Nuclear Theory·nucl-th

Monday·September 30, 2024

15 papers—3 primary·12 cross-listed

01
[Submitted on 26 Sept 2024]
An Evaluation Of The Possible Effect Of Tetra-neutron Production On Ternary Fission Yields
H. Pais · G. Röpke · J. B. Natowitz
In this work, we study the effect of including a resonant state of four neutrons in the low-density warm nuclear equation of state, using a relativistic mean-field formalism, where in-medium effects are considered. For that purpose, the abundances of 62 different clusters immersed in a gas of protons and neutrons, are calculated with and without the presence of this resonant tetraneutron state. Ternary fission experiments are environments where not only these clusters can be formed, but also where such thermodynamic conditions of low densities and moderate temperatures can be achieved. The calculated yields of isotopes with and without the tetraneutron included are then compared with experimentally observed ternary fission yields. While the results indicate that the tetraneutron has little effect on yields of other clusters under the existing ternary fission conditions, a possibly observable effect on yields of clusters emitted from the neck region in mid-peripheral heavy ion collisions is clearly suggested.
Comments:
8 pages, 6 figures
Subjects:
Nuclear Theory (nucl-th); High Energy Astrophysical Phenomena (astro-ph.HE)
arXiv:
2409.18232 [pdf]
0 citations
02
[Submitted on 26 Sept 2024]
Coupled-Cluster Calculations of Infinite Nuclear Matter in the Complete Basis Limit Using Bayesian Machine Learning
Julie Butler · Morten Hjorth-Jensen · Gustav R. Jansen
Infinite nuclear matter provides valuable insights into the behavior of nuclear systems and aids our understanding of atomic nuclei and large-scale stellar objects such as neutron stars. However, partly due to the large basis needed to converge the system's binding energy, size-extensive methods such as coupled-cluster theory struggle with long computational run times, even using the nation's largest high-performance computing facilities. This research introduces a novel approach to the problem. We propose using a machine learning method to predict the coupled-cluster energies of infinite matter systems in the complete basis limit, leveraging only data collected using smaller basis sets. This method promises to deliver high-accuracy results with significantly reduced run times. The sequential regression extrapolation (SRE) algorithm, based on Gaussian processes, was created to perform these extrapolations. By combining Bayesian machine learning with a unique method of formatting the training data, we can create a powerful extrapolator that can make accurate predictions given very little data. The SRE algorithm successfully predicted the CCD(T) energies for pure neutron matter across six densities near nuclear saturation density, with an average error of 0.0083 MeV/N. The algorithm achieved an average error of 0.038 MeV/A for symmetric nuclear matter. These predictions were made with a time savings of 83.8 node hours for pure neutron matter and 284 node hours for symmetric nuclear matter. Additionally, the symmetry energy at these six densities was predicted with an average error of 0.031 MeV/A and a total time savings of 368 node hours compared to the traditional converged coupled-cluster calculations performed without the SRE algorithm.
Subjects:
Nuclear Theory (nucl-th)
arXiv:
2409.18234 [pdf]
0 citations
03
[Submitted on 27 Sept 2024]
Light $Λ$ hypernuclei studied with chiral hyperon-nucleon and hyperon-nucleon-nucleon forces
Hoai Le🇩🇪 · Johann Haidenbauer🇩🇪 · Ulf-G. Meißner🇩🇪 · Andreas Nogga🇩🇪
A study of light $Λ$ hypernuclei in chiral effective field theory is presented. For the first time chiral $Λ$ NN and $Σ$ NN three-body forces are included consistently. The calculations are performed within the no-core shell model. Results for the separation energies of the hypernuclei $_{Λ}^{3} H$ , $_{Λ}^{4} H$ / $_{Λ}^{4} He$ , $_{Λ}^{5} He$ , and $_{Λ}^{7} Li$ are given. It is found that the experimental values can be fairly well reproduced once YNN three-body forces are taken into account.
