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Nuclear Theory·nucl-th

Wednesday·March 18, 2026

10 papers—5 primary·5 cross-listed

All10Primary5Cross-lists5
  1. 06

    Strangeness neutrality and the QCD phase diagram

    Wei-jie Fu🇨🇳 · Chuang Huang🇩🇪 · Jan M. Pawlowski🇩🇪 · Fabian Rennecke🇩🇪 · Rui Wen🇨🇳 · Shi Yin🇩🇪

    We map out the phase structure of flavour QCD at strangeness neutrality with functional QCD. We find a critical end point at \,MeV. The computation is done with the functional renormalisation group, and we systematically improve on previous works, hence reducing the systematic error significantly. Our results pass relevant QCD benchmarks: they agree well with and corroborate the QCD phase structure from functional QCD results at vanishing strangeness chemical potential. Moreover, they agree well with lattice QCD results at vanishing chemical potential. Specifically, the ratio of the second order curvature coefficient agrees with that obtained from lattice computations, .

    ↳ hep-phhep-exnucl-exnucl-th13 citations
  2. 07

    Polarization-dependent mass modifications of meson with finite momentum in nuclear matter

    Ahmad Jafar Arifi🇯🇵 · Philipp Gubler🇯🇵 · Kazuo Tsushima🇧🇷

    We investigate the in-medium properties of the meson with finite momentum, going beyond the commonly studied case at rest. In a nuclear medium, Lorentz invariance is broken, leading to distinct longitudinal and transverse polarization modes that evolve differently with density and momentum. Within an effective Lagrangian approach, we calculate the polarization-dependent mass shifts and width modifications of the meson arising from loops and mean-field interactions. The divergent loop integrals are regulated using two different schemes: a covariant form factor and dimensional regularization. Our results show that the mass shift of the transverse polarization is independent of the -meson momentum, whereas that of the longitudinal polarization decreases quadratically with momentum. This difference originates from the coupling of the longitudinal mode to the vector mean field and derivative-type interactions in the self-energy. These effects have direct implications for experimental observables, especially for upcoming measurements at J-PARC, and provide a new prediction for experiments studying hadron dynamics in dense matter.

    ↳ hep-phnucl-thPRD(2026)·2 citations
  3. 08

    Lattice QCD at finite temperature and density

    Heng-Tong Ding🇨🇳

    I review recent lattice results on strongly interacting matter under extreme conditions, with emphasis on the finite-temperature QCD transition at , its approach toward the chiral limit and the fate of the anomaly, as well as recent constraints on the QCD phase boundary and the possible critical endpoint at . I also discuss selected advances in lattice methods and in QCD thermodynamics under external conditions, in particular strong magnetic fields, isospin chemical potential, rotation, acceleration, and quark spin polarization.

    ↳ hep-lathep-phhep-thnucl-ex+15 citations
  4. 09

    Fission mode identification in the 180Hg region: derivative analysis approach

    D. T. Kattikat Melcom🇫🇷 · I. Tsekhanovich🇫🇷 · F. Guezet🇫🇷 · A. Andreyev🇬🇧 · K. Nishio🇯🇵

    Experimental setups commonly used to study fission properties of nuclei in the exotic neutron-deficient 180Hg region are based on the time-of-flight technique for the fission-product identification. The nuclei of interest are created via fusion reactions at excitation energies of several tens of MeV and identified with limited mass resolution. The deduced final fission-fragment mass distributions are in general structureless, which makes the identification of fission modes, along with their properties, ambiguous and author-dependent. The standard functional-analysis technique applied to the simulated limited-resolution fusion-fission data appears to provide consistent results on the number and parameters of fission modes, even in cases of strong symmetric-mode dominance, i.e. for Gaussian-like fission-fragment mass distribution shapes. The method is shown to work also on data sets with limited statistics (real experimental data with integral of a few tens of thousands of events).

    ↳ nucl-exnucl-thPRC(2026)·0 citations
  5. 10

    Finite size effects on critical correlations in momentum space

    Athanasios Brofas🇬🇷 · Fotios K. Diakonos🇬🇷

    The search for the QCD critical end point (CEP) is a major objective of contemporary heavy-ion physics, motivating the study of fluctuation observables that are sensitive to critical dynamics. In particular, baryon-number fluctuations provide a natural probe because the net-baryon density can serve as an effective order parameter in the vicinity of the CEP. Near criticality, long-range correlations and power-law scaling are expected to emerge in the real-space two-point function of the baryon density, yet the finite size and finite lifetime of the fireball created in heavy-ion collisions impose intrinsic cutoffs that regulate the growth of the correlation length. These finite-size constraints significantly modify the observable structure of fluctuations, especially in momentum space, where experiments perform measurements. In this work we present a theoretical analysis of the momentum-space two-point correlation function for a system of finite spatial extent. We show that finite size effects lead to an effective scaling exponent which coincides with that of the infinitely extended system only in a prescribed scaling region within the experimentally accessible momentum range.

    ↳ hep-phhep-exnucl-exnucl-th1 citation

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first authorsco-authorsvia INSPIRE