Nuclear Theory·nucl-th

Tuesday·November 11, 2025

10 papers—6 primary·4 cross-listed

07
[Submitted on 8 Nov 2025] (cross-list from hep-ph)
Accessing baryon-antibaryon generalized distribution amplitudes in $e^{\pm} γ \to e^{\pm} B B ˉ$
Jing Han🇨🇳 · Bernard Pire🇫🇷 · Qin-Tao Song🇨🇳
$γ^{*} γ \to B B ˉ$ is the golden process to access chiral-even di-baryon generalized distribution amplitudes (GDAs) as deeply virtual Compton scattering has proven to be for the generalized parton distributions. In the framework of colinear QCD factorization where the leading twist amplitude is the convolution of GDAs and a perturbatively calculable coefficient function, we study the scattering amplitude for the baryonic channels where $B$ is a spin $1/2$ baryon such as the nucleon or hyperon $Λ, Σ$ . Taking into account the interfering QED amplitude, we calculate the cross section of the $e^{\pm} γ \to e^{\pm} B B ˉ$ process that can be experimentally studied in $e^{-} e^{+}$ as well as in electron-ion facilities. We explore both the final state polarization summed case and the polarization dependent effects. Numerical estimates are presented for $e^{-} γ \to e^{-} p p ˉ$ , using motivated models for GDAs. Our results show that a first extraction of baryon-antibaryon GDAs from experimental measurements is feasible at Belle II.
Comments:
12 pages, 7 figures
Subjects:
High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Theory (nucl-th)
arXiv:
2511.05970 [pdf]
PRD(2026)·2 citations
08
[Submitted on 10 Nov 2025] (cross-list from hep-ph)
Isotone Chain Study of $p ˉ$ -atom spectroscopy and Strong Spin-orbit splittings
Kenta Yoshimura🇯🇵 · Shunsuke Yasunaga🇯🇵 · Daisuke Jido🇯🇵 · Hiroyuki Fujioka🇯🇵
Antiprotonic atoms have served as a pivotal tool for investigating the properties of baryon-baryon interactions, including their spin dependence. Examining the spin-orbit splittings induced by their strong interactions also could help clarify the nature of the $p ˉ$ -nucleus interactions and their fraction mediated by scalar and vector mesons. Although the strong spin-orbit splittings for a certain nucleus have been observed experimentally, thorough theoretical investigations have not yet been conducted. In this study, theoretical calculations based on the Dirac equation are systematically performed for nuclei along several isotone ``chains''. As a result, it is found that the magnitude of the strong spin-orbit splittings exhibits a significant dependence not only on the corresponding level shifts and widths almost linearly, but also on whether the optical potential enters as a vector or scalar potential. A simple perturbative analysis indicates that the relativistic corrections have a dominant effect the magnitude of the splittings. These results are expected to provide deeper insights into $p ˉ$ -nucleus interactions, and by extension baryon-baryon interactions, as well as into the properties of the mesons that mediate them.
Comments:
20 pages, 5 figures, 4 tables, PTEP submitted ver
Subjects:
High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
2511.07169 [pdf]
PTEP(2026)·0 citations
09
[Submitted on 10 Nov 2025] (cross-list from hep-ph)
Phases and properties of color superconductors
Andreas Schmitt🇬🇧
Cold and dense matter is expected to be in a color-superconducting state. Here we review two calculations, relevant for fundamental properties and applications of color superconductivity, respectively: the weak-coupling QCD calculation of the fermionic energy gap together with the magnetic screening masses of the gauge bosons, and the calculation of bulk viscosity from a non-leptonic electroweak process. These calculations are supplemented by a discussion of color superconductors with mismatched Fermi momenta, and they are embedded in the context of the state of the art by giving an overview of previous and ongoing work and future directions.
Comments:
40 pages, 9 figures, prepared for "Encyclopedia of Nuclear Physics"
Subjects:
High Energy Physics — Phenomenology (hep-ph); Superconductivity (cond-mat.supr-con); Nuclear Theory (nucl-th)
arXiv:
2511.07319 [pdf]
9 citations
10
[Submitted on 10 Nov 2025] (cross-list from nucl-ex)
Experimental review on the chiral magnetic effect in relativistic heavy ion collisions
Wei Li🇺🇸 · Qiye Shou🇨🇳 · Fuqiang Wang🇺🇸
The chiral magnetic effect (CME) refers to a predicted phenomena in quantum chromodynamics that manifests as a charge separation along an external magnetic field, driven by an imbalance of quark chirality. Searches for the CME has been carried out by azimuthal particle correlations in relativistic heavy ion collisions where such a chirality imbalance is anticipated and a strong magnetic field is created in the initial stage. No conclusive experimental evidence on the CME has been established so far because of large background contributions to azimuthal correlation observables. We review the status of the experimental search for the CME, covering the observables used, the techniques to mitigate backgrounds, and the strengths and limitations of various experimental approaches, and outline a future prospect of the CME search in high-energy nuclear collisions.
Comments:
29 pages, 12 figures, 2 tables. Invited review for European Physical Journal Special Topics "Exploring Dense Nuclear Matter. Guest editors: Subhasis Chattopadhyay, Peter Senger"
Subjects:
Nuclear Experiment (nucl-ex); High Energy Physics — Experiment (hep-ex); High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
2511.07358 [pdf]
Eur. Phys. J. Spec. Top. (2026)·6 citations

Affiliations

first authorsco-authorsvia INSPIRE

Accessing baryon-antibaryon generalized distribution amplitudes in e±γ→e±BBˉ

Isotone Chain Study of pˉ​-atom spectroscopy and Strong Spin-orbit splittings

Phases and properties of color superconductors

Experimental review on the chiral magnetic effect in relativistic heavy ion collisions

Affiliations

Accessing baryon-antibaryon generalized distribution amplitudes in $e^{\pm} γ \to e^{\pm} B B ˉ$

Isotone Chain Study of $p ˉ$ -atom spectroscopy and Strong Spin-orbit splittings