Nuclear Theory·nucl-th

Thursday·October 30, 2025

11 papers—1 primary·10 cross-listed

01
[Submitted on 28 Oct 2025]
Updating GEANIE $^{239}$ Pu prompt $γ$ -ray experimental data using modern Hauser-Feshbach fission fragment decay model
Toshihiko Kawano (1) · Amy E. Lovell (1) · Patrick Talou (1 and 2) · Lee A. Bernstein (3 and 4) ((1) Los Alamos National Laboratory, (2) Stardust Science Labs, (3) University of California, Berkeley, (4) Lawrence Berkeley National Laboratory)
We calculate fission $γ$ rays for neutron-induced reactions on $^{239}$ Pu with the Hauser-Feshbach fission fragment decay model. By applying the calculated fission $γ$ rays as a background contribution, the historical $^{239}$ Pu(n, $x$ n $γ$ ) reaction cross section data measured by the GEANIE (GErmanium Array for Neutron Induced Excitations) spectrometer are corrected. The correction also includes other (n, $x$ n) reactions that have very similar energies to the $γ$ lines reported by GEANIE. In many cases, the original GEANIE data are strongly reduced and they become much closer to the statistical Hauser-Feshbach model predictions. The total inelastic scattering, (n,2n), and (n,3n) cross sections are inferred based on the corrected GEANIE data, and compared with available experimental data as well as the statistical model calculations. Expected $γ$ -ray energy spectra for neutron-induced measurements on $^{239}$ Pu are also discussed.
Comments:
12 pages, 20 figures
Subjects:
Nuclear Theory (nucl-th)
arXiv:
2510.24946 [pdf]
0 citations
02
[Submitted on 28 Oct 2025] (cross-list from hep-ph)
Heavy Quark Energy Loss in the Hybrid Model
Andrea Beraudo🇮🇹 · Jean F. Du Plessis🇺🇸 · Daniel Pablos🇪🇸 · Krishna Rajagopal🇺🇸
Heavy quarks offer an invaluable hard probe of the droplets of quark gluon plasma (QGP) formed in heavy ion collisions at the LHC and RHIC. Given their large mass, they are predominantly produced in hard scattering processes at the earliest moment of a collision and given their rarity they almost never annihilate with a heavy antiquark subsequently. This means that they experience, and probe, the entire history of the expanding, cooling, droplet of QGP from hydrodynamization through hadronization. Quantitative measurements of heavy quark final state observables therefore give us access to information about the transport properties of QGP as well as about medium modifications of hadronization. To date, the Hybrid strong/weak coupling Model of jet quenching has not included any implementation of the heavy-quark sector, which has made it impossible to confront its predictions with measurements of heavy quark and jet observables together, in a unified fashion. Here, we extend the Hybrid Model to investigate heavy quark observables for the first time. We introduce a strongly-coupled calculation of heavy-quark energy loss with the correct behavior when the heavy quarks are either ultrarelativistic or non-relativistic, Gaussian momentum broadening, and recombination of heavy quarks with medium partons using a local color neutralization model of hadronization. We compare our results for the suppression $R_{AA}$ and azimuthal anisotropies $v_{2}$ of B- and D-mesons and $Λ_{c}$ baryons, the $R_{AA}$ of B-tagged jets, as well as baryon-to-meson ratios, with available experimental data from ALICE, ATLAS and CMS.
Comments:
v2: new Figure 11, comparing our calculations to non-prompt J/Psi suppression; two added paragraphs; additional citations. 48 pages, 14 figures
Subjects:
High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
arXiv:
2510.24847 [pdf]
JHEP(2026)·6 citations
03
[Submitted on 28 Oct 2025] (cross-list from hep-lat)
A Euclidean Monte-Carlo-informed route to ground-state preparation for quantum simulation of scalar field theory
Navya Gupta · Christopher David White · Zohreh Davoudi
Quantum simulators hold great promise for studying real-time (Minkowski) dynamics of quantum field theories. Nonetheless, preparing non-trivial initial states remains a major obstacle. Euclidean-time Monte-Carlo methods yield ground-state spectra and static correlation functions that can, in principle, guide state preparation. In this work, we exploit this classical information to bridge Euclidean and Minkowski descriptions for a (1+1)-dimensional interacting scalar field theory. We propose variational ansatz families which achieve comparable ground-state energies, yet exhibit distinct correlations and local non-Gaussianity. By optimizing selected wavefunction moments with Monte-Carlo data, we obtain ansatzes that can be efficiently translated into quantum circuits. Our algorithmic cost analysis shows these circuits' gate complexity scales polynomially in system size. Our work paves the way for systematically leveraging classically-computed information to prepare initial states in quantum field theories of interest in nature.
Comments:
Prepared for the proceedings of the 41st International Symposium on Lattice Field Theory at the University of Liverpool, United Kingdom
Subjects:
High Energy Physics — Lattice (hep-lat); High Energy Physics — Theory (hep-th); Nuclear Theory (nucl-th); Quantum Physics (quant-ph)
arXiv:
2510.24875 [pdf]
0 citations
04
[Submitted on 28 Oct 2025] (cross-list from hep-lat)
Isotensor $π π π$ scattering with a $ρ$ resonant subsystem from QCD
Raúl A. Briceño🇺🇸 · Maxwell T. Hansen🇬🇧 · Andrew W. Jackura🇺🇸 · Robert G. Edwards🇺🇸 · Christopher E. Thomas🇬🇧
This work presents a lattice quantum chromodynamics (QCD) determination of $π π π$ scattering amplitudes for the isospin-2 channel with angular momentum and parity $J^{P} = 1^{+}$ . The calculation is performed using unphysically heavy light-quark masses, corresponding to a pion mass of $m_{π} \approx 400$ ~MeV, for which the $ρ$ meson manifests as a narrow resonance. The analysis employs a previously developed formalism that non-perturbatively relates the finite-volume spectra of two- and three-pion systems to their infinite-volume scattering amplitudes. We combine earlier lattice QCD results for $π π$ systems with isospins 1 and 2 with new determinations of the isospin-2 three-pion finite-volume spectrum, obtained for three cubic, periodic lattice volumes with box length ranging from $\approx 4/ m_{π}$ to $6/ m_{π}$ . These combined data constrain the low-lying partial waves of the infinite-volume three-pion K matrix, from which we solve a set of coupled integral equations to extract the corresponding scattering amplitudes.
Comments:
26 pages, 10 figures, v2 includes mild changes to the outlook, acknowledgments, and additional relevant references
Subjects:
High Energy Physics — Lattice (hep-lat); High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Theory (hep-th); Nuclear Theory (nucl-th)
arXiv:
2510.24894 [pdf]
10 citations
05
[Submitted on 29 Oct 2025] (cross-list from hep-ph)
Impact of shell model interactions on WIMP-nucleus scattering observables for silicon and germanium targets
Raghda Abdel Khaleq🇦🇺 · Madeleine J. Zurowski🇨🇦
The nature of dark matter (DM) remains one of the biggest mysteries in physics today. Dark matter direct detection experiments look for nuclear recoil signals from DM-nucleus elastic scattering, which can be used to characterise DM. Nuclear modelling of the target nucleus may impact the predicted DM-nucleus scattering rates, and affect interpretation of experimental signals. In this work, we investigate the impact of nuclear shell model interactions on DM nuclear responses for silicon and germanium targets using a SuperCDMS-like experimental parameters. Nuclear uncertainties resulting from shell model interaction choice in the nuclear form factors are roughly retained at the scattering rate and exclusion limit levels for certain nuclear responses.
Comments:
6 pages, 8 figures
Subjects:
High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
2510.25197 [pdf]
EPJ Web Conf.(2026)·0 citations
06
[Submitted on 29 Oct 2025] (cross-list from hep-ph)
Vorticity-induced effects from Wess-Zumino-Witten terms
Geraint W. Evans🇹🇼 · Naoki Yamamoto🇯🇵 · Di-Lun Yang🇹🇼
We study vorticity-induced effects arising from the Wess-Zumino-Witten terms for Nambu-Goldstone modes in chiral perturbation theory. We first provide an alternative derivation of the Wess-Zumino-Witten terms in the presence of external vector, axial-vector, and pseudoscalar fields using a derivative expansion of the fermion determinant. We then employ the previously found correspondence in which vorticity is treated as an axial-vector field coupled to Dirac fermions in flat spacetime. Using this, we derive vorticity-induced contributions for Nambu-Goldstone modes in the presence of electromagnetic fields at finite baryon and isospin chemical potentials, including a vorticity-induced current, a magnetic-field-induced angular momentum, and a vorticity-modified photon-pion coupling. We also briefly discuss the phenomenological implications of these vorticity-induced effects.
Comments:
20 pages, no figures; v2: corrected discussion above equation 21
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:
2510.25459 [pdf]
PRD(2026)·5 citations
07
[Submitted on 29 Oct 2025] (cross-list from hep-ph)
Advanced parametrisations for hadronic form factors
Nienke C. Balz🇩🇪 · Florian Herren🇨🇭 · Bastian Kubis🇩🇪 · Simon Mutke🇩🇪 · Méril Reboud🇫🇷
The rich analytic structure of hadronic form factors makes a theoretically consistent yet easily applicable parametrisation cumbersome. Consequently, most parametrisations are limited to reproducing the simplest analytic features sufficient to describe form factors on their first Riemann sheet. Here, we introduce two novel form factor parametrisations that allow resonance poles and left-hand cuts on the second Riemann sheet to be studied, while also making the connection to partial-wave amplitudes manifest.
Comments:
29 pages, 11 figures; v2 as published in JHEP, ancillary file with fit parameters added
Subjects:
High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); High Energy Physics — Lattice (hep-lat); Nuclear Theory (nucl-th)
arXiv:
2510.25584 [pdf]
JHEP(2026)·4 citations
08
[Submitted on 29 Oct 2025] (cross-list from hep-ph)
Out-of-equilibrium contributions to charm hadrons in a fluid-dynamic approach
Rossana Facen🇩🇪 · Federica Capellino🇩🇪 · Eduardo Grossi🇮🇹 · Andrea Dubla🇩🇪 · Silvia Masciocchi🇩🇪
Building on previous studies that demonstrated the applicability of a fluid-dynamic description of charm quarks in the quark-gluon plasma, the present work extends the framework by computing the out-of-equilibrium contributions to the distribution function of charm hadrons. The analysis includes corrections arising from the initial out-of-equilibrium distribution of charm quarks after a free-streaming phase, as well as from the freeze-out surface within fluid dynamics. These results enable the exact computation of integrated yields and transverse momentum distributions of charm hadrons for different values of the spatial diffusion coefficient, thereby providing the basis for a systematic determination of the charm transport coefficients. A preliminary comparison of our model with the available experimental data shows compatibility within uncertainties. In addition, the limits of applicability of the approach are identified by determining the transverse-momentum region in which charm hadrons are described by a well-defined, positive distribution function.
Comments:
18 pages, 9 figures, GitHub repository at: https://github.com/fafafrens/Fluidum.jl
Subjects:
High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
2510.25601 [pdf]
1 citation
09
[Submitted on 29 Oct 2025] (cross-list from hep-ph)
$QQ Q ˉ Q ˉ$ Quark System and Gauge/String Duality
Oleg Andreev🇩🇪
We propose a stringy description of a system composed of two heavy quarks and two heavy antiquarks, mimicking that in pure $S U (3)$ gauge theory. We present both analytical and numerical studies of the string configurations for rectangular geometries. As an application, we analyze the two lowest Born-Oppenheimer potentials. Our results suggest that, depending on the geometry and quark ordering, the ground state of the $QQ Q ˉ Q ˉ$ system may be a hadronic molecule, a tetraquark state, or a superposition of the two. For general geometries, we derive the asymptotic expression for the energy of the tetraquark configuration in the infrared limit and extend this result to multiquark configurations. Here we also demonstrate the universality of the string tension.
Comments:
38 pages, many figures; v2: minor corrections; v3: further improvements and clarifications; v4: typos corrected
Subjects:
High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Lattice (hep-lat); High Energy Physics — Theory (hep-th); Nuclear Theory (nucl-th)
arXiv:
2510.25605 [pdf]
PRD(2026)·0 citations
10
[Submitted on 29 Oct 2025] (cross-list from hep-ph)
Minijet thermalization and jet transport coefficients in QCD kinetic theory
Kirill Boguslavski🇫🇷 · Florian Lindenbauer🇦🇹 · Aleksas Mazeliauskas🇩🇪 · Adam Takacs🇩🇪 · Fabian Zhou🇩🇪
We apply weakly coupled QCD kinetic theory to investigate the thermalization of high-momentum on-shell partons (minijets) in a Quark-Gluon Plasma (QGP). Our approach incorporates isotropic hard thermal loop screening to model soft quark and gluon exchanges, allowing us to verify consistency with established analytic results of jet transport coefficients. We perform kinetic simulations of minijets propagating through a thermal gluon plasma, incorporating both collinear radiation and elastic scatterings. The resulting evolution is compared to predictions from jet transport coefficients, including the longitudinal and transverse jet-quenching parameters $q^$ , energy loss, and the drag coefficient. We find that standard definitions of jet transport coefficients neglect the contributions from recoiling medium particles. Including these contributions restores consistency with the kinetic evolution. Finally, we show that the minijet thermalization time scales remarkably well with $q^$ and we produce a phenomenological estimate of the minijet quenching time in heavy-ion collisions.
Comments:
22 pages, 11 figures
Subjects:
High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
2510.25669 [pdf]
JHEP(2026)·6 citations
11
[Submitted on 29 Oct 2025] (cross-list from quant-ph)
Symmetry and Asymmetry in Bosonic Gaussian Systems: A Resource-Theoretic Framework
Nikolaos Koukoulekidis · Iman Marvian
We study the interplay of symmetries and Gaussianity in bosonic systems, under closed and open dynamics, and develop a resource theory of Gaussian asymmetry. Specifically, we focus on Gaussian symmetry-respecting (covariant) operations, which serve as the free operations in this framework. We prove that any such operation can be realized via Gaussian Hamiltonians that respect the symmetry under consideration, coupled to an environment prepared in a symmetry-respecting pure Gaussian state. We further identify a family of tractable monotone functions of states that remain non-increasing under Gaussian symmetry-respecting dynamics, and are exactly conserved in closed systems. We demonstrate that these monotones are not generally respected under non-Gaussian symmetry-respecting dynamics. Along the way, we provide several technical results of independent interest to the quantum information and optics communities, including a new approach to the Stinespring dilation theorem, and an extension of Williamson's theorem for the simultaneous normal mode decomposition of Gaussian systems and conserved charges.
Comments:
24 pages + 45 pages of appendices, 6 figures. Comments welcome
Subjects:
Quantum Physics (quant-ph); Statistical Mechanics (cond-mat.stat-mech); High Energy Physics — Theory (hep-th); Mathematical Physics (math-ph); math.MP (math.MP); Nuclear Theory (nucl-th)
arXiv:
2510.25719 [pdf]
4 citations

Affiliations

first authorsco-authorsvia INSPIRE