Nuclear Theory·nucl-th

Thursday·July 2, 2026

14 papers—8 primary·6 cross-listed

09
[Submitted on 30 Jun 2026] (cross-list from hep-ph)
Putting Jet Substructure on Track(s)
Kyle Lee🇺🇸 · Ian Moult🇺🇸 · Wouter J. Waalewijn🇳🇱
One of the main advances in analysis strategies at the Large Hadron Collider (LHC) has been the ability to study the detailed structure of energy flow within high transverse momentum jets, a field referred to as jet substructure. Jet substructure has provided new ways to search for new physics, measure Standard Model parameters, and study the dynamics of the strong nuclear force. To push to the next level of precision, and to make measurements of increasingly subtle correlations, requires exquisite angular resolution achieved through the use of tracking information. In this paper we leverage recent progress in our understanding of factorization theorems and renormalization group techniques to present the first complete calculations of jet substructure observables at the LHC on tracks. We compute projected energy correlators up to four points at next-to-leading collinear logarithmic accuracy, matching the state of the art for jet substructure observables, but extending to tracks. This marks a significant step in enhancing the collider physics program, enabling precise and systematically improvable comparisons between experimental measurements and theoretical calculations, made possible by the exceptional angular resolution of tracking.
Comments:
5 pages, 5 figures
Subjects:
High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Theory (nucl-th)
arXiv:
2607.00087 [pdf]
3 citations
10
[Submitted on 1 Jul 2026] (cross-list from hep-ph)
Effective Color Dipole Approach to Color Transparency in $ρ^{0}$ Electroproduction
Tae Keun Choi🇰🇷 · Kook-Jin Kong🇰🇷 · Byung-Geel Yu🇰🇷
We investigate nuclear transparency in exclusive $ρ^{0}$ electroproduction on $^{12}$ C and $^{56}$ Fe nuclei within a multi-channel final-state interaction (FSI) framework that explicitly incorporates the kinematic decay length effect (DLE) arising from the short-lived $ρ^{0} \to π^{+} π^{-}$ decay. The purely kinematic and nuclear mechanisms prove insufficient to account for the CLAS data: the DLE alone cannot generate the observed $Q^{2}$ -dependent enhancement, and the inclusion of nuclear shadowing further deepens the disagreement, so that a compensating reduction of the in-medium attenuation -- the hallmark of color transparency (CT) -- is required. To incorporate the color dynamics of the initially compact $q q ˉ$ configuration, we replace the empirical Quantum Diffusion Model (QDM) ansatz for the initial interaction cross section $σ_{h} (Q^{2})$ of the point-like configuration (PLC) by an effective Color Dipole Model (CDM) boundary condition, evaluated through a normalized dipole-weighted $γ^{*} \to ρ^{0}$ transition overlap. Combined with the standard linear QDM transport at an effective in-medium expansion scale $Δ m^{2} = 0.3$ ~GeV $^{2}$ , the CDM boundary condition reproduces both the magnitude and the $Q^{2}$ dependence of the data for both targets. A $χ^{2}$ analysis quantifies the pronounced separation between the non-CT and CT-based descriptions and thereby supports the onset of color transparency in the $ρ^{0}$ channel beyond what kinematic decay-length effects can accommodate.
Comments:
7 pages, 4 figures
Subjects:
High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
2607.00566 [pdf]
0 citations
11
[Submitted on 1 Jul 2026] (cross-list from hep-ph)
Gluon radiation from a QCD antenna with realistic parton-medium interactions
Carlota Andrés🇫🇷 · Liliana Apolinário🇵🇹 · Néstor Armesto🇪🇸 · André Cordeiro🇵🇹 · Fabio Domínguez🇫🇷 · Pablo Guerrero-Rodríguez🇵🇹 · José Guilherme Milhano🇵🇹
The spectrum of coherent gluon radiation from a quark-antiquark pair undergoing multiple scatterings within a colored medium is central for understanding in-medium parton cascades. However, current efforts are constrained by reliance on a number of approximations, such as the harmonic oscillator approximation, that are only valid within limited regions of phase space. In this paper, we circumvent this problem by expressing the full in-medium gluon emission spectrum as a set of differential equations that can be solved numerically. This formalism, previously applied to the case of medium-induced radiation off a single color charge, allows to resum medium interactions to all orders while employing realistic scattering models. The resulting angle and energy distributions of emitted gluons serve to illustrate the breakdown of color coherence across the entire accessible phase-space, and constitute a definite step towards a higher-precision description of jet observables.
Comments:
34 pages, 5 figures, references updated
Subjects:
High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
2607.00629 [pdf]
0 citations
12
[Submitted on 1 Jul 2026] (cross-list from physics.hist-ph)
In Memoriam: Igal Talmi (1925-2026)
Amiram Leviatan · Avraham Gal
A brief obituary of Igal Talmi (1925-2026) focusing on his scientific heritage. Published in Nuclear Physics News 36 (2026) 39-40.