Comments:
6 pages, 2 figures
Subjects:
Nuclear Theory (nucl-th)
arXiv:
2409.18577 [pdf]
PRL(2025)·29 citations
04
[Submitted on 25 Sept 2024] (cross-list from hep-ph)
Investigation of the internal structure of the deuteron against the background of two-photon exchange effects in elastic electron-deuteron scattering
Ya. D. Krivenko-Emetov🇺🇦 · O. S. Shevchuk🇺🇦
The aim of this work is to investigate the simultaneous influence of two-photon effects in quantum electrodynamics (QED) and logarithmic corrections in quantum chromodynamics (QCD) on certain observable experimental quantities (structure factors $A$ and $B$ ) in elastic electron-deuteron scattering. Analyzing these effects broadens our understanding of particle physics, particularly the manifestations of quark-gluon degrees of freedom in the deuteron. Keywords: elastic electron-deuteron scattering, structure of the deuteron, deuteron structure functions, QCD, QED, quark, gluon, two-photon exchange effects, theory-data comparison.
Comments:
11 pages, 5 figures(Presented at the XXXI Annual Scientific Conference of the Institute for Nuclear Research, Kyiv, May 27-31, 2024)
Subjects:
High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
2409.18149 [pdf]
Nucl.Phys.Atom.Energy(2024)·3 citations
05
[Submitted on 26 Sept 2024] (cross-list from hep-ph)
Tracking Energy Loss in Heavy Ion Collisions
João Barata🇺🇸 · Ian Moult🇺🇸 · João M. Silva🇵🇹
The main modification to high $p_{t}$ jets evolving in the quark gluon plasma is the depletion of their energy to the thermal background. Despite the prominent role played by energy loss effects in jet quenching, their theoretical description is still limited, being, to a large extent, driven by phenomenological considerations. As the field moves towards the measurement of multi-scale jet substructure observables, it is necessary to develop new field theoretic techniques to describe energy loss. In this letter, we highlight a formal similarity between energy loss, and the renormalization group based track function formalism for computing jet substructure observables on charged particles. We introduce an energy loss function, $L_{i} (x)$ , tracking the energy fraction $x$ flowing from an initial hard parton $i$ down to the measured hadrons, and show that its renormalization group evolution can be studied in perturbative QCD, and is related to that of the track functions. The features of this new approach are illustrated in the computation of projected energy correlators, opening the window to a better theoretical treatment of these observables in heavy ion collisions.
Comments:
5 pages, 1 figure
Subjects:
High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
2409.18174 [pdf]
8 citations
06
[Submitted on 27 Sept 2024] (cross-list from cond-mat.quant-gas)
First Principle Predictions for Cold Fermionic Gases Near Criticality via Critical Boson Dominance and Anomaly Matching
Shashin Pavaskar🇺🇸 · Ira Z. Rothstein
Recently the authors have developed an effective field theory formalism to systematically describe cold fermionic gases near the unitary limit. The theory has enhanced predictive power due to the fact that interactions are dominated by the exchange of a gapped critical boson whose couplings and mass are fixed by matching the dilatation anomaly between the UV and IR theories. We utilize this theory to give analytic predictions for the compressibility and magnetic susceptibility for fermions near unitarity with attractive interactions above the critical temperature $T_{c}$ , with a well defined theoretical error. The inputs to the predictions are: the scattering length $a$ , the effective mass $m^{⋆}$ and contact parameter $C ~ (a)$ . We then compare our predictions to numerical simulations and find excellent agreement within the window of scattering lengths where the EFT is valid ( $10 \geq∣ k_{F} a ∣\geq 1$ ). Experimental corroboration of this theory supports critical point that can be describe by the inclusion of a scalar dilaton mode, whose action is fixed by symmetries.
Comments:
6 pages, 3 figures
Subjects:
Quantum Gases (cond-mat.quant-gas); High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Theory (hep-th); Nuclear Theory (nucl-th)
arXiv:
2409.18379 [pdf]
1 citation
07
[Submitted on 27 Sept 2024] (cross-list from nucl-ex)
The glue that binds us all -- Latin America and the Electron-Ion Collider
A. C. Aguilar🇧🇷 · A. Bashir🇲🇽 · J. J. Cobos-Martínez🇲🇽 · A. Courtoy🇲🇽 · B. El-Bennich🇧🇷 · D. de Florian🇦🇷 · T. Frederico🇧🇷 · V. P. Gonçalves🇧🇷 · M. Hentschinski🇲🇽 · R. J. Hernández-Pinto🇲🇽 · G. Krein🇧🇷 · M. V. T. Machado🇧🇷 and 14 other authors
The Electron-Ion Collider, a next generation electron-hadron and electron-nuclei scattering facility, will be built at Brookhaven National Laboratory. The wealth of new data will shape research in hadron physics, from nonperturbative QCD techniques to perturbative QCD improvements and global QCD analyses, for the decades to come. With the present proposal, Latin America based physicists, whose expertise lies on the theory and phenomenology side, make the case for the past and future efforts of a growing community, working hand-in-hand towards developing theoretical tools and predictions to analyze, interpret and optimize the results that will be obtained at the EIC, unveiling the role of the glue that binds us all. This effort is along the lines of various initiatives taken in the U.S., and supported by colleagues worldwide, such as the ones by the EIC User Group which were highlighted during the Snowmass Process and the Particle Physics Project Prioritization Panel (P5).
