Nuclear Theory·nucl-th

Monday·August 24, 2026

11 papers—6 primary·5 cross-listed

07
[Submitted on 20 Aug 2026] (cross-list from hep-ph)
Poles in $π N$ scattering from forward dispersion relations and revised total cross-section data
José Ramón Peláez🇪🇸 · Pablo Rabán🇪🇸 · Jacobo Ruiz de Elvira🇪🇸
We present a model-independent calculation of $π N$ forward dispersion relations and their analytic continuation to the complex plane, using a revised set of $π^{\pm} p$ total cross-section data up to 3 GeV, and Regge asymptotics above. Up to that energy, we find four stable poles for each isospin combination. The lightest pole in the $I = 3/2$ channel corresponds to the $Δ (1232)$ resonance, while the lightest in the $I = 1/2$ channel corresponds to the Roper resonance, even though the latter is imperceptible in the data. We extract their pole parameters and the parameter difference between the $Δ^{0}$ and $Δ^{++}$ , without relying on a partial-wave analysis. The remaining poles cannot be identified with a single resonance each. They are not artifacts but the combined effect of multiple resonances unresolved by total cross-section data alone. Finally, we write sum rules relating the residues of these constituent resonances to the residues of the poles extracted from the dispersive representation.
Comments:
17 pages, 8 figures
Subjects:
High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); High Energy Physics — Lattice (hep-lat); Nuclear Theory (nucl-th)
arXiv:
2608.20458 [pdf]
0 citations
08
[Submitted on 20 Aug 2026] (cross-list from hep-ph)
Muon Capture on the Proton with Heavy-Light Currents
Evan Combes🇺🇸 · Emanuele Mereghetti🇺🇸 · Lucas Platter🇺🇸
We construct a non-relativistic Lagrangian that describes muon-proton electroweak interactions. We determine the leading order coefficients by matching onto the theory with non-relativistic nucleons and relativistic leptons. The most impactful $O (α)$ corrections to those coefficients are determined by matching the non-relativistic amplitudes for capture of a free muon on a proton to the corresponding relativistic one. We use our non-relativistic effective field theory framework to calculate the capture rate in muonic hydrogen, thereby including radiative corrections of order $α$ and up to order $1/ m_{μ}$ . Using results for the Fermi coupling previously derived in EFT, we obtain singlet and triplet capture rates of $Γ (^{1} S_{0}) = 724.07 \pm 5.45 s^{- 1}$ and $Γ (^{3} S_{1}) = 11.55 \pm 0.18 s^{- 1}$ , respectively.
Comments:
11 pages, 3 figures
Subjects:
High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
2608.20468 [pdf]
0 citations
09
[Submitted on 21 Aug 2026] (cross-list from astro-ph.HE)
Hyperonic compact stars with vector portal dark matter
Prafulla K. Panda🇮🇳 · Deepak Kumar🇵🇹 · Hiranmaya Mishra🇮🇳 · Sudhanwa Patra🇮🇳
The appearance of hyperons in the core of neutron stars generally softens the equation of state (EOS), posing a longstanding challenge to the existence of observed two-solar-mass compact stars. We investigate whether repulsive interactions mediated by a dark-sector vector portal can provide an additional source of high-density pressure and thereby modify the structure of hyperonic compact stars. The baryonic sector is described within the modified quark-meson coupling (MQMC) model, in which the octet baryons are treated as confined relativistic constituent-quark systems interacting self-consistently through the $σ$ , $ω$ , and $ρ$ fields within a mean field approximation. The dark sector consists of a fermionic dark matter coupled to baryonic matter through a neutral vector mediator $Z^{'}$ , generating an additional repulsive contribution to the dense-matter EOS. We investigate the resulting equation of state, mass--radius relation, tidal deformability, and moment of inertia. The resulting mass--radius relations satisfy the observational bounds from massive pulsars, including PSR J0740 + 6620, with maximum neutron star masses reaching approximately $2 M_{⊙}$ . The resulting changes in tidal and rotational observables provide additional avenues for testing the dark-sector interaction through multimessenger observations.
Comments:
18 pages, 5 figures, regular article
Subjects:
High Energy Astrophysical Phenomena (astro-ph.HE); High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
2608.20921 [pdf]
0 citations
10
[Submitted on 21 Aug 2026] (cross-list from hep-ph)
