN MANY-BODY THEORIES (RPMBT)
(2018)
Article
Astronomy & Astrophysics
Andrew C. Loheac, Jens Braun, Joaquin E. Drut
