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Nuclear Theory·nucl-th

Monday·July 27, 2026

8 papers—4 primary·4 cross-listed

All8Primary4Cross-lists4
  1. 05

    [Submitted on 23 Jul 2026] (cross-list from hep-lat)

    Lattice study of spin interactions between heavy quarks in the quark-gluon plasma

    Dibyendu Bala🇩🇪 · Olaf Kaczmarek🇩🇪 · Sayantan Sharma🇮🇳 · Swagatam Tah🇮🇳

    We calculate the spin-dependent potential, which is the correction term to the thermal potential between a static quark-antiquark pair within non-relativistic QCD. At leading order in hard thermal loop perturbation theory, we show that this spin-dependent potential has an imaginary part which is different in magnitude for pseudoscalar and vector quarkonium states. For the first time, we extract the imaginary part non-perturbatively using lattice techniques, in the deconfined phase of quenched QCD at MeV, after performing a continuum estimation and subsequent renormalization. We have found that the spin-dependent potential in the quark-gluon plasma phase is complex, and its imaginary part has a remarkably significant contribution over the thermal static potential for charmonium states. Consequences of this thermal spin-dependent potential on the quarkonium spectral functions are also discussed.

    Subjects:
    High Energy Physics — Lattice (hep-lat); High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    2607.21729 [pdf]
    0 citations
  2. 06

    [Submitted on 24 Jul 2026] (cross-list from hep-th)

    Momentum anisotropy from Resistive Magnetohydrodynamics

    Khwahish Kushwah🇧🇷 · Gabriel S. Denicol🇧🇷

    We derive relativistic resistive magnetohydrodynamics framework for a two-component ultrarelativistic plasma of massless, oppositely charged particles directly from the Boltzmann-Vlasov equation using the 14-moment approximation. The resulting second-order equations couple the net-charge diffusion current to the shear-stress tensor through the electric field, with all transport coefficients given in closed microscopic form. In the homogeneous limit, the charge-current dynamics is well described by relaxation-type Ohm's law for moderate field strengths, while large viscosity drives the system into an underdamped oscillatory regime absent from the standard Israel-Stewart formulation. Most strikingly, a purely electric field generates sizable momentum anisotropy even without any underlying flow gradient. Under Bjorken expansion this field-induced anisotropy persists but becomes subleading to the hydrodynamic expansion source.

    Comments:
    Contribution to Strangeness in Quark Matter (SQM) 2026
    Subjects:
    High Energy Physics — Theory (hep-th); Nuclear Theory (nucl-th); Plasma Physics (physics.plasm-ph)
    arXiv:
    2607.21879 [pdf]
    0 citations
  3. 07

    [Submitted on 24 Jul 2026] (cross-list from hep-lat)

    Resonances at finite temperature from the lattice

    Jakob Hoffmann🇩🇪 · Peter Lowdon🇩🇪 · Owe Philipsen🇩🇪

    The properties of hadronic resonances at finite temperature constitute an important probe of the thermal QCD medium. In this work we use the concept of thermoparticles, which characterise thermally-modified but stable particle-like states, to define the notion of two-particle scattering at finite temperature, and establish a unitarity relation for the thermal scattering amplitude. We derive a finite-temperature generalisation of the vacuum two-particle quantisation condition via a skeleton expansion of the finite-volume correlation function. Solving this condition at the finite-volume energy levels of the system constrains the form of the thermal scattering amplitude, and hence the properties of resonances. In contrast to the vacuum case, the kinematic function containing the leading finite-volume corrections is finite at all energies, reflecting the fact that thermoparticles have broadened spectral peaks due to their interactions with the thermal medium. Since all lattice simulations involve a finite temporal extent, our approach can also be used to study finite-temporal size effects in vacuum analyses.

    Comments:
    33 pages, 10 figures
    Subjects:
    High Energy Physics — Lattice (hep-lat); High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Theory (hep-th); Nuclear Theory (nucl-th)
    arXiv:
    2607.22346 [pdf]
    0 citations
  4. 08

    [Submitted on 24 Jul 2026] (cross-list from hep-ph)

    Finite Formation Time Antenna Radiation: Color Spectators Break Single-Emitter BDMPS-Z

    Fabio Domínguez🇪🇸 · Pablo Guerrero-Rodríguez🇪🇸 · Carlos A. Salgado🇪🇸

    We compute the direct contribution to the squared matrix element for the in-medium soft gluon emission off a color-singlet quark-antiquark pair. To do this, we incorporate medium interactions that take place during the finite formation time of the antenna, thereby accounting for a largely neglected source of modifications with respect to the vacuum baseline. As a consequence, non-trivial correlations with the spectator (i.e.\ non-emitting) leg of the antenna emerge, greatly increasing the complexity of the result even at leading- order. The observed modifications entail a significant departure from the limit of instantaneous antenna formation, where the calculation effectively reduces to the well-known BDMPS-Z spectrum.

    Comments:
    32 pages, 6 figures
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    2607.22502 [pdf]
    0 citations

Affiliations

first authorsco-authorsvia INSPIRE