Comments:
2 pages, 1 figure
Subjects:
History and Philosophy of Physics (physics.hist-ph); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
arXiv:
2607.00787 [pdf]
Nucl.Phys.News(2026)·0 citations
13
[Submitted on 1 Jul 2026] (cross-list from nucl-ex)
Nuclear electromagnetic moments by spin-precession methods
Georgi Georgiev🇫🇷 · Dimiter L. Balabanski🇷🇴 · Andrew E.Stuchbery🇦🇺 · Hideki Ueno🇯🇵
Nuclear moment studies carried out with spin-precession methods at and after the turn of the millennium are critically assessed. A period of about 30 years is covered, during which much of} the focus of nuclear structure research shifted from high-spin physics to studies of neutron-rich exotic nuclei. The formalism for the extraction of nuclear moments is described. The $β$ -nuclear magnetic resonance/nuclear quadrupole resonance ( $β$ -NMR/NQR), the time-dependent perturbed angular distribution (TDPAD), the transient field, the recoil-in-vacuum (RIV), and the tilted-foils methods for measurements of nuclear magnetic dipole and electric quadrupole moments are described in detail, as well as the requirements for their application in studies of exotic nuclei. The impact of nuclear-moment measurements on the understanding of key topics of nuclear structure research is discussed. {Key results on short-lived states, mainly from transient-field measurements, are reviewed. Included are comparisons with large-basis shell model calculations, discussions on the nature of weakly-collective nuclei, insights into emerging collectivity away from closed shells, and electromagnetic properties of odd- $A$ rotors.} In the field of high-spin physics, research related to high-spin yrast and $K$ isomers, superdeformation, magnetic, anti-magnetic, and chiral rotation is covered. In neutron-rich exotic nuclei, studies related to the $N = 20$ , $N = 28$ and $N = 40$ ``islands of inversion'', the structure of nuclei around $^{68 - 78}$ Ni and $^{132}$ Sn, and in the $A \sim 100$ mass region are discussed.
Comments:
Review paper, 336 pages, 71 figures, 957 references
Subjects:
Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
arXiv:
2607.00900 [pdf]
1 citation
14
[Submitted on 1 Jul 2026] (cross-list from hep-ph)
Shedding light on the nature of $ϕ (2170)$ with the parton and hadron cascade model PACIAE
Jian Cao🇨🇳 · Wen-Chao Zhang🇨🇳 · Bo Feng🇨🇳 · Ya-Hui Hou🇨🇳 · An-Ke Lei🇨🇳 · Zhi-Lei She🇨🇳 · Hua Zheng🇨🇳 · Li-Lin Zhu🇨🇳 · Dai-Mei Zhou🇨🇳 · Yu-Liang Yan🇨🇳 · Ben-Hao Sa🇨🇳
The nature of $ϕ (2170)$ remains open. We simulate its production in $e^{+} e^{-}$ collisions at $s = 4.95$ GeV using PACIAE 4.0, which sequentially generates the final partonic state (FPS) and the final hadronic state (FHS). While previous studies have interpreted $ϕ (2170)$ as an $ss s ˉ s ˉ$ or a $u u ˉ s s ˉ$ state, the $U (1)$ anomaly coupling allows non-strange quarks to couple to a vector $s s ˉ$ component via soft-gluon interactions. This motivates us to also explore the $d d ˉ s s ˉ$ tetraquark configuration. In addition, we consider $ϕ (2170)$ as an excited strangeonium state, an $s s ˉ g$ hybrid state, a $Λ ˉ Λ$ bound state, and a $ϕ K^{+} K^{-}$ resonance state. The strangeonium, hybrid, and tetraquark candidates are formed by coalescing their constituent partons in the FPS using the dynamically constrained phase-space coalescence model. The $Λ ˉ Λ$ and $ϕ K^{+} K^{-}$ states are produced via recombination of their constituent hadrons in the FHS. We calculate the orbital angular momentum quantum number of each candidate in its rest frame and perform spectral classification. Given $J^{P C} = 1^{--}$ , $ϕ (2170)$ can be interpreted as a $D$ -wave $s s ˉ$ , a $P$ -wave $s s ˉ g$ , a $P$ -wave $u u ˉ s s ˉ / d d ˉ s s ˉ / ss s ˉ s ˉ$ , an $S$ -wave $Λ ˉ Λ$ , or an $S$ -wave $ϕ K^{+} K^{-}$ state. The yields of the $D$ -wave $s s ˉ$ , $P$ -wave $s s ˉ g$ , $u u ˉ s s ˉ$ and $d d ˉ s s ˉ$ states are of order $1 0^{- 4}$ ; those for the $S$ -wave $Λ ˉ Λ$ and $ϕ K^{+} K^{-}$ states are of order $1 0^{- 5}$ ; while the $P$ -wave $ss s ˉ s ˉ$ yield is of order $1 0^{- 6}$ . Moreover, significant discrepancies are observed in the rapidity distributions and the $p_{T}$ spectra among the various candidates. These discrepancies could serve as valuable criteria for unraveling the nature of $ϕ (2170)$ .
Comments:
8 pages, 3 tables, 2 figures. Some modifications are made in section II
Subjects:
High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
2607.01075 [pdf]
0 citations

Affiliations

first authorsco-authorsvia INSPIRE

Putting Jet Substructure on Track(s)

Effective Color Dipole Approach to Color Transparency in ρ0 Electroproduction

Gluon radiation from a QCD antenna with realistic parton-medium interactions

In Memoriam: Igal Talmi (1925-2026)

Nuclear electromagnetic moments by spin-precession methods

Shedding light on the nature of ϕ(2170) with the parton and hadron cascade model PACIAE

Affiliations

Effective Color Dipole Approach to Color Transparency in $ρ^{0}$ Electroproduction

Shedding light on the nature of $ϕ (2170)$ with the parton and hadron cascade model PACIAE