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Nuclear Theory·nucl-th

Wednesday·February 18, 2026

10 papers—4 primary·6 cross-listed

All10Primary4Cross-lists6
  1. 05

    Dispersive analysis of the process

    Bai-Long Hoid🇩🇪 · Igor Danilkin🇩🇪 · Marc Vanderhaeghen🇩🇪

    We present an analysis of the radiative decay in a dispersive framework, where the two-pion subsystem undergoes strong final-state interactions that cover the and regions. We employ a coupled-channel Muskhelishvili-Omnès framework that allows for a consistent treatment of two scalar resonances and crossed-channel singularities induced by the Born and vector-meson exchanges. We explicitly verify the equivalence between the modified and standard Muskhelishvili-Omnès representations for vector-meson pole contributions when the isoscalar Omnès matrix is chosen asymptotically bounded, and we adopt the standard representation in decay kinematics. This yields, for the first time, a parameter-free dispersive prediction for the kaon Born rescattering, which provides a dominant contribution. To obtain a good fit to the KLOE and SND data, we employ a once-subtracted coupled-channel dispersion relation with heavier left-hand cut contributions and two unknown subtraction constants. The results demonstrate the consistency among the data for scattering, fusion, and radiative decay, thereby validating the underlying dispersive formalism and the input used for the hadronic Omnès matrix and left-hand cuts.

    ↳ hep-phhep-exnucl-thPRD(2026)·1 citation
  2. 06

    Orbital eccentricity can make neutron star g-mode resonances observable with current gravitational-wave detectors

    János Takátsy🇩🇪 · Lorenz Zwick🇩🇰 · Pankaj Saini🇩🇰 · Johan Samsing🇩🇰

    Dynamical tides can provide us vital information about the properties of neutron star (NS) matter. This is particularly true for g-modes, whose frequency and tidal coupling are highly sensitive to the composition of NSs, especially in their centers, where microphysical models are the least reliable. However, due to their weak coupling to external tidal fields, their effect on the gravitational-wave (GW) signal of binary inspirals can be difficult to observe. Here we show that the detectability of these tides can be significantly enhanced by binary NSs with moderate eccentricities. This is primarily due to higher eccentric harmonics in the early phase of the binary evolution experiencing larger phase shifts, which they transport to the sensitive band of GW detectors. In addition, g-mode tides in eccentric binaries undergo several epicyclic resonances, which also amplify the total phase shift. We demonstrate that these effects increase the detectability of g-mode dynamical tides by more than an order of magnitude for eccentricities of , making it possible to put robust constraints on g-mode properties using current GW detectors, while all relevant models could potentially be constrained with eccentric binary NSs with Einstein Telescope.

    ↳ astro-ph.HEhep-phnucl-thPRD(2026)·3 citations
  3. 07

    Back-to-back dijet production in DIS at arbitrary Bjorken-x: TMD gluon distributions to twist-3 accuracy

    Swagato Mukherjee🇺🇸 · Vladimir V. Skokov🇺🇸 · Andrey Tarasov🇺🇸 · Shaswat Tiwari🇺🇸 · Fei Yao🇺🇸

    We derive the gluon transverse-momentum-dependent (TMD) operator structure of back-to-back quark-antiquark dijet production in deep inelastic scattering at arbitrary Bjorken-x to twist-3 accuracy. Working at leading order in the strong coupling and in the kinematic regime where the transverse momentum imbalance of the jets is much smaller than their individual transverse momenta, we perform a systematic gradient expansion of the quark propagator in a background gluon field. This expansion organizes multiple interactions with the target in terms of longitudinal Wilson lines and gauge-invariant field-strength insertions, yielding a TMD description valid beyond the strict high-energy eikonal (x -> 0) approximation. We obtain explicit cross sections for longitudinally and transversely polarized virtual photons, identifying all contributing gluon TMD operators up to twist-3, including structures involving F_+-, F_ij, and three-gluon correlators. The full longitudinal phase associated with Bjorken-x is retained throughout. In the small-x limit, our results reproduce the known sub-eikonal expressions obtained in the Color Glass Condensate framework, establishing a direct connection between the general-x TMD expansion and high-energy factorization. We further reduce the operator basis using equations of motion, minimizing the number of independent nonperturbative matrix elements entering the cross section. This work provides a systematic foundation for extending TMD analyses of dijet production beyond leading twist, establishing a unified operator framework valid at arbitrary Bjorken x that smoothly interpolates between moderate- and small-x descriptions of gluon TMDs.

    ↳ hep-phhep-thnucl-thPRD(2026)·9 citations
  4. 08

    pion-rho Mixing as a mechanism for non-monotonic charged pion behavior in magnetic fields

    Ziyue Wang🇨🇳

    We investigate whether magnetic field induced mixing can explain the non-monotonic behavior of the charged pion reported in lattice QCD. Using a near-pole effective action derived from the SU(2) Nambu--Jona-Lasinio model, we show that the lowest Landau level charged pion mixes with the longitudinally polarized charged rho meson, which shares the same quantum numbers in a magnetic background. The resulting level repulsion is strongly amplified by the suppression of the rho wave-function renormalization near the pole. As a consequence, the lowest mixed mode develops a turnover as the magnetic field increases, reproducing the qualitative trend seen on the lattice. Comparison with the direct determinant solution of the Landau-projected kernel shows that the mechanism is robust, although the quantitative location of the maximum remains scheme dependent. These results support mixing as an important candidate mechanism for charged meson spectra in strong magnetic fields.

    ↳ hep-phnucl-th7 citations
  5. 09

    Charm and strange meson fragmentation functions

    Roberto C. da Silveira🇧🇷 · Ian C. Cloët🇺🇸 · Bruno El-Bennich🇧🇷 · Fernando E. Serna🇨🇱

    Quark fragmentation functions describe the hadronization process of a quark where any of the final-state hadrons carries a fraction of its initial momentum. We compute these fragmentation functions for a cascade that includes pions, kaons, and the charmed and mesons, starting from the elementary quark-to-meson fragmentation process. The latter is obtained from the relevant cut diagram, and employs Poincaré covariant Bethe-Salpeter wave functions and quark propagators. We derive a set of twenty-five coupled jet equations that describe the cascade of emitted mesons in the fragmentation process. Their solutions yield full fragmentation functions that offer a consistent picture of the quark fragmentations across the light and heavy sectors.

    ↳ hep-phhep-exnucl-th0 citations
  6. 10

    More uses for Thermal Models

    Natasha Sharma🇮🇳 · Lokesh Kumar🇮🇳 · Sourendu Gupta🇮🇳

    We explore combinations of particle and anti-particle yields which can be used to test thermal models in a parameter free way. We also explore combinations which can be used to extract , and . We use experimentally measured particle-antiparticle specific ratios for proton , Lambda , and cascade , for 7.7-39 GeV from RHIC BES phase-1 to extract the . These compared well with published STAR freeze-out parameters. These combinations are verified to predict a similar combination of yields. We also extend this idea to predict (anti-)nuclei yields at energies where they are not measured. We also update parametrizations for the dependence of freeze-out parameters and , and present for the first time a similar parametrization of .

    ↳ hep-phnucl-exnucl-thEPJC(2026)·1 citation

Affiliations

first authorsco-authorsvia INSPIRE