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
Oliver Baer, Haris Colic
Summary: The study investigates the contribution of nucleon-pion states to QCD lattice calculations of nucleon electromagnetic form factors using chiral perturbation theory. The results show that the contribution to the electric form factor is around +5% at a source-sink separation of 2 fm, increasing with momentum transfer Q(2). In contrast, the contribution to the magnetic form factor leads to an underestimation of about 5% that decreases with increasing Q(2).
Article
Physics, Multidisciplinary
Martin Bauer, Matthias Neubert, Sophie Renner, Marvin Schnubel, Andrea Thamm
Summary: This study presents a consistent implementation of weak decays involving an axion or axionlike particle in the context of an effective chiral Lagrangian, finding that the K- -> pi(-)a branching ratio is almost 40 times larger than previously estimated.
PHYSICAL REVIEW LETTERS
(2021)
Article
Astronomy & Astrophysics
M. R. Robilotta
Summary: This study explores the application of SU(2) and SU(3) unitary matrices in chiral descriptions, providing analytic representations and revealing their intrinsic relationships and properties through mathematical derivations and symbolic calculations.
Article
Multidisciplinary Sciences
Rui-Xiang Shi, Shuang-Yi Li, Jun-Xu Lu, Li-Sheng Geng
Summary: Weak radiative hyperon decays have long puzzled researchers, but recent work using covariant baryon chiral perturbation theory has successfully described the experimental data from BESIII. The study also predicts the outcomes of future measurements, which will further test our understanding of weak radiative hyperon decays and the perturbation theory.
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
Sourendu Gupta, Jajati K. Nayak, Sushant K. Singh
Summary: Using linear response theory, the thermalization of an ensemble of the octet of pseudoscalar mesons was investigated at a temperature of 150 MeV, with a relaxation time of around 100 fm and rapid increase with temperature. The long relaxation times are directly linked to the fact that these mesons are pseudo-Goldstone bosons of chiral symmetry breaking.
Article
Astronomy & Astrophysics
Daiki Suenaga, Atsushi Hosaka
Summary: In this study, a chiral model is presented to describe the decays of Roper-like heavy baryons and light baryons. The axial charges of the heavy baryons are derived based on the chiral model and heavy quark spin symmetry, which control the magnitude of their pion or kaon decays. The study also shows that reasonable values of the axial charges can explain the large decay widths of certain heavy baryons that cannot be explained by conventional nonrelativistic quark models. In addition, the chiral model is applied to predict the decay widths of an undiscovered heavy baryon.
Article
Astronomy & Astrophysics
Giorgio Silvi, Srijit Paul, Constantia Alexandrou, Stefan Krieg, Luka Leskovec, Stefan Meinel, John Negele, Marcus Petschlies, Andrew Pochinsky, Gumaro Rendon, Sergey Syritsyn, Antonino Todaro
Summary: This study determines the Delta(1232) resonance parameters using lattice QCD and the Luscher method. The resonance is found to have a mass of 1378(7)(9) MeV and a coupling g(Delta-pi N) of 23.8(2.7)(0.9) with the pion-nucleon system.
Article
Astronomy & Astrophysics
Henrique Rubira, Rodrigo Voivodic
Summary: A logarithm transformation of the matter overdensity field allows information from higher-order functions to be transferred to the power spectrum, improving computational efficiency and accuracy. Studies show that the large-scale behavior of the log-transformed field can be represented by a small number of free parameters, and the non-linear transformation enables access to information on smaller scales.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2021)
Article
Astronomy & Astrophysics
A. Feijoo, V. Valcarce Cadenas, V. K. Magas
Summary: We have used extended Unitarized Chiral Perturbation Theory to study the meson-baryon interaction in the neutral S = -2 sector. Our approach incorporates not only the leading Weinberg-Tomozawa term, as in previous studies, but also the Born terms and next-to-leading order contribution. By employing the SU(3) symmetry of the chiral Lagrangian, we have taken most of the model parameters from the BCN model and fit them to experimental data in the neutral S = -1 sector. Our results demonstrate the ability of our approach to dynamically generate Xi(1620) and Xi(1690) states in reasonable agreement with the data, and provide a natural explanation for the puzzle with the decay branching ratios of Xi(1690). This highlights the reliability of chiral models with unitarization in coupled channels and the importance of considering Born and NLO contributions for precise calculations.
