Nuclear Theory·nucl-th

Monday·October 13, 2025

10 papers—7 primary·3 cross-listed

08
[Submitted on 9 Oct 2025] (cross-list from hep-ph)
Exclusive photoproduction of light and heavy vector mesons: thresholds to very high energies
Lin Tang🇨🇳 · Hui-Yu Xing🇨🇳 · Minghui Ding🇨🇳 · Craig D. Roberts🇨🇳
A reaction model for $γ + p \to V + p$ , $V = ρ^{0}, ϕ, J / ψ, Υ$ , which exposes the quark-antiquark content of the photon in making the transition $γ \to q q ˉ + P \to V$ , where $q$ depends on $V$ , and couples the intermediate $q q ˉ$ system to the proton's valence quarks via Pomeron ( $P$ ) exchange, is used to deliver a unified description of available data -- both differential and total cross sections -- from near threshold to very high energies, $W$ , for all the $V$ -mesons. For the $Υ$ , this means $10 ≲ W / GeV ≲ 2000$ . Also provided are predictions for the power-law exponents that are empirically used to characterise the large- $W$ behaviour of the total cross sections and slope parameters characterising the near-threshold differential cross sections. Appealing to notions of vector meson dominance, the latter have been interpreted as vector-meson--proton scattering lengths. The body of results indicate that it is premature to link any $γ + p \to V + p$ data with, for instance, in-proton gluon distributions, the quantum chromodynamics trace anomaly, or pentaquark production. Further developments in reaction theory and higher precision data are required before the validity of any such links can be assessed.
Comments:
22 pages, 19 figures, 4 tables
Subjects:
High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); High Energy Physics — Lattice (hep-lat); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
arXiv:
2510.08845 [pdf]
EPJC(2026)·10 citations
09
[Submitted on 10 Oct 2025] (cross-list from hep-ph)
Semihard interactions at TeV energies
T. V. Iser🇧🇷 · E. G. S. Luna🇧🇷
We investigate the high-energy behavior of the total cross section, $σ_{tot}$ , and the ratio of the real to imaginary parts of the scattering amplitude, $ρ$ , in both proton-proton and antiproton-proton channels. Our analysis is based on a QCD-inspired model in which the rise of the cross sections is predominantly driven by semihard processes involving gluons. We address the tension between measurements from the ATLAS/ALFA and TOTEM Collaborations, showing that independent analyses of their datasets can provide statistically consistent descriptions of the overall data, even though they do not fully reproduce the central values of the $ρ$ parameter at $s = 13$ TeV. The slight discrepancy between these central values and the model's predicted values, obtained using an asymptotic dominant crossing-even elastic scattering amplitude, points to the potential presence of an odd component in the semihard amplitude at high energies.
Comments:
9 pages, 2 figures, 2 tables; v2: minor revisions, correction of a typo in Eq. (19); version published in Phys. Rev. D
Subjects:
High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Theory (nucl-th)
arXiv:
2510.08963 [pdf]
PRD(2025)·0 citations
10
[Submitted on 10 Oct 2025] (cross-list from hep-lat)
Emergence of the $π (1300)$ Resonance from Lattice QCD
Haobo Yan🇨🇳 · Maxim Mai🇨🇭 · Marco Garofalo🇩🇪 · Yuchuan Feng🇺🇸 · Michael Döring🇺🇸 · Chuan Liu🇨🇳 · Liuming Liu🇨🇳 · Ulf-G. Meißner🇩🇪 · Carsten Urbach🇩🇪
The mass of the lightest hadron in nature, the pion, is one seventh of that of the nucleon and one tenth of the mass of its first excited state, the $π (1300)$ . This enormous energy difference opens an interesting window into the confinement of quarks and the structure of the lightest hadrons. In this Letter, we provide the first calculation of resonance parameters of the $π (1300)$ from lattice quantum chromodynamics (QCD). For this purpose, recently derived state-of-the-art tools are adapted and applied both in the construction of three-hadron operators and for mapping finite-volume spectra to infinite-volume amplitudes, subsequently analytically continuing these to complex energies. For our heavy pion mass ensembles, we find a clear signal of the resonance. Making a simple assumption of vanishing pion mass dependence for the three-body force, but incorporating constraints from Chiral Perturbation Theory for all the two-body channels, enables a robust extrapolation to the physical point. Applying model averaging, we extract a pole position of $M_{π (1300)} = (1169 \pm 46) - i (6 2_{- 62}^{+ 168}) \MeV$ supporting values from phenomenology.
Comments:
20 pages, 22 figures, 2 tables. v2: version published in PRL
Subjects:
High Energy Physics — Lattice (hep-lat); High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
2510.09476 [pdf]
PRL(2026)·19 citations

Affiliations

first authorsco-authorsvia INSPIRE

Exclusive photoproduction of light and heavy vector mesons: thresholds to very high energies

Semihard interactions at TeV energies

Emergence of the π(1300) Resonance from Lattice QCD

Affiliations

Emergence of the $π (1300)$ Resonance from Lattice QCD