Article
Physics, Nuclear
Rui Peng, Songlin Lyu, Sebastian Konig, Bingwei Long
Summary: A momentum-dependent formulation based on a stationary spin-0 and isospin-1 dibaryon field is proposed to improve convergence of chiral effective field theory in the S-1(0) channel of NN scattering. Rapid order-by-order convergence is found in S-1(0). The study also investigates the triton binding energy and compares it to standard chiral effective field theory with partly perturbative pions, while examining the consistency of the chiral Lagrangian for the new formulation.
Article
Physics, Nuclear
S. K. Saha, D. R. Entem, R. Machleidt, Y. Nosyk
Summary: We present local, position-space chiral NN potentials through four orders of chiral effective field theory. Our potentials accurately reproduce the NN data below 190 MeV and show substantial agreement with the phenomenological AV18 potential in the intermediate range. These potentials provide a solid basis for systematic ab initio calculations of nuclear structure and reactions, and may help solve outstanding problems in microscopic nuclear structure.
Article
Physics, Nuclear
M. Kohno, H. Kamada, K. Miyagawa
Summary: This article presents an expression of partial-wave expansion for three-baryon interactions in chiral effective field theory, which is more general compared to previous methods. By utilizing this derived formula, the folding potential of a ?-deuteron is evaluated, providing valuable information for future studies on ?NN three-baryon forces and their contribution to hypertritons through sophisticated Faddeev calculations. The microscopic understanding of ?NN three-baryon forces, along with two-body ?N interactions, is crucial for the description of hypernuclei and neutron-star matter.
Article
Physics, Nuclear
H. Witala, J. Golak, R. Skibinski
Summary: The computational scheme presented in this study significantly reduces the time required for theoretical predictions based on chiral two- and three-nucleon forces, particularly for observables in the three-nucleon continuum. By solving a reduced number of Faddeev-type integral equations, the workload is minimized, enabling rapid computation of observables for various combinations of contact term strengths. The proposed emulator demonstrates high precision and the ability to accurately reproduce exact results, as shown in the example of elastic nucleon-deuteron scattering observables.
EUROPEAN PHYSICAL JOURNAL A
(2021)
Article
Multidisciplinary Sciences
B. Behzadmoghaddam, M. Radin, S. Bayegan
Summary: In this paper, the chiral effective field theory is used to study the spin singlet channel S-1(0) of proton-proton scattering, adopting a new suggested power counting. The pp zero scattering amplitude is reproduced by including one pion exchange at leading order (LO) and the Coulomb interaction between protons at next-to-leading order (NLO). This provides a systematic improvement up to NLO compared to the result obtained from the Nijm93 potential model.
SCIENTIFIC REPORTS
(2023)
Article
Physics, Multidisciplinary
Roman Skibinski, Jacek Golak, Henryk Witala, Vaibhav Chahar, Evgeny Epelbaum, Andreas Nogga, Volodymyr Soloviov
Summary: In this study, the nucleon-induced deuteron breakup reaction is investigated using the Faddeev approach. The theoretical uncertainties in the predicted cross section, which depend on the value of the cutoff parameter, are determined. Predictions based on different potentials are compared, and the effects of the three-nucleon force are studied. The results show that the dependence of the cross sections on the regulator cutoff is moderate at 135 MeV and much stronger at 200 MeV, with up to 45% variation in specific kinematic configurations.
FRONTIERS IN PHYSICS
(2023)
Article
Astronomy & Astrophysics
Fangcheng He, Chueng-Ryong Ji, W. Melnitchouk, Y. Salamu, A. W. Thomas, P. Wang, X. G. Wang
Summary: The helicity-dependent strange quark distribution in the proton, As, is calculated in a nonlocal chiral SU(3) effective field theory. The polarized strange quark distribution is found to be quite small.
Article
Astronomy & Astrophysics
E. Filandri, L. Girlanda
Summary: A complete set of relativistic nucleon-nucleon contact operators conserving parity and time-reversal has been identified. The corresponding non-relativistic operators contributing in the general reference frame have also been determined. The results indicate the existence of two free low-energy constants that parametrize an interaction dependent on the total nucleon pair momentum P, which is crucial in resolving the long-standing Ay problem in low-energy p-d scattering. Additionally, all remaining P-dependent interactions at the same order are uniquely determined as relativistic corrections.
