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Nuclear Theory·nucl-th

Thursday·August 28, 2025

12 papers—7 primary·5 cross-listed

All12Primary7Cross-lists5
  1. 08

    Finite-volume analysis and universal scaling signatures near the chiral phase transition in (2+1)-flavor QCD

    Sabarnya Mitra🇩🇪 · Frithjof Karsch🇩🇪

    For quantifying the universal properties of the chiral phase transition in QCD through numerical calculations on a discrete space-time lattice, one needs to perform controlled extrapolations to the continuum and infinite-volume limits followed by an extrapolation to the limit of massless light quarks. We discuss here, the results on the latter two limits at still finite lattice spacings. We use here for chiral symmetry breaking, an improved order parameter free of additive and multiplicative divergences and we analyse its volume and quark mass dependence. Comparing to the expected universal behavior in the chiral limit, we quantify deviations from the universal finite-size scaling behavior as function of the light to strange quark mass ratio.

    ↳ hep-lathep-phhep-thnucl-ex+1EPJ Web Conf.(2026)·3 citations
  2. 09

    Heavy Quark Pair Energy Correlators: From Profiling Partonic Splittings to Probing Heavy-Flavor Fragmentation

    João Barata🇨🇭 · Jasmine Brewer🇬🇧 · Kyle Lee🇺🇸 · João M. Silva🇪🇸

    We introduce heavy-flavor energy correlators, , as a powerful observable for profiling partonic splittings and characterizing heavy-flavor fragmentation. We present its collinear factorization, perform resummation, and demonstrate the angular distribution's sensitivity to both the heavy-quark pair splitting and their subsequent fragmentation. We then apply the heavy-flavor EEC to probe medium-induced effects, revealing its sensitivity to medium modifications to heavy-quark pair splitting functions and to the medium's spatial structure.

    ↳ hep-phhep-exnucl-exnucl-th19 citations
  3. 10

    Renormalization group analysis of color superconductivity revisited

    Yuki Fujimoto🇯🇵

    Color superconductivity in cold, dense quark matter is a key feature of the QCD phase diagram, whose present theoretical understanding relies predominantly on weak-coupling calculations. In this work, we revisit the evaluation of the color-superconducting gap using a renormalization group (RG) framework formulated in effective theory near the Fermi surface. By incorporating quark self-energy corrections into the RG equation, we reproduce the known weak-coupling results from the gap equation at the same perturbative order at . Within the RG approach, the angular momentum structure of the pairing channel becomes more transparent, allowing us to examine the size of the gap for various pairing patterns. We also compare our results with recent lattice QCD calculations at finite isospin density. Finally, we argue that the RG method potentially offers a simpler and more systematic route to higher-order computations of the gap, which are of order and thus quantitatively important.

    ↳ hep-phnucl-th1 citation
  4. 11

    Exclusive vector-toponium photoproduction in hadronic collisions

    Victor P. Goncalves🇧🇷 · Luana Santana🇧🇷 · Bruno D. Moreira🇧🇷

    An exploratory study of the exclusive production of a vector - toponium state by photon - hadron interactions is performed considering proton - proton and proton - nucleus collisions at the Large Hadron Collider (LHC) and Future Circular Collider (FCC) energies. The scattering amplitude is calculated using the - factorization formalism assuming that the vector - toponium state can be described by a Gaussian light-cone wave function and considering different models for the unintegrated gluon distribution. Predictions for the rapidity distributions and total cross - sections are presented. Our results indicate that the experimental measurement of this final state will be very difficult for the expected integrated luminosities at the LHC and FCC.

    ↳ hep-phhep-exnucl-exnucl-thEPJC(2025)·4 citations
  5. 12

    Measurement of the differential and total cross-sections of -ray emission induced by MeV neutrons for C, Al, Si, Ca, Ti, Cr, and Fe using the tagged neutron method

    P.S. Prusachenko · D.N. Grozdanov · N.A. Fedorