Nuclear Theory·nucl-th

Friday·September 26, 2025

8 papers—4 primary·4 cross-listed

01
Bridging Quantum Computing and Nuclear Structure: Atomic Nuclei on a Trapped-Ion Quantum Computer
Sota Yoshida🇯🇵 · Takeshi Sato🇯🇵 · Takumi Ogata🇯🇵 · Masaaki Kimura🇯🇵
We demonstrate quantum simulations of strongly correlated nuclear many-body systems on the RIKEN-Quantinuum Reimei trapped-ion quantum computer, targeting ground states of oxygen, calcium, and nickel isotopes. By combining a hard-core-boson representation of the nuclear shell model with a pair-unitary coupled-cluster doubles ansatz, we achieve sub-percent relative error in the ground-state energies compared to noise-free statevector simulations. Our approach leverages symmetry-aware state preparation and particle-number post-selection to efficiently capture pairing correlations characteristic of systems with same-species nucleons. These findings highlight the viability of high-fidelity trapped-ion platforms for nuclear physics applications and provide a foundation for scaling to more complex nuclear systems.
nucl-thquant-phPRResearch(2026)·9 citations
02
Nonlinear corrections to the nuclear heavy flavor structure functions
F.Abdi🇮🇷 · B.Rezaei🇮🇷
We study numerically the small- $x$ behaviour of the nuclear gluon distribution function $G^{A} (x, Q^{2})$ at next-to-leading order (NLO) approximation of the Gribov-Levin-Ryskin-Mueller-Qiu, Zhu-Ruan-Shen (GLR-MQ-ZRS) nonlinear equation and quantify the impact of gluon recombination in the kinematic range of $x \leq 1 0^{- 2}$ and $Q^{2} \geq 5 GeV^{2}$ respectively. The results are comparable to the Rausch-Guzey-Klasen (RGK) [J.Rausch, V.Guzey and M.Klasen, Phys. Rev. D 107, 054003 (2023)] nuclear gluon distributions and the nCTEQ15 parametrization at the corresponding $Q^{2}$ values. Using the solutions of $G^{A} (x, Q^{2})$ in the framework of the nonlinear GLR-MQ-ZRS evolution equation, the linear and nonlinear behavior of the charm structure functions of nuclei per nucleon $F_{2}^{c c ˉ - A} (x, Q^{2})$ and $F_{L}^{c c ˉ - A} (x, Q^{2})$ are considered. The results reveal that nonlinear corrections play an important role in charm nuclear reduced cross sections at small- $x$ and low $Q^{2}$ values. The computed results are compared with experimental data from the H1 and ZEUS Collaborations.
nucl-thhep-phPRC(2025)·0 citations
03
Probing Initial State Clustering through Photon Anisotropic Flow in 7A TeV $^{16}$ O+ $^{16}$ O Collisions at the LHC
Sanchari Thakur🇮🇳 · Pingal Dasgupta🇭🇺 · Rupa Chatterjee🇮🇳 · Sinjini Chandra🇮🇳 · Sidharth K. Prasad🇮🇳
The presence of $α$ clustered structures in light nuclei can enhance the initial spatial anisotropies in relativistic nuclear collisions relative to those arising from nuclei with uniform density distributions. Thus, observables that are strongly sensitive to the initial geometry can be a more efficient probe of the clustered structures than observables dominated by final state dynamics. We investigate the collisions of $α$ clustered oxygen nuclei at $s_{N N} = 7$ A TeV at the LHC using the GLISSANDO initial state model along with the MUSIC event-by-event hydrodynamical framework. The tetrahedral $α$ clustered structure of $^{16}$ O leads to significantly larger initial triangular eccentricity $ϵ_{3}$ than collisions with uniform density distributions especially in the most central events. The spatial eccentricity $ϵ_{2}$ is found to be relatively less sensitive to the initial state clustered structure. The production of thermal photons is estimated to be only marginally influenced by clustering for both central as well as peripheral collisions. In contrast, the photon triangular flow coefficient $v_{3} (p_{T})$ is strongly affected by initial state clustering resulting in substantially larger values in both central and peripheral collisions. An experimental determination of photon anisotropic flow together with the ratios of flow coefficients in $^{16}$ O+ $^{16}$ O collisions therefore expected to provide valuable insight into the possible clustered structure in light nuclei and also to constrain parameters in theoretical modeling.
nucl-thhep-phEPJC(2026)·0 citations
04
Effects of mean-field momentum dependence on pion production in intermediate-energy heavy-ion collisions
Xin Li🇨🇳 · Si-Pei Wang🇨🇳 · Zhen Zhang🇨🇳 · Rui Wang🇨🇳 · Jie Pu🇨🇳 · Chun-Wang Ma🇨🇳 · Lie-Wen Chen🇨🇳
Pion production in heavy-ion collisions at intermediate energies provides an important probe of the collision dynamics and nuclear matter equation of state, especially the high-density behavior of the symmetry energy. Using the lattice Boltzmann-Uehling-Uhlenbeck transport model with a recently developed nuclear effective interaction based on the so-called N $5$ LO Skyrme pseudopotential, we investigate the effects of the momentum dependence of nucleon mean-field potentials on the pion production in Au+Au collisions at a beam energy of $1.23$ ~GeV/nucleon. We find that a stronger momentum dependence, for which the nucleon mean-field potentials increase faster with momentum, generally suppresses pion production. This feature can be understood in terms of the mean-field-induced modification of nucleon high-momentum phase space during the compression stage: a stronger momentum dependence can reduce the relative fraction of high-momentum nucleons in heavy-ion collisions, thereby suppressing the production of $Δ$ resonances and pions.