Article
Astronomy & Astrophysics
G. Buchalla, O. Cata, A. Celis, M. Knecht, C. Krause
Summary: This study systematically calculates the renormalization process of the Higgs-electroweak chiral Lagrangian, including the renormalization of the lowest-order Lagrangian and the decomposition of the remaining divergences into a next-to-leading-order counterterm basis. The results are shown to match the one-loop renormalization of dimension-6 operators in SMELT, with differences from related literature works being highlighted and discussed. Additionally, the study evaluates the one-loop divergences of the vacuum expectation value of the Higgs field and determines the finite renormalization required to maintain the no-tadpole condition on the Higgs field.
Article
Astronomy & Astrophysics
P. M. Copeland, Chueng-Ryong Ji, W. Melnitchouk
Summary: The study computes the self-energies of flavor SU(3) octet and decuplet baryons within a relativistic chiral effective theory framework, deriving the leading nonanalytic chiral behavior for the masses. A finite-range regularization consistent with Lorentz and gauge invariance is applied, and the relative importance of various meson-baryon loop contributions to the self-energies is numerically studied. A comparison is made between relativistic results and earlier approximations within the heavy baryon limit.
Article
Physics, Nuclear
Zhi-Wei Liu, Kai-Wen Li, Li-Sheng Geng
Summary: We study baryon-baryon interactions with strangeness S = -2 using leading order covariant chiral effective field theory. We determine the relevant low energy constants by fitting to the latest HAL QCD simulations, considering all coupled channels. Comparing our calculations with experimental data for lambda lambda and (Σ0Λ)-p correlation functions, we find good agreement which demonstrates consistency between theory, experiment, and lattice QCD simulations. We also predict sigma(+)sigma, sigma(+)lambda, and sigma(+)sigma(-) interactions and their momentum correlation functions.
Article
Astronomy & Astrophysics
Peng-Cheng Qiu, De-Liang Yao
Summary: The chiral effective meson-baryon Lagrangian for interactions between doubly charmed baryons and Goldstone bosons is constructed up to q(4) order. A total of 8, 32, and 218 linearly independent invariant monomials of O(q(2)), O(q(3)), and O(q(4)) are considered. This Lagrangian allows for studying the chiral dynamics and relevant phenomenology of doubly charmed baryons at complete one-loop level, and also includes a discussion on the nonrelativistic reduction of the Lagrangian for completeness.
Article
Physics, Nuclear
Xu Zhang, Christoph Hanhart, Ulf-G Meissner, Ju-Jun Xie
Summary: A formalism is discussed for straightforward treatment of the relativistic three-body problem while maintaining the correct analytic structure. It is argued that sacrificing covariance for analyticity can be justified by considering different contributions in a hierarchy, in the spirit of effective field theory. The formalism is applied to the KK(K) over bar system, resulting in the emergence of a(0)(980) and f(0)(980) as hadronic molecules. All inelastic channels are turned off for simplicity.
EUROPEAN PHYSICAL JOURNAL A
(2022)
Review
Physics, Multidisciplinary
Maxim Mai, Ulf -G. Meissner, Carsten Urbach
Summary: In this review, the current understanding of the excited strongly interacting particle spectrum is presented. The systematic and model-independent calculation methods, namely lattice QCD and effective field theories, are discussed. The synergies between these approaches can provide a deeper understanding of the hadron spectrum. The use of the Breit-Wigner parametrization is shown to be inconsistent with chiral symmetry and should be avoided in strongly coupled channels.
PHYSICS REPORTS-REVIEW SECTION OF PHYSICS LETTERS
(2023)
Article
Physics, Multidisciplinary
Meng-Na Tang, Yong-Hui Lin, Feng-Kun Guo, Christoph Hanhart, Ulf-G. Meissner
Summary: The internal structure of charm-strange mesons D-s0*(2317) and D-s1(2460) is being extensively studied. Their narrow widths are due to their dominant decay through isospin-breaking hadronic channels. The decay of D-s1(2460) can also occur through hadronic final states with isospin conservation, but is strongly suppressed due to phase space limitations. By considering the Ds1(2460) as a D*K hadronic molecule, we find that the predicted partial widths and the pi(+)pi(-) invariant mass distribution are consistent with experimental measurements, and suggest possible ways to distinguish between the hadronic molecular and compact state pictures for the D-s1(2460)(+). Predictions for B-s1(0) -> B-s(0) pi(+) pi(-) are also made.