Comments:
White Paper contribution to the Latin American Strategy Forum for Research Infrastructure (III LASF4RI). Updated version includes an extended discussion of the "Perspectives and Challenges" section and an additional section about "Current projects and future Latin American contributions to the EIC". Accepted for publication in Brazilian Journal of Physics
Subjects:
Nuclear Experiment (nucl-ex); High Energy Physics — Experiment (hep-ex); High Energy Physics — Lattice (hep-lat); High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
2409.18407 [pdf]
Braz.J.Phys.(2025)·4 citations
08
[Submitted on 27 Sept 2024] (cross-list from hep-ph)
Improved modeling of $γ γ$ processes in ultraperipheral collisions at hadron colliders
Nicolas Crépet🇫🇷 · David d'Enterria🇨🇭 · Hua-Sheng Shao🇫🇷
The CERN LHC is not only the current energy-frontier collider for parton-parton collisions, but has proven a powerful photon collider providing photon-photon ( $γ γ$ ) collisions at center-of-mass energies and luminosities never reached before. The latest theoretical developments implemented in the gamma-UPC Monte Carlo (MC) event generator, which can calculate arbitrary exclusive final state produced via $γ γ$ fusion in ultraperipheral collisions (UPCs) of protons and/or nuclei at the LHC, are presented. These include azimuthal modulations of dilepton pairs produced in the $γ γ \to ℓ^{+} ℓ^{-}$ process, and neutron emission probabilities for photoexcited lead ions in PbPb UPCs. A few comparisons of the results of the updated gamma-UPC v.1.6 code to relevant RHIC and LHC data are presented.
Comments:
6 pages, 3 plots. DIS'24 Proceedings
Subjects:
High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
arXiv:
2409.18485 [pdf]
PoS(2025)·5 citations
09
[Submitted on 27 Sept 2024] (cross-list from hep-ph)
Decay behavior of hidden-strange hadronic molecular state $N (2270)$
Di Ben🇨🇳 · Shu-Ming Wu🇨🇳
In this article, we systematically discuss the decay patterns of the hidden-strange hadronic molecular state $N (2270)$ which is assumed as an S-wave $K^{*} Σ^{*}$ shallow bound state with its possible quantum numbers $J^{P}$ which are $1/2^{-}$ , $3/2^{-}$ and $5/2^{-}$ . By using the effective Lagrangian approach and considering pseudo-scalar meson and vector meson exchanges, we have thoroughly calculated and discussed the decay behavior of the $N (2270)$ molecular state, including hadronic and radiative decay and the cutoff dependence, for different $J^{P}$ values. For all three cases, $K^{*} Λ$ , $K^{*} Σ$ , and $ρN$ final states are always included as the main decay channels. However, the $K Λ$ , $π N$ and $π Δ$ final states exhibit notable differences. These different decay properties will provide valuable guidance for future experimental searches and aid in distinguishing different $J^{P}$ assumptions and understanding their internal structures.
Comments:
10 pages, 7 figures, 5 tables
Subjects:
High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
2409.18493 [pdf]
PRC(2025)·5 citations
10
[Submitted on 27 Sept 2024] (cross-list from hep-ph)
Preponderant Orbital Polarization in Relativistic Magnetovortical Matter
Kenji Fukushima🇯🇵 · Koichi Hattori🇨🇳 · Kazuya Mameda🇯🇵
We establish thermodynamic stability and gauge invariance in the magnetovortical matter of Dirac fermions under the coexistent rotation and strong magnetic field. The corresponding partition function reveals that the orbital contribution to bulk thermodynamics preponderates over the conventional contribution from anomaly-related spin effects. This orbital preponderance macroscopically manifests itself in the sign inversion of the induced charge and current in the magnetovortical matter, and can be tested experimentally as the flip of the angular momentum polarization of magnetovortical matter when the magnetic field strength is increased.
