Nuclear Theory·nucl-th

Friday·October 3, 2025

10 papers—4 primary·6 cross-listed

05
[Submitted on 1 Oct 2025] (cross-list from hep-ph)
Hadron resonance gas is not a good model for hadronic matter in a strong magnetic field
Pasi Huovinen🇵🇱 · Michał Marczenko🇵🇱 · Michał Szymański🇵🇱 · Bithika Karmakar🇵🇱 · Pok Man Lo🇵🇱 · Chihiro Sasaki🇵🇱 · Krzysztof Redlich🇵🇱
We study the effect of magnetic field on particle yields and charge fluctuations in hadron resonance gas. We argue that the big changes in the proton yield and baryon number susceptibility are due to ill-defined description of higher-spin states, and that because of detailed balance, neutral resonances must be affected by the field too.
Comments:
4 pages, 3 figures, proceedings of Quark Matter 2025
Subjects:
High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
2510.01431 [pdf]
EPJ Web Conf.(2026)·2 citations
06
[Submitted on 1 Oct 2025] (cross-list from hep-ph)
Singly heavy tetraquark resonant states with multiple strange quarks
Xin-He Zheng🇨🇳 · Yao Ma🇨🇳 · Shi-Lin Zhu🇨🇳
We systematically investigate the S-wave singly heavy tetraquark systems containing two or three strange quarks, $Q s s ˉ s ˉ$ , $Q n s ˉ s ˉ$ and $Q s s ˉ n ˉ (Q = c, b, n = u, d)$ , within the constituent quark potential model. We solve the four-body Schrödinger equation using the Gaussian expansion method (GEM) and identify resonances via the complex scaling method (CSM). There are no bound states below the lowest two-meson thresholds. We obtain several compact resonances with $J^{P} = 0^{+}, 2^{+}$ in $Q s s ˉ s ˉ$ , and $J^{P} = 2^{+}$ in $Q n s ˉ s ˉ$ and $Q s s ˉ n ˉ$ . The pole positions are mainly distributed around $7.0 - 7.2$ GeV (bottom) and $3.7 - 3.9$ GeV (charm), with widths from a few to several tens of MeV. These resonances decay into $D_{s} η^{'}, D_{(s)}^{*} ϕ, D_{s}^{*} K^{*}$ and $D_{s}^{*} K ˉ^{*}$ (and their bottom counterparts), providing targets for future experimental searches.
Comments:
10 pages, 4 figures, 5 tables, comments are welcome
Subjects:
High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); High Energy Physics — Lattice (hep-lat); Nuclear Theory (nucl-th)
arXiv:
2510.01505 [pdf]
PRD(2026)·5 citations
07
[Submitted on 2 Oct 2025] (cross-list from hep-ph)
Particle momentum spectra, correlations, and maximum entropy principle in high-multiplicity collision events
S.V. Akkelin🇺🇦
In this paper, we utilize the maximum entropy prescription to determine a quantum state of a small collision system at the kinetic freeze-out. We derive expressions for multiplicity-selected particle momentum spectra and correlation functions by applying a fixed particle number constraint to this state. The results of our analysis can be useful for interpreting the multiplicity dependence of the particle momentum spectra and correlations in high-multiplicity $pp$ collision events at a fixed LHC energy.
Comments:
17 pages
Subjects:
High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Theory (hep-th); Nuclear Theory (nucl-th)
arXiv:
2510.01822 [pdf]
PRD(2025)·0 citations
08
[Submitted on 2 Oct 2025] (cross-list from hep-ph)
Dispersion relations: foundations
Bastian Kubis🇩🇪
We give a pedagogical introduction to the founding ideas of dispersion relations in particle physics. Starting from elementary mechanical systems, we show how the physical principle of causality is closely related to the mathematical property of analyticity, and how both are implemented in quantum mechanical scattering theory. We present a personal selection of elementary applications such as the relation between hadronic production amplitudes or form factors to scattering, and the extraction of resonance properties on unphysical Riemann sheets. More advanced topics such as Roy equations for pion--pion scattering and dispersion relations for three-body decays are briefly touched upon.
Comments:
15 pages, 4 figures; v2: typos corrected, version as published in the Encyclopedia of Particle Physics
Subjects:
High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
2510.01962 [pdf]
5 citations
09
[Submitted on 2 Oct 2025] (cross-list from hep-ph)
Light S-wave pentaquarks on the light front
Fangcheng He🇺🇸 · Edward Shuryak🇺🇸 · Wan Wu🇺🇸 · Ismail Zahed🇺🇸
We construct an explicit basis set for pentaquark states on a regular 4-simplex, that diagonalizes the Hamiltonian for light pentaquarks with confinement on the light front (LF). The ensuing eigenstates are free of the center of mass motion and satisfy exact Dirichlet boundary conditions. Hyperfine interactions in the form of color-spin or flavor-spin are shown to lift the degeneracy of the 16 pentastates, with a spectrum that compares fairly with some of the empirical nucleon excited states. The quark PDF for the light pentastates is discussed.
Comments:
14 pages, 4 figures
Subjects:
High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
2510.02076 [pdf]
PRD(2026)·3 citations
10
[Submitted on 2 Oct 2025] (cross-list from hep-ph)
Parton distributions in the shockwave formalism
Shohini Bhattacharya🇺🇸 · Chuan-Qi He🇺🇸 · Zhong-Bo Kang🇺🇸 · Diego Padilla🇺🇸 · Jani Penttala🇺🇸
In this work, we calculate a broad class of parton distributions - including parton distribution functions (PDFs), transverse-momentum-dependent distributions (TMDs), generalized parton distributions (GPDs), generalized transverse-momentum-dependent distributions (GTMDs), and diffractive parton distributions - directly from their operator-level definition in the shockwave approximation for the target nucleon. This approximation is valid in the high-energy limit of scattering, corresponding to the small- $x$ regime. The shockwave framework allows us to employ the eikonal approximation and express the parton distributions in terms of Wilson-line correlators, naturally formulated within the color-glass condensate effective field theory. We present a comprehensive set of Feynman rules for evaluating parton distributions in this limit, and demonstrate how they can be systematically applied to calculate all phenomenologically relevant leading-twist parton distributions at leading order. This work establishes a unified starting point for future studies that aim to bridge the color-glass condensate approach with the partonic description of the nucleon.
Comments:
50 pages, 11 figures; v2: added clarifying discussion, fixed typos, matches published version
Subjects:
High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
2510.02254 [pdf]
JHEP(2026)·9 citations

Affiliations

first authorsco-authorsvia INSPIRE

Hadron resonance gas is not a good model for hadronic matter in a strong magnetic field

Singly heavy tetraquark resonant states with multiple strange quarks

Particle momentum spectra, correlations, and maximum entropy principle in high-multiplicity collision events

Dispersion relations: foundations

Light S-wave pentaquarks on the light front

Parton distributions in the shockwave formalism

Affiliations