COMMUNICATIONS IN THEORETICAL PHYSICS
(2023)
Article
Multidisciplinary Sciences
Shihang Shen, Serdar Elhatisari, Timo A. Laehde, Dean Lee, Bing-Nan Lu, Ulf-G. Meissner
Summary: The carbon atom is the backbone of organic chemistry and has a complex nucleus in its predominant isotope, C-12. In this study, a model-independent density map of the nuclear states of C-12 is provided using nuclear lattice effective field theory. The well-known Hoyle state is found to have a bent-arm or obtuse triangular arrangement of alpha clusters. All low-lying nuclear states of C-12 are identified as having an intrinsic shape composed of three alpha clusters forming either an equilateral triangle or an obtuse triangle.
NATURE COMMUNICATIONS
(2023)
Article
Physics, Particles & Fields
Daniel Severt, Maxim Mai, Ulf-G. Meissner
Summary: We propose a new finite-volume approach based on an Effective Field Theory Lagrangian to implement two- and three-body dynamics in a transparent way. The formalism utilizes a particle-dimer picture and formulates the quantization conditions based on the self-energy of the decaying particle. The study focuses on the Roper resonance, utilizing input from lattice QCD and phenomenology, and predicts finite-volume energy eigenvalues, which are then compared to existing lattice QCD calculations as initial guidance for precision requirements.
JOURNAL OF HIGH ENERGY PHYSICS
(2023)
Article
Physics, Particles & Fields
H. Alharazin, B. -d. Sun, E. Epelbaum, J. Gegelia, U. -g. Meissner
Summary: This article applies the definition of local spatial densities using sharply localized one-particle states to spin-3/2 systems. Matrix elements of the electromagnetic current and the energy-momentum tensor are considered, and integral expressions of associated spatial distributions in terms of form factors are derived.
JOURNAL OF HIGH ENERGY PHYSICS
(2023)
Article
Multidisciplinary Sciences
Zhenyu Zhang, Jiahao Liu, Jifeng Hu, Qian Wang, Ulf-G. Meissner
Summary: In this study, the nature of hidden charm pentaquarks was investigated using a neural network approach. The results showed that this method could differentiate states with different quantum numbers, providing more insights into the nature of exotic states. Additionally, a comparison between the neural network and fitting methods highlighted similarities and differences in revealing underlying physics.
Article
Physics, Particles & Fields
J. Yu. Panteleeva, E. Epelbaum, J. Gegelia, U. -G. Meissner
Summary: This paper considers the matrix elements of the electromagnetic current and energy-momentum tensor for spin-1 systems with sharply localized states. It discusses their interpretation as local spatial densities of various characteristics of the system in question.
JOURNAL OF HIGH ENERGY PHYSICS
(2023)
Article
Physics, Particles & Fields
J. Yu. Panteleeva, E. Epelbaum, J. Gegelia, U. -G. Meissner
Summary: We determine the definition details of the spatial densities corresponding to the gravitational form factors of spin-0 and spin-1/2 systems using spherically symmetric sharply localized wave packets. The expressions for these spatial densities are provided in reference frames with both zero and non-zero expectation values of the momentum operator.
EUROPEAN PHYSICAL JOURNAL C
(2023)
Article
Astronomy & Astrophysics
Maral Salajegheh, Hamzeh Khanpour, Ulf-G. Meissner, Hadi Hashamipour, Maryam Soleymaninia
Summary: This study presents an updated set of SKMHS diffractive parton distribution functions (PDFs), including the recent diffractive dijet cross-section measurement. The new sets, SKMHS23 and SKMHS23-dijet, are presented at NLO and NNLO accuracy in perturbative QCD. The effect of diffractive dijet data and higher-order QCD corrections on the extracted PDFs and data/theory agreements are clearly examined and discussed.
Article
Physics, Nuclear
Johann Haidenbauer, Ulf-G. Meissner, Andreas Nogga, Hoai Le
Summary: A hyperon-nucleon potential for the S = -1 sector up to third order in the chiral expansion is introduced, considering both the SU(3) flavor symmetry and explicit SU(3) symmetry breaking. An innovative regularization scheme is used, leading to an excellent description of scattering data and the analysis of new data from J-PARC. Results for hypertriton and A = 4 hyper-nuclear separation energies are presented, along with an uncertainty estimate for selected observables in the hyperon-nucleon system.