Article
Physics, Particles & Fields
Qi Zhang, Xiao-Huang Hu, Bing-Ran He, Jia-Lun Ping
Summary: The study explores the pentaquark system with heavy quarks, predicting the existence of various candidates through dynamical calculations. These candidates may represent new particles in the charm and bottom sectors.
EUROPEAN PHYSICAL JOURNAL C
(2021)
Article
Physics, Nuclear
Takayuki Miyagi
Summary: The applicability of nuclear ab initio calculations has expanded rapidly in the past decades, but starting research projects in this field remains challenging due to required numerical expertise. To address this issue, this paper introduces the numerical code NuHamil for generating nucleon-nucleon (NN) and three-nucleon (3N) matrix elements in a spherical harmonic-oscillator basis. Ground-state energies of selected doubly closed shell nuclei are calculated using the no-core shell-model (NCSM) and in-medium similarity renormalization group (IMSRG). The code is written in modern Fortran and supports OpenMP+MPI hybrid parallelization for 3N matrix-element calculations.
EUROPEAN PHYSICAL JOURNAL A
(2023)
Article
Astronomy & Astrophysics
Fangcheng He, Chueng-Ryong Ji, W. Melnitchouk, A. W. Thomas, P. Wang
Summary: In this study, spin-averaged generalized parton distributions (GPDs) of sea quarks in the proton at zero skewness are calculated using nonlocal covariant chiral effective theory. The results provide flavor asymmetries for sea quarks and strange form factors, which are compared with phenomenological extractions and lattice QCD.
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
Zhi-Wei Liu, Jing Song, Kai-Wen Li, Li-Sheng Geng
Summary: By fitting to hyperon-nucleon scattering data, the S = -3 and -4 baryon-baryon interactions are derived, with consideration for SU(3) flavor symmetry-breaking effects. The predicted phase shifts for certain channels are in qualitative agreement with lattice QCD data, while further validation is needed for the S = -4 channel.
Article
Astronomy & Astrophysics
Jun Jiang, Shao-Zhou Jiang, Shi-Yuan Li, Yan-Rui Liu, Zong-Guo Si, Hong-Qian Wang
Summary: The symmetry of the quark model can establish relations between low-energy constants in the baryon chiral perturbation theory. By examining the correspondence between SU(2) and SU(3) descriptions at the quark level, relations between the low-energy constants in different orders of the chiral perturbation theory are found. Numerical analysis provides support for these relations.
Article
Physics, Nuclear
Son T. Nguyen, Matthias R. Schindler, Roxanne P. Springer, Jared Vanasse
Summary: The study extends the analysis of two-body hadronic parity violation from operators with one derivative to operators with three derivatives, within the framework of a pionless effective field theory and large-Nc expansion. The relationships among EFT LECs emerge in the large-Nc expansion, and the renormalization group scale dependence of these LECs is discussed. This analysis can complement lattice QCD calculations and help prioritize future parity-violating experiments.
Article
Physics, Multidisciplinary
Jeremy W. Holt, Mamiya Kawaguchi, Norbert Kaiser
FRONTIERS IN PHYSICS
(2020)
Article
Physics, Multidisciplinary
Jack Brady, Pengsheng Wen, Jeremy W. Holt
Summary: Normalizing flows use a bijective mapping of a simple base distribution to construct a complex distribution, making them well-suited for high-dimensional integrals in quantum many-body calculations; their ability to build highly expressive models of the target integrand enables precise evaluations of nuclear free energy and derivatives; a normalizing flow model trained on one target integrand can efficiently calculate related integrals, supporting future numerical simulations in astrophysics.
PHYSICAL REVIEW LETTERS
(2021)
Article
Physics, Multidisciplinary
T. R. Whitehead, Y. Lim, J. W. Holt
Summary: Researchers have developed a microscopic global nucleon-nucleus optical potential, utilizing an improved local density approximation and modeling with five nuclear forces. The study provides an analysis tool for next-generation rare-isotope beam experiments, with successful computation of optical potentials for 1800 target nuclei without using any adjustable parameters. The uncertainty bands for elastic scattering were generated to handle potential experimental errors.
PHYSICAL REVIEW LETTERS
(2021)
Article
Astronomy & Astrophysics
Kyle Godbey, Zhen Zhang, Jeremy W. Holt, Che Ming Ko
Summary: Using the RVUU model, this study investigates the production of charged pions (pi(+/-)) in Au+Au collisions at root s(NN) = 2.4 GeV. By fitting the experimental data of pi(+/-) multiplicities measured by the HADES Collaboration, the rapidity distributions and transverse momentum spectra of pi(+/-) in collisions at different centralities are well described. However, there are some limitations in the description of pi(+/-) production, indicating the potential need for including the strong potential on pi(+/-) in the RVUU model.