Unraveling QCD dynamics with heavy quark energy correlators
Ivan Vitev🇺🇸
Heavy-flavor jets and their substructure provide a unique window into the role of quark mass on QCD radiation and its modification in nuclear matter. In this work, we investigate heavy-quark energy-energy correlators (EECs) that are explicitly sensitive to mass effects, focusing on angular distributions, energy flow, and the dead-cone effect. We demonstrate how the finite mass of charm and bottom quarks reshapes the intra-jet radiation pattern, leading to characteristic suppression at small angles and measurable deviations from massless jet expectations. Using effective field theory analysis, we extend the calculation of these observables to reactions with nuclei to show that medium-induced radiation competes with vacuum mass suppression, resulting in a nontrivial modification of jet substructure. Specifically, we identify regimes where EECs are dominated by the heavy quark mass, leading to qualitatively and quantitatively different behavior of this observable in QCD matter. We discuss the charm and bottom jet energy-energy correlators modification in reactions with nuclei, and further demonstrate how the formalism can be tested in small collision system at current facilities.
Comments:
DIS2026 Proceedings, 7 pages, 2 figures
Subjects:
High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
2608.21145 [pdf]
0 citations
11
[Submitted on 21 Aug 2026] (cross-list from hep-lat)
Exponential-in- $N_{c}^{2}$ cost reduction of product-formula-based quantum simulations of quantum chromodynamics
Zohreh Davoudi🇺🇸 · Jesse R. Stryker🇺🇸
Quantum algorithms for simulating quantum chromodynamics (QCD) have matured steadily since the pioneering work of Byrnes and Yamamoto [PRA 73, 022328 (2006)]. The most popular strategies for Hamiltonian simulation involve product-formula decompositions. However, the application of product-formula methods to SU( $N_{c}$ ) lattice gauge theories by Byrnes and Yamamoto leads to $O (Λ^{8 (N_{c}^{2} - 1)})$ gate complexity per Trotter step, where $Λ$ is the bosonic cutoff in the electric (i.e., irreducible-representation) basis. A seminal work by Kan and Nam [arXiv:2107.12769 (2021)] significantly improves over such an undesirable cost and reports an $O (Λ polylog (Λ))$ scaling, yet it still calls for an unrealistically large number of quantum gates. Here, we illuminate one of the reasons behind this high cost estimate and show that a factor of size $O (2^{4 (N_{c}^{2} - 1)})$ can be removed from the per-Trotter-step cost estimate by Kan and Nam. We specifically show that, by using methods developed in our past works [PRD 112, 014508 (2025); Quantum 7, 1213 (2023)], exponentiated-Hamiltonian decomposition---a necessary step in the application of product-formula algorithms---can be performed far more efficiently than previously thought. Our method reduces the T-gate cost estimate of QCD simulations using a second-order product formula by a factor of nearly $1 0^{14}$ , independent of simulation parameters and sizes. Focusing on simulations in the electric basis, we further contrast our results with other methods: the local-multiplet basis approach of Ciavarella, Klco, and Savage [PRD 103, 094501 (2021)] and the near-optimal algorithm of Rhodes, Kreshchuk, and Pathak [PRX Quantum 5, 040347 (2024)]. This work highlights the importance of continued algorithmic improvement to bringing the quantum-simulation cost of QCD within reach of realistic quantum computers.
Comments:
16 pages + bibliography, 3 figures
Subjects:
High Energy Physics — Lattice (hep-lat); High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th); Quantum Physics (quant-ph)
arXiv:
2608.21258 [pdf]
0 citations

Affiliations

first authorsco-authorsvia INSPIRE

Poles in πN scattering from forward dispersion relations and revised total cross-section data

Muon Capture on the Proton with Heavy-Light Currents

Hyperonic compact stars with vector portal dark matter

Unraveling QCD dynamics with heavy quark energy correlators

Exponential-in-Nc2​ cost reduction of product-formula-based quantum simulations of quantum chromodynamics

Affiliations

Poles in $π N$ scattering from forward dispersion relations and revised total cross-section data

Exponential-in- $N_{c}^{2}$ cost reduction of product-formula-based quantum simulations of quantum chromodynamics