EUROPEAN PHYSICAL JOURNAL A
(2023)
Article
Physics, Nuclear
Yong-Hui Lin, Hans-Werner Hammer, Ulf-G. Meissner
Summary: Using dispersion theory, the Sigma-to-Lambda transition form factors in electromagnetic interactions are calculated considering the pion electromagnetic form factor, SU(3) chiral perturbation theory, the baryon decuplet, and the pi pi- K coupled-channel effect. The electric form factor is significantly affected by the inclusion of the K channel, while the magnetic form factor is minimally affected. The uncertainties in the three-flavor chiral perturbation theory are estimated using a bootstrap sampling method.
EUROPEAN PHYSICAL JOURNAL A
(2023)
Article
Physics, Particles & Fields
Chao-Wei Shen, Yong-hui Lin, Ulf-G. Meissner
Summary: Using an effective Lagrangian with heavy quark spin symmetry, this study investigates the coupled-channel dynamics of the doubly charmed systems D-(*) Sigma((*))(c). The potential considered includes exchanges of pseudoscalar and vector mesons in the t-channel. By applying the first iterated solution of the N/ D method, several S-wave bound states with isospin I = 1/2 are discovered. These states correspond to open-charm partners of the hidden charm pentaquarks P-psi(N) observed by the LHCb Collaboration.
EUROPEAN PHYSICAL JOURNAL C
(2023)
Article
Physics, Particles & Fields
J. Yu. Panteleeva, E. Epelbaum, J. Gegelia, U-G Meissner
Summary: Using spherically symmetric sharply localized wave packets, we determine the details of defining the spatial densities corresponding to the gravitational form factors of spin-0 and spin-1/2 systems. The expressions for the spatial densities are provided in the frames with both zero and non-zero expectation values of the momentum operator.
EUROPEAN PHYSICAL JOURNAL C
(2023)
Article
Physics, Nuclear
P. Maris, R. Roth, E. Epelbaum, R. J. Furnstahl, J. Golak, K. Hebeler, T. Huether, H. Kamada, H. Krebs, H. Le, Ulf -G. Meissner, J. A. Melendez, A. Nogga, P. Reinert, R. Skibinski, J. P. Vary, H. Witala, T. Wolfgruber
Summary: This paper presents a comprehensive investigation on few-nucleon systems as well as light and medium-mass nuclei, using the current Low Energy Nuclear Physics International Collaboration two-nucleon interactions and three-nucleon forces. By considering higher-order corrections and performing correlated truncation error analysis, the resulting Hamiltonian is shown to successfully predict various observables and spectra of nucleon-deuteron scattering and light p-shell nuclei. However, the charge radii are found to be underpredicted by approximately 10% for the oxygen isotopes and almost 20% for 40Ca and 48Ca.
Article
Astronomy & Astrophysics
Nelson R. F. Braga, Octavio C. Junqueira
Summary: This study investigates the influence of rotation on the transition temperature of strongly interacting matter produced in non-central heavy ion collisions. By using a holographic description of an AdS black hole, the authors extend the analysis to the more realistic case where the matter spreads over a region around the rotational axis. The results show the coexistence of confined and deconfined phases and are consistent with the concept of local temperature in rotating frames developed by Tolman and Ehrenfest.
Article
Astronomy & Astrophysics
Bing Sun, Jiachen An, Zhoujian Cao
Summary: This paper investigates the effect of gravitational constant variation on the propagation of gravitational waves. By employing two analytical methods, the study finds that variations in the gravitational constant result in amplitude and phase corrections for gravitational waves, and the time variation of the gravitational constant can be constrained through the propagation of gravitational waves.
Article
Astronomy & Astrophysics
Abdellah Touati, Zaim Slimane
Summary: This letter presents the first study of Hawking radiation as a tunneling process within the framework of non-commutative gauge theory of gravity. The non-commutative Schwarzschild black hole is reconstructed using the Seiberg-Witten map and the star product. The emission spectrum of outgoing massless particles is computed using the quantum tunneling mechanism. The results reveal pure thermal radiation in the low-frequency scenario, but a deviation from pure thermal radiation in the high-frequency scenario due to energy conservation. It is also found that noncommutativity enhances the correlations between successively emitted particles.
Article
Astronomy & Astrophysics
Shahar Hod
Summary: The travel times of light signals between two antipodal points on a compact star's surface are calculated for two different trajectories. It is shown that, for highly dense stars, the longer trajectory along the surface may have a shorter travel time as measured by asymptotic observers. A critical value of the dimensionless density-area parameter is determined for constant density stars to distinguish cases where crossing through the star's center or following a semi-circular trajectory on the surface has a shorter travel time as measured by asymptotic observers.