Comments:
6 pages (main) + 7 pages (supplemental), 1 figure
Subjects:
High Energy Physics — Phenomenology (hep-ph); Mesoscale and Nanoscale Physics (cond-mat.mes-hall); High Energy Physics — Theory (hep-th); Nuclear Theory (nucl-th)
arXiv:
2409.18652 [pdf]
PRL(2025)·8 citations
11
[Submitted on 27 Sept 2024] (cross-list from hep-ph)
Updates on transversity extractions
Carlo Flore🇮🇹
We give a brief overview on some of the latest results on the transversity function. We focus on some recent extractions from azimuthal asymmetries data measured in semi-inclusive deep-inelastic scattering processes, and on the impact of transverse single-spin asymmetry data measured in polarised proton-proton collisions on these extractions.
Comments:
8 pages, 5 figures. Proceedings for the 7th International Workshop on "Transverse phenomena in hard processes and the transverse structure of the proton (Transversity2024)", 3-7 June 2024, Trieste, Italy
Subjects:
High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Theory (nucl-th)
arXiv:
2409.18751 [pdf]
PoS(2024)·1 citation
12
[Submitted on 27 Sept 2024] (cross-list from hep-th)
Hydrodynamics in the Carrollian regime
Kedar S. Kolekar🇨🇳 · Taniya Mandal🇮🇳 · Ashish Shukla🇮🇳 · Pushkar Soni🇮🇳
Carroll hydrodynamics arises in the $c \to 0$ limit of relativistic hydrodynamics. Instances of its relevance include the Bjorken and Gubser flow models of heavy-ion collisions, where the ultrarelativistic nature of the flow makes the physics effectively Carrollian. In this paper, we explore the structure of hydrodynamics in what can be termed as the Carrollian regime, where instead of keeping only the leading terms in the $c \to 0$ limit of relativistic hydrodynamics, we perform a small- $c$ expansion and retain the subleading terms as well. We do so both for perfect fluids as well as viscous fluids incorporating first order derivative corrections. As apposite applications of the formalism, we utilize the subleading terms to compute modifications to the Bjorken and Gubser flow equations which bring in, in particular, dependence on rapidity.
Comments:
v1: 31 pages, 1 figure; v2: Minor modifications and improvements, several additional references; v3: Added discussion about various symmetries involved in section 5, added a new appendix demonstrating local Carroll boost invariance of the hydrodynamic equations, added a reference; v4: Reference added; v5: additional discussion added in appendix A, published in IJMP-A
Subjects:
High Energy Physics — Theory (hep-th); High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
2409.18763 [pdf]
Int.J.Mod.Phys.A(2026)·13 citations
13
[Submitted on 27 Sept 2024] (cross-list from astro-ph.HE)
New Insights into Supradense Matter from Dissecting Scaled Stellar Structure Equations
Bao-Jun Cai · Bao-An Li
The strong-field gravity in General Relativity (GR) realized in neutron stars (NSs) renders the Equation of State (EOS) $P (ε)$ of supradense neutron star (NS) matter to be essentially nonlinear and refines the upper bound for $ϕ \equiv P / ε$ to be much smaller than the Special Relativity (SR) requirement with linear EOSs, where $P$ and $ε$ are respectively the pressure and energy density of the system considered. Specifically, a tight bound $ϕ ≲ 0.374$ is obtained by anatomizing perturbatively the intrinsic structures of the scaled Tolman--Oppenheimer--Volkoff (TOV) equations without using any input nuclear EOS. New insights gained from this novel analysis provide EOS-model independent constraints on properties (e.g., density profiles of the sound speed squared $s^{2} = \d P / \d ε$ and trace anomaly $Δ = 1/3 - ϕ$ ) of cold supradense matter in NS cores. Using the gravity-matter duality in theories describing NSs, we investigate the impact of gravity on supradense matter EOS in NSs. In particular, we show that the NS mass $M_{NS}$ , radius $R$ and its compactness $ξ \equiv M_{NS} / R$ scale with certain combinations of its central pressure and energy density (encapsulating its central EOS). Thus, observational data on these properties of NSs can straightforwardly constrain NS central EOSs without relying on any specific nuclear EOS-model.
Comments:
Published version with more references
Subjects:
High Energy Astrophysical Phenomena (astro-ph.HE); Astrophysics of Galaxies (astro-ph.GA); High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
arXiv:
2409.18854 [pdf]
Front.Astron.Space Sci.(2024)·4 citations
14
[Submitted on 27 Sept 2024] (cross-list from hep-ph)
Impact of dark boson mediated feeble interaction between dark matter and hadronic matter on $f$ -mode oscillation of neutron stars
Debashree Sen🇰🇷 · Atanu Guha🇰🇷
We studied the possible presence of dark matter (DM) in neutron stars (NSs) and the structural properties of the DM admixed NSs (DMANSs) in one of our recent works \cite{Guha:2024pnn}. The feeble interaction between the fermionic DM ( $χ$ ) with the hadronic matter is introduced through a dark scalar ( $ϕ$ ) and a dark vector ( $ξ$ ) boson as mediators. The allowed range of the mass of the fermionic DM ( $m_{χ}$ ), for a particular range of DM Fermi momentum ( $k_{F}^{χ}$ ), was obtained in the same work \cite{Guha:2024pnn} with respect to the various astrophysical constraints on the structural properties of compact stars viz. the mass, radius and tidal deformability. The present work is dedicated to the calculation and study of non-radial oscillation of the DMANSs using Cowling approximation. We particularly investigate the effect of presence of DM on the fundamental ( $f$ ) mode oscillation frequencies of the DMANSs utilizing the previously obtained range of $m_{χ}$ for four different hadronic models. In this work we thoroughly investigate how the individual and combined effects of $m_{χ}$ and $k_{F}^{χ}$ affect the $f$ -mode oscillation frequency. Within the framework of our DMANS models, for a particular value of $k_{F}^{χ}$ , the range of $f_{ma x}^{D M A N S}$ with respect to the allowed range of $m_{χ}$ , is also obtained in the present work for four different hadronic models. Since in the present era, the 1.4 and 2.01 $M_{⊙}$ NSs are of special interest after the detection of GW170817 and PSR J0740+6620, we particularly investigate, for the four hadronic models, the range of $f_{1.4}^{D M A N S}$ and $f_{2.01}^{D M A N S}$ with respect to the acceptable range of $m_{χ}$ corresponding to the range of $k_{F}^{χ}$ .
Comments:
Accepted for Publication is Phys. Rev. D; https://journals.aps.org/prd/accepted/cb07fQ7eG101a43b86a417d4b7d78185f8333ca5a
Subjects:
High Energy Physics — Phenomenology (hep-ph); High Energy Astrophysical Phenomena (astro-ph.HE); Nuclear Theory (nucl-th)
arXiv:
2409.18890 [pdf]
PRD(2024)·12 citations
15
[Submitted on 27 Sept 2024] (cross-list from hep-ph)
Energy-momentum correlators of fermions at finite temperature and density
Sourav Dey🇮🇳 · Samapan Bhadury🇵🇱 · Wojciech Florkowski🇵🇱 · Radoslaw Ryblewski🇵🇱 · Amaresh Jaiswal🇮🇳
Equal-time commutators of different components of the energy-momentum tensor at spatially separated points are calculated for a relativistic quantum Fermi gas at finite temperature and density. Different definitions of such components, also known as different pseudogauges, are used and smeared with a Gaussian profile characterized by the width $σ$ . In this way, we introduce observables that may represent measurements of energy and momentum in a spatial region of size $σ$ . We find that the obtained commutators are sensitive to the pseudogauge chosen if the probed systems or the spatial separation are small. The pseudogauge dependence is expected as different quantum operators are analyzed in this case. On the other hand, we find that for sufficiently large probed systems or with large separation, the studied commutators are pseudogauge independent.
Comments:
22 pages, 3 figures
Subjects:
High Energy Physics — Phenomenology (hep-ph); Quantum Gases (cond-mat.quant-gas); High Energy Physics — Theory (hep-th); Nuclear Theory (nucl-th)
arXiv:
2409.18912 [pdf]
PRD(2024)·4 citations

Affiliations

first authorsco-authorsvia INSPIRE