Nuclear Theory·nucl-th

Monday·August 19, 2024

7 papers—3 primary·4 cross-listed

01
[Submitted on 15 Aug 2024]
Quadrupole-Octupole Residual Interaction in the Proxy- $S U (3)$ Scheme
Alejandro Restrepo · José P. Valencia
The octupole deformation of atomic nuclei is a relevant research area given its implications in the nuclear structure and fundamental physics, however, inclusion of octupole degrees of freedom in the nuclear interaction has been explored little in $S U (3)$ symmetry-based models. In this article we expand the octupole operator $O_{μ}^{3}$ in the $S U (3)$ second quantization formalism and use it to formulate an octupole-octupole residual interaction $O^{3} \cdot O^{3}$ which is incorporated in Elliott's model Hamiltonian. We compute the matrix elements of this extended Hamiltonian and use them to calculate energy levels and analyse the $B (E 3; 3_{1}^{-} \to 0_{1}^{+})$ transition strength of the isotope $^{224}$ Th using the semi-microscopic algebraic quartet model (SAQM) based on the proxy- $S U (3)$ scheme.
Comments:
9 pages, 5 figures. Figures improved
Subjects:
Nuclear Theory (nucl-th)
arXiv:
2408.08386 [pdf]
PRC(2024)·1 citation
02
[Submitted on 16 Aug 2024]
Multimessenger study of baryon-charged QCD matter in heavy-ion collisions
Lipei Du🇨🇦
Multimessenger studies of heavy-ion collisions, using hadrons and electromagnetic probes, can reveal the properties of the created QCD matter from different perspectives. This study calculates the thermal dilepton invariant mass spectra and thermal photon transverse momentum spectra in Au+Au collisions at low beam energies from the Beam Energy Scan program, using a (3+1)-dimensional multistage hydrodynamic model calibrated by rapidity-dependent hadronic distributions. The effects of thermodynamic rapidity variation, baryon chemical potential, and fluid expansion on the spectra are explored. Methods for extracting temperature from photon and dilepton spectra are examined by comparison with the underlying hydrodynamic temperature. The possibility of combining photon and dilepton spectra to extract radial flow is also investigated. This study provides insights into measuring the thermodynamic properties of the created systems in heavy-ion collisions using multiple messengers through two fundamental interactions within the same framework.
Comments:
v1: 9 pages, 8 figures; v2: Minor revision, accepted by Physics Letters B
Subjects:
Nuclear Theory (nucl-th); High Energy Physics — Experiment (hep-ex); High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex)
arXiv:
2408.08501 [pdf]
PLB(2025)·13 citations
03
[Submitted on 16 Aug 2024]
Extended formalism for the study of final-state interaction in $γ p \to K^{+} π Σ$ photoproduction
Peter C. Bruns🇨🇿
We extend the formalism for the low-energy analysis of the $γ p \to K^{+} π Σ$ photoproduction reaction to include the strangeness $S = - 1$ meson-baryon p-wave final-state interaction with total angular momentum $J = \frac{3}{2}$ . As an application, and a check of our method, we evaluate contributions due to the exchange of the $Σ^{*} (1385)$ resonance as derived from a chiral Lagrangian.
Comments:
25 pages, 6 figures
Subjects:
Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph)
arXiv:
2408.08719 [pdf]
1 citation
04
[Submitted on 15 Aug 2024] (cross-list from hep-ph)
Factorized QED Contribution to Lepton-Hadron DIS
Justin Cammarota🇺🇸 · Jian-Wei Qiu🇺🇸 · Kazuhiro Watanabe🇯🇵 · Jia-Yue Zhang🇺🇸
We present the first calculation of next-to-leading order (NLO) factorized QED contributions to the short-distance hard coefficients of inclusive lepton-hadron deep inelastic scattering (DIS) in a joint QCD and QED factorization approach. We demonstrate how the joint factorization consistently factorize all perturbative collinear sensitivities of partonic scattering in both QCD and QED into corresponding universal hadron and lepton distribution functions without the need of any parameters other than the standard factorization scale. We discuss the necessary modification to DGLAP-type evolution of the parton and lepton distribution functions in this joint factorization approach. We also discuss the potential impact of this joint factorization approach on the extraction of partonic information from lepton-hadron DIS.
Comments:
6 pages, 2 figures; contributed talk to DIS2024
Subjects:
High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
arXiv:
2408.08377 [pdf]
PoS(2025)·4 citations
05
[Submitted on 15 Aug 2024] (cross-list from nucl-ex)
Coulomb Excitation of $^{80}$ Sr and the limits of the $N = Z = 40$ island of deformation
R. Russell · J. Heery · J. Henderson · R. Wadsworth · K. Kaneko · N. Shimizu · T. Mizusaki · Y. Sun · C. Andreoiu · D. W. Annen · A. A. Avaa · G. C. Ball and 24 other authors
