Nuclear Theory·nucl-th

Friday·April 11, 2025

10 papers—5 primary·5 cross-listed

06
[Submitted on 9 Apr 2025] (cross-list from hep-ph)
Scattering and gluon emission of physical quarks in a SU(3) colored field
Meijian Li🇪🇸 · Tuomas Lappi🇫🇮 · Xingbo Zhao🇨🇳 · Carlos A. Salgado🇪🇸
We study the scattering of the gluon-dressed physical quarks, defined as the eigenstates of the vacuum QCD Hamiltonian, off a colored medium. We solve the wavefunction of the physical quark state by diagonalizing the QCD Hamiltonian in vacuum in a $∣ q ⟩ + ∣ q g ⟩$ Fock space, with implementing the sector-dependent mass renormalization scheme. We then perform numerical simulations of the real-time quantum state evolution of the initially dressed quark state at various medium densities. The results are compared with those of an initially bare or off-shell quark states. With the obtained light-front wavefunction of the evolved state, we extract the quark jet transverse momentum broadening, the quenching parameter, the cross section, the gluon emission rate, and the evolution of the invariant mass. The scenario considered is relevant for high energy scattering processes, where the quark originates from far outside the color field describing the scattering target. This investigation on dressed quarks complements our earlier studies of the single quark scattering in the $∣ q ⟩$ Fock space, and of the bare quark scattering in the $∣ q ⟩ + ∣ q g ⟩$ Fock space, providing a novel systematic description of quark scattering process using a non-perturbative formalism.
Subjects:
High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
2504.07162 [pdf]
PRD(2025)·7 citations
07
[Submitted on 10 Apr 2025] (cross-list from hep-ph)
Empirical Determination of the Kaon Distribution Amplitude
Lei Chang🇨🇳 · Yu-Bin Liu🇨🇳 · Khépani Raya🇪🇸 · M. Atif Sultan🇨🇳
We propose a data-driven approach to extract the Kaon leading-twist distribution amplitude (DA) from empirical information on the ratio of the neutral-to-charged kaon electromagnetic form factors, $R_{K}$ . Our study employs a two-parameter representation of the DA at $ζ = 2$ GeV, designed to capture the expected broadening and asymmetry of the distribution, as well as the soft endpoint behavior predicted by quantum chromodynamics (QCD). Our leading-order analysis of the latest experimental measurements of $R_{K}$ reveals that the extracted DA exhibits a somewhat significant skewness, with the first symmetric moment approximately $⟨ 1 - 2 x ⟩_{K} = 0.082 (7)$ . On the other hand, the brodaness and general shape of the produced distributions show a reasonable consistency with contemporaty lattice and continuum QCD analyses. These findings highlight the importance of accurately determining the profile of the DA, especially the skewness and its relation to $S U_{F} (3)$ flavor symmetry breaking, as well as the inclusion of higher-order effects in the hard-scattering kernels for analyzing data at experimentally accessible scales.
Comments:
6 pages, 3 figures
Subjects:
High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Lattice (hep-lat); Nuclear Theory (nucl-th)
arXiv:
2504.07372 [pdf]
PRD(2025)·3 citations
08
[Submitted on 10 Apr 2025] (cross-list from hep-ph)
$C$ and $C P$ violation in effective field theories and applications to $η$ -meson decays
Bastian Kubis🇩🇪
The quest for sources of the simultaneous violation of $C$ and $C P$ symmetry was popular in the 1960s, but has since been neglected for a long time. We revisit the operators that break $C$ and $C P$ for flavor-conserving transitions in both the Standard Model effective field theory and the low-energy effective field theory, which subsequently can be matched to light-meson physics using chiral perturbation theory. As applications, we discuss in particular the $C$ -odd Dalitz plot asymmetries in $η \to 3 π$ , but also decays with dilepton pairs in the final state, such as long-distance contributions to the rare semileptonic decays $η \to π^{0} ℓ^{+} ℓ^{-}$ as well as asymmetries in $η^{(')} \to γ ℓ^{+} ℓ^{-}$ and $η^{(')} \to π^{+} π^{-} ℓ^{+} ℓ^{-}$ .
Comments:
15 pages, 4 figures; plenary contribution at the 11th International Workshop on Chiral Dynamics (CD2024)
Subjects:
High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Theory (nucl-th)
arXiv:
2504.07539 [pdf]
PoS(2026)·0 citations
09
[Submitted on 10 Apr 2025] (cross-list from gr-qc)
Tidal heating in binary inspiral of strange quark stars
Suprovo Ghosh🇮🇳 · José Luis Hernández🇪🇸 · Bikram Keshari Pradhan🇮🇳 · Cristina Manuel🇪🇸 · Debarati Chatterjee🇮🇳 · Laura Tolos🇪🇸
We investigate tidal heating associated with the binary inspiral of strange quark stars and its impact on the resulting gravitational wave signal. Tidal heating during the merger of neutron stars composed of nuclear matter may be considered negligible, but it has been demonstrated recently that the presence of hyperons at high densities could significantly enhance the dissipation during inspiral. In this work, we evaluate the bulk viscosity arising from non-leptonic weak processes involving quarks and show that it can be several orders of magnitude higher than the viscosity of nuclear matter at temperatures relevant to the inspiral phase of the merger of strange stars. We model strange quark matter in the normal phase using a non-ideal bag model including electrons and ensure compatibility with astrophysical constraints. By analysing equal-mass binary systems with component masses ranging from 1.4 to 1.8 $M_{⊙}$ , we find that temperatures close to 0.1 MeV are reached by the end of the inspiral phase. We also estimate the effect on the gravitational waveform and conclude that the additional phase shift could range from $0.1$ to $0.5$ radians for strange quark masses of 200 MeV, making it potentially detectable by next-generation gravitational wave detectors. Given that tidal heating from hyperons is dominant only for very massive neutron stars having masses 1.8 to 2.0 $M_{⊙}$ , a successful detection of this phase shift during the inspiral of binary systems with relatively low masses of 1.4 to 1.6 $M_{⊙}$ could be a smoking gun signature for the existence of strange quark stars.
Comments:
14 pages, 6 figures, 3 tables, Matches accepted version in PRD
Subjects:
General Relativity and Quantum Cosmology (gr-qc); High Energy Astrophysical Phenomena (astro-ph.HE); Nuclear Theory (nucl-th)
arXiv:
2504.07659 [pdf]
PRD(2025)·13 citations
10
[Submitted on 10 Apr 2025] (cross-list from hep-ph)
The Constituent Quark Model
D.R. Entem🇪🇸 · F. Fernández🇪🇸 · P.G. Ortega🇪🇸 · J. Segovia🇪🇸
In this chapter we give a pedagogical introduction to the constituent quark model. The explanation of magnetic moments of the nucleons was crucial to introduce an effective quark mass for light quarks that nowadays are understood as an effect of Spontaneous Chiral Symmetry Breaking in QCD. We give an overview of the first applications of the model and an introduction to the most modern developments studying states beyond the naive quark model as tetraquarks and pentaquarks.
Comments:
commissioned article for the Encyclopedia of Particle Physics
Subjects:
High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
2504.07897 [pdf]
8 citations

Affiliations

first authorsco-authorsvia INSPIRE

Scattering and gluon emission of physical quarks in a SU(3) colored field

Empirical Determination of the Kaon Distribution Amplitude

C and CP violation in effective field theories and applications to η-meson decays

Tidal heating in binary inspiral of strange quark stars

The Constituent Quark Model

Affiliations

$C$ and $C P$ violation in effective field theories and applications to $η$ -meson decays