Nuclear Theory·nucl-th

Friday·March 14, 2025

16 papers—8 primary·8 cross-listed

09
High-energy Coulomb scattering of spatially extended particles
M. L. Nekrasov🇷🇺
We analyze pure Coulomb high-energy elastic scattering of charged particles (hadrons or nuclei), discarding their strong interactions. We distinguish three scattering modes, determined by the magnitude of the momentum transfer, in which particles behave as point-like, structureless extended, and structured composite objects. The results are compared in the potential and QFT approaches of the eikonal model. In the case of proton Coulomb scattering at the LHC the difference between these two approaches is significant. This indicates the unsuitability of the potential approach. However, in the case of Coulomb scattering of heavy nuclei, the leading one is the optical approximation, which formally reproduces the prescription of the potential approach.
↳ hep-phhep-thnucl-thNPA(2025)·1 citation
10
Dominance of gluonic scale anomaly in confining pressure inside nucleon and D-term
Daisuke Fujii🇯🇵 · Mamiya Kawaguchi🇨🇳 · Mitsuru Tanaka🇯🇵
We explore the confining pressure inside the nucleon and the related gravitational form factor referred to as the D-term, using the skyrmion approach based on the scale-invariant chiral perturbation theory, where the skyrmion is described as the nucleon and a scalar meson couples to the scale anomaly through the low energy theorem. Within this model framework, the current quark mass and gluonic quantum contributions to the scale anomaly can be described by the pion and scalar meson masses, respectively, through matching with the underlying QCD. By considering the decomposition of the energy momentum tensor of nucleon, we examine the role of the scale anomaly contributions in the pressure inside the nucleon. As a result, the gluonic scale anomaly is found to dominate the confining pressure. Compared to the result based on the conventional chiral perturbation theory in the chiral limit, our result for the total pressure is capable of qualitatively improving the alignment with lattice QCD observations. Moreover, the pressure from the gluonic scale anomaly is widely distributed in position space, leading to its substantial contribution to the D-term.
↳ hep-phhep-lathep-thnucl-thPLB(2025)·25 citations
11
Improved Honeycomb and Hyperhoneycomb Lattice Hamiltonians for Quantum Simulations of Non-Abelian Gauge Theories
Marc Illa🇺🇸 · Martin J. Savage🇺🇸 · Xiaojun Yao🇺🇸
Improved Kogut-Susskind Hamiltonians for quantum simulations of non-Abelian Yang-Mills gauge theories are developed for honeycomb (2+1D) and hyperhoneycomb (3+1D) spatial tessellations. This is motivated by the desire to identify lattices for quantum simulations that involve only 3-link vertices among the gauge field group spaces in order to reduce the complexity in applications of the plaquette operator. For the honeycomb lattice, we derive a classically $O (b^{2})$ -improved Hamiltonian, with $b$ being the lattice spacing. Tadpole improvement via the mean-field value of the plaquette operator is used to provide the corresponding quantum improvements. We have identified the (non-chiral) hyperhoneycomb as a candidate spatial tessellation for 3+1D quantum simulations of gauge theories, and determined the associated $O (b)$ -improved Hamiltonian.
↳ hep-latnucl-thquant-phPRD(2025)·23 citations
12
Signs of Non-Monotonic Finite-Volume Corrections to $g_{A}$
Zack B. Hall🇺🇸 · Dimitra A. Pefkou🇺🇸 · Aaron S. Meyer🇺🇸 · Thomas R. Richardson🇺🇸 · Raúl A. Briceño🇺🇸 · M. A. Clark🇺🇸 · Martin Hoferichter🇨🇭 · Emanuele Mereghetti🇺🇸 · Henry Monge-Camacho🇺🇸 · Colin Morningstar🇺🇸 · Amy Nicholson🇺🇸 · Pavlos Vranas🇺🇸 · André Walker-Loud🇺🇸
We study finite-volume (FV) corrections to determinations of $g_{A}$ via lattice quantum chromodynamics (QCD) using analytic results and numerical analysis. We observe that $S U (2)$ Heavy Baryon Chiral Perturbation Theory does not provide an unambiguous prediction for the sign of the FV correction, which is not surprising when one also considers large- $N_{c}$ constraints on the axial couplings. We further show that non-monotonic FV corrections are naturally allowed when one considers either including explicit $Δ$ -resonance degrees of freedom or one works to higher orders in the chiral expansion. We investigate the potential impact of these FV corrections with a precision study of $g_{A}$ using models of FV corrections that are monotonic and non-monotonic. Using lattice QCD data that is approximately at the 1% level of precision, we do not see significant evidence of non-monotonic corrections. Looking forward to the next phase of lattice QCD calculations, we estimate that calculations that are between the 0.1%-1%-level of precision may be sensitive to these FV artifacts. Finally, we present an update of the CalLat prediction of $g_{A}$ in the isospin limit with sub-percent precision, $g_{A}^{QCD} = 1.2674 (96)$ .