The region of $N \approx Z \approx 40$ has long been associated with strongly deformed nuclear configurations. The presence of this strong deformation was recently confirmed through lifetime measurements in $N \approx Z$ Sr and Zr nuclei. Theoretically, however, these nuclei present a challenge due to the vast valence space required to incorporate all deformation driving interactions. Recent state-of-the-art predictions indicate a near axial prolate deformation for $N = Z$ and $N = Z + 2$ nuclei between $N = Z = 36$ and $N = Z = 40$ . In this work we investigate the shores of this island of deformation through a sub-barrier Coulomb excitation study of the $N = Z + 4$ nucleus, \textsuperscript{80}Sr. Extracting a spectroscopic quadrupole moment of $Q_{s} (2_{1}^{+}) = 0.4 5_{- 0.88}^{+ 0.83}$ ~eb, we find that \textsuperscript{80}Sr is inconsistent with significant axial prolate deformation. This indicates that the predicted region of strong prolate deformation around $N = Z = 40$ is tightly constrained to the quartet of nuclei: \textsuperscript{76,78}Sr and \textsuperscript{78,80}Zr.
Comments:
Submitted to Physics Letters B
Subjects:
Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
arXiv:
2408.08410 [pdf]
PRC(2025)·0 citations
06
[Submitted on 15 Aug 2024] (cross-list from hep-ph)
Towards quantitative precision in functional QCD I
Friederike Ihssen🇩🇪 · Jan M. Pawlowski🇩🇪 · Franz R. Sattler🇩🇪 · Nicolas Wink🇩🇪
Functional approaches are the only first principle QCD setup that allow for direct computations at finite density. Predictive power and quantitative reliability of the respective results can only be obtained within a systematic expansion scheme with controlled systematic error estimates. Here we set up such a scheme within the functional renormalisation group (fRG) approach to QCD, aiming for full apparent convergence. In the current work we test this setup, using correlation functions and observables in 2+1 flavour vacuum QCD as a natural benchmark case. While the current work includes many evolutionary improvements collected over the past two decades, we also report on three novel important developments: (i) A comprehensive systematic error analysis based on the modular nature of the fRG approach. (ii) The introduction of a fully automated computational framework, allowing for unprecedented access and improvement of the fRG approach to QCD. (iii) The inclusion of the full effective potential of the chiral order parameter. This also gives access to all-order scattering events of pions and to the full momentum dependence of correlation functions, which is a first application of the automated computational framework (ii). The results compare very well to other state-of-the-art results both from functional approaches and lattice simulations, and provide data on general multi-scattering events of pions and the sigma mode for the first time.
Subjects:
High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Theory (hep-th); Nuclear Theory (nucl-th)
arXiv:
2408.08413 [pdf]
PRD(2026)·55 citations
07
[Submitted on 16 Aug 2024] (cross-list from hep-ph)
Higgs production at NLL accuracy in the BFKL approach
Francesco Giovanni Celiberto🇪🇸 · Luigi Delle Rose🇮🇹 · Michael Fucilla🇫🇷 · Gabriele Gatto🇮🇹 · Dmitry Yu. Ivanov🇷🇺 · Mohammed M. A. Mohammed🇮🇹 · Alessandro Papa🇮🇹
Precision physics in the Higgs sector has been one of the main challenges of particle physics in the recent years. The pure fixed-order calculations entering the collinear factorization framework, which have been pushed up to next-cube-leading-order, are not able to describe the entire kinematic spectrum. In particular sectors, they have to be necessarily enhanced by all-order resummations. In the so-called semi-hard regime, large energy-type logarithms spoil the perturbative convergence of the series and must be resummed to all orders. This resummation is a core ingredient for a correct description of the inclusive hadroproduction of a forward Higgs boson in the limit of small Bjorken $x$ , as well as for a precision study of inclusive forward emissions of a Higgs boson in association with a backward identified object. A complete resummation for these processes can be achieved at the at next-to-leading logarithmic accuracy thanks to the Balitsky-Fadin-Kuraev-Lipatov approach. In the present work we present and discuss a series of recent phenomenological results within a partial next-to-leading accuracy. They include the analysis of rapidity and azimuthal-angle differential rates for Higgs plus jet and Higgs plus charm reactions in forward and ultraforward directions of rapidity at the LHC.
Comments:
5 pages, 1 figure, proceedings of the 31st International Workshop on Deep Inelastic Scattering (DIS2024), 8-12 April 2024, Grenoble, France
Subjects:
High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Theory (nucl-th)
arXiv:
2408.08731 [pdf]
PoS(2025)·6 citations

Affiliations

first authorsco-authorsvia INSPIRE

Quadrupole-Octupole Residual Interaction in the Proxy-SU(3) Scheme

Multimessenger study of baryon-charged QCD matter in heavy-ion collisions

Extended formalism for the study of final-state interaction in γp→K+πΣ photoproduction

Factorized QED Contribution to Lepton-Hadron DIS

Coulomb Excitation of 80Sr and the limits of the N=Z=40 island of deformation

Towards quantitative precision in functional QCD I

Higgs production at NLL accuracy in the BFKL approach

Affiliations

Quadrupole-Octupole Residual Interaction in the Proxy- $S U (3)$ Scheme

Extended formalism for the study of final-state interaction in $γ p \to K^{+} π Σ$ photoproduction

Coulomb Excitation of $^{80}$ Sr and the limits of the $N = Z = 40$ island of deformation