nucl-thhep-phnucl-exPLB(2026)·6 citations
05
Roles of $U (1)$ axial anomaly effects in cold and dense two-color QCD with $2 + 2$ flavors
Manato Sakai🇯🇵 · Daiki Suenaga🇯🇵
We explore phase structures and hadron mass spectra in cold and dense two-color QCD with $2 + 2$ flavors where the sign problem disappears. We particularly focus on $U (1)$ axial anomaly effects. We employ an $N_{f} = 2 + 2$ linear sigma model based on the $S U (8)$ Pauli-Gürsey symmetry to describe negative-parity as well as positive-parity hadrons, for which low-energy excitations are appropriately described particularly in the baryon superfluid phase with light diquark condensates. As a result, the strange chiral condensate is found to be enhanced in the superfluid phase owing to the flavor-mixing structure of $U (1)$ axial anomaly effects. We also confirm this enhancement by means of the Nambu--Jona-Lasinio model. Besides, our present analysis predicts the existence of a novel superfluid phase where heavy diquarks condense in dense regime. The topological susceptibility with $2 + 2$ flavors from the viewpoints of the anomaly effects and chiral-symmetry restoration is investigated. Furthermore, we derive a complete inverse mass hierarchy for negative-parity diquarks with sufficient anomaly effects. Our findings are expected to provide future lattice simulations with useful information on flavor-symmetry violation from the $U (1)$ axial anomaly aspects in cold and dense two-color QCD medium.
↳ hep-phhep-latnucl-thPRD(2025)·1 citation
06
Spectrum of Light Hexaquark States in Triquark-antitriquark Configuration
Xuan-Heng Zhang🇨🇳 · Sheng-Qi Zhang🇨🇳 · Cong-Feng Qiao🇨🇳
To understand the nature of $X (2075)$ and $X (2085)$ observed by the BESIII collaboration in the $p Λ ˉ$ system, we systematically investigate the possibility that these states are compact hexaquark with triquark-antitriquark configurations for the first time. Within the framework of QCD sum rules, the mass spectrum and decay constants of such hexaquark states with quantum numbers $J^{P} = 0^{-}, 0^{+}, 1^{-}, 1^{+}$ are studied. Consequently, six independent and nondegenerate hexaquark candidates are obtained, among which two $J^{P} = 1^{-}$ states exhibit masses consistent with $X (2075)$ , while the two $J^{P} = 1^{+}$ states differ markedly from the mass of $X (2075)$ or $X (2085)$ . The remaining two states with $J^{P} = 0^{+}$ and $0^{-}$ may serve as predictions for potential compact hexaquark configurations. Furthermore, the possible decay modes of these hexaquark states are analyzed, which could be the experimental signatures for their identification.
↳ hep-phhep-exnucl-thPRD(2026)·7 citations
07
Baryons as linked vortices in QCD matter with isospin asymmetry
Yu Hamada🇩🇪 · Muneto Nitta🇯🇵 · Zebin Qiu🇯🇵
We investigate a baryonic structure in low-energy QCD via a model-independent way using the chiral perturbation theory at the leading order, in the presence of the baryon chemical potential $μ_{B}$ , the isospin chemical potential $μ_{I}$ , and the electromagnetic coupling. For such a scenario in the chiral limit, it has been known that the neutral pion winds like in the chiral soliton lattice, confined within an Abrikosov-Nielsen-Olesen (ANO) vortex of the charged pions. This structure undergoes a drastic transformation when the pion mass is introduced, i.e., both charged and neutral pions condense in the bulk, allowing two distinct types of vortices: the charged pions constitute a local ANO-like vortex, while the neutral pion configures a global vortex which is further attached to a domain wall also known as the chiral soliton. Remarkably, the ANO vortex forms a topological linking with the closed global vortex line, when $μ_{B}$ exceeds its critical value as a function of $μ_{I}$ . The linking number has the physical meaning of the baryon number in view of the Wess-Zumino-Witten term. In this sense, the linked configuration realizes a stable Skyrmion-type solution, but innovatively without the Skyrme term. We therefore propose a novel phase of dense baryonic matter comprised of such vortices, which shall play a role in the low-energy QCD phase diagram.
↳ hep-phhep-thnucl-thJHEP(2026)·6 citations
08
Thermal quarks and Polyakov loops in two-color dense QCD
Yugo Kurebayashi🇯🇵 · Toru Kojo🇯🇵 · Daiki Suenaga🇯🇵
We study confinement and deconfinement in dense two color QCD by analyzing the dynamics of thermal quarks and gluons. The Polyakov loop is used as a probe of the relevant thermal excitations, distinguishing quark and hadron dominated regimes in dense matter. To describe the Polyakov loop, we adopt both lattice informed phenomenological models and the massive Yang Mills framework. After calibrating these models at zero density, we investigate in medium modifications of the Polyakov loops and gluon propagators at finite temperature and density. Diquark gaps control the screening at zero temperature, whereas the screening due to thermal quarks is sensitive to the Polyakov loop. Inclusion of the Polyakov loop helps to reproduce lattice data at low temperature, suggesting that thermal excitations are predominantly hadronic rather than uncorrelated quarks.
↳ hep-phhep-latnucl-thUniverse(2025)·3 citations

Affiliations

first authorsco-authorsvia INSPIRE