Article
Physics, Nuclear
C. Hebborn, F. M. Nunes, G. Potel, W. H. Dickhoff, J. W. Holt, M. C. Atkinson, R. B. Baker, C. Barbieri, G. Blanchon, M. Burrows, R. Capote, P. Danielewicz, M. Dupuis, Ch Elster, J. E. Escher, L. Hlophe, A. Idini, H. Jayatissa, B. P. Kay, K. Kravvaris, J. J. Manfredi, A. Mercenne, B. Morillon, G. Perdikakis, C. D. Pruitt, G. H. Sargsyan, I. J. Thompson, M. Vorabbi, T. R. Whitehead
Summary: We review recent progress in nuclear optical potentials and emphasize the need for further developments, especially in regions away from stability. An improved description of nuclear reactions involving short-lived isotopes has significant benefits for fundamental science discoveries and applications. We outline the methods used to build optical potentials and discuss the strengths and weaknesses of each approach. We also provide open challenges and recommendations to advance nuclear reaction studies in the rare-isotope beam era.
JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS
(2023)
Article
Astronomy & Astrophysics
Yeunhwan Lim, Jeremy W. Holt
Summary: Recent investigations on the Pb-208 neutron skin thickness have the potential to provide valuable information for the equation of state of neutron stars. This study explores the impact of these investigations on the bulk properties of neutron stars using a Bayesian statistical analysis. The results show modified predictions for the radii, tidal deformabilities, and moments of inertia of neutron stars.
Article
Physics, Nuclear
Xingfu Du, Andrew W. Steiner, Jeremy W. Holt
Summary: In this study, an ensemble of nuclei is incorporated into the equation of state for homogeneous nucleonic matter to develop models suitable for astrophysical simulations. The models are guided by empirical constraints and microscopic many-body theory calculations. The parameters of the model can be varied while maintaining consistency with experimental or observational data, providing a probability distribution of the astrophysical equation of state for hot and dense matter.
Article
Physics, Nuclear
Yeunhwan Lim, Anirban Bhattacharya, Jeremy W. Holt, Debdeep Pati
Summary: The study investigates the nature of an unknown compact object in a binary merger event and determines the maximum neutron star mass based on constraints from various physics models. It is shown that modifications to high-density equations of state are necessary to reconcile theoretical models with current neutron star observations. Furthermore, the existence of very massive neutron stars has a significant impact on the radii of other neutron stars, prompting further research in the field.
Article
Physics, Nuclear
Pengsheng Wen, Jeremy W. Holt
Summary: This study examines the isospin-asymmetry expansion of the nuclear equation of state and focuses on extracting high-order symmetry energy coefficients, including normal terms and terms involving the logarithm of isospin asymmetry. The coefficients, extracted from precise perturbation theory calculations coupled with new finite difference formulas, show that the coefficients of the logarithmic terms are generally larger than those of the normal terms, impacting the proton fraction at large densities. At twice saturation density, these high-order isospin-asymmetry terms can reduce the proton fraction by up to 0.02.
Article
Physics, Nuclear
Yeunhwan Lim, Jeremy W. Holt
Summary: The study shows that three-body forces reduce both the size of the proton pairing gap and the maximum density at which proton pairing may occur. A second-order perturbative treatment of the single-particle spectrum suppresses the proton S-1(0) pairing gap. The estimated critical temperature for proton superconductivity onset is approximately (3.2-5.1) x 10(9) K, consistent with previous theoretical results and a recent Bayesian analysis of neutron star cooling observations.
Article
Physics, Nuclear
T. R. Whitehead, Y. Lim, J. W. Holt
Proceedings Paper
Astronomy & Astrophysics
Jeremy W. Holt, Yeunhwan Lim
XIAMEN-CUSTIPEN WORKSHOP ON THE EQUATION OF STATE OF DENSE NEUTRON-RICH MATTER IN THE ERA OF GRAVITATIONAL WAVE ASTRONOMY
(2019)
Article
Physics, Nuclear
Yeunhwan Lim, Jeremy W. Holt, Robert J. Stahulak
Article
Physics, Nuclear
T. R. Whitehead, Y. Lim, J. W. Holt
Article
Physics, Nuclear
Xingfu Du, Andrew W. Steiner, Jeremy W. Holt