↳ hep-lathep-phnucl-exnucl-thPRC(2026)·21 citations
13
Nucleon resonance structure to 2 GeV and the nature of the Roper
Shiryo Owa🇦🇺 · Derek B. Leinweber🇦🇺 · Anthony W. Thomas🇦🇺
The study of the spectrum of excited states of the nucleon is vital to our understanding of how QCD is realized in the baryon spectrum. Using a simultaneous analysis of the pion nucleon scattering data up to 2 GeV as well as the results of lattice QCD calculations, we obtain new insight into the nature of the Roper resonance as well as the excited states around 1.9 GeV.
↳ hep-phhep-latnucl-thPRD(2025)·12 citations
14
Exploring the multiplicity dependence of the flavor hierarchy for hadron productions in high energy pp collisions
Aogui Zhang · Xinye Peng · Liang Zheng
In this work, we perform a systematic study on the multiplicity dependence of hadron productions at mid-rapidity ( $∣ y ∣ < 0.5$ ), ranging from the light to the charm sector in pp collisions at $s = 13$ TeV. This study utilizes a multi-phase transport model (AMPT) coupled with PYTHIA8 initial conditions. We have investigated the baryon to meson ratios as well as the strange to non-strange meson ratios varying with the charged particle density. By tuning the coalescence parameters, the AMPT model provides a reasonable description to the experimental data for inclusive productions of both light and charm hadrons, comparable to the string fragmentation model calculations with color reconnection effects. Additionally, we have analyzed the relative production of hadrons by examining self-normalized particle ratios as a function of the charged hadron density. Our findings suggest that parton evolution effects and the coalescence hadronization process in AMPT model lead to a strong flavor hierarchy in the multiplicity dependence of the baryon to meson ratio. Furthermore, our investigation on the $p_{T}$ differential double ratio of baryon to meson fraction between high and low multiplicity events indicates distinct modifications to the flavor associated baryon to meson ratio $p_{T}$ shape in high multiplicity events when comparing the coalescence hadronization model to the color reconnection model. These observations highlight the importance of understanding the hadronization process in high-energy proton-proton collisions through a comprehensive multiplicity dependent multi-flavor analysis.
↳ hep-phnucl-thNucl.Sci.Tech.(2025)·5 citations
15
Hadron physics with functional methods
Gernot Eichmann🇦🇹
We give a pedagogical introduction to hadron spectroscopy and structure studies using functional methods. We explain the basic features of Dyson-Schwinger, Bethe-Salpeter and Faddeev equations, which are employed to calculate the spectra of mesons, baryons and four-quark states. We discuss dynamical mass generation as a consequence of the spontaneous breaking of chiral symmetry, which is intertwined with the emergence of the light pions as Goldstone bosons of QCD. We highlight the importance of diquark correlations in the baryon sector, while for four-quark states such as the light scalar mesons and heavy exotics the dominant two-body clusters are typically mesons. We conclude with a brief discussion of hadron matrix elements like electromagnetic form factors and how vector-meson dominance is an automatic outcome of functional equations.
↳ hep-phnucl-th23 citations
16
Chiral Magnetic Effect enhancement at lower collision energies
Sebastian Grieninger🇺🇸 · Sergio Morales-Tejera🇷🇴 · Pau G. Romeu🇪🇸
We extend previous holographic studies of the Chiral Magnetic Effect (CME) by incorporating a time-dependent magnetic field. Various magnetic field profiles proposed in the literature are implemented, and their impact on the CME signal is analyzed in both static and expanding backgrounds. Interestingly, the integrated chiral magnetic current can exhibit a non-monotonic dependence on the collision energy. Our results suggest that the CME signal is enhanced at collision energies below $s = 200$ GeV. In addition, we derive a quasi-equilibrium formula for the chiral magnetic effect in the expanding background that is valid at late times.
↳ hep-phhep-thnucl-thPRD(2025)·3 citations

Affiliations

first authorsco-authorsvia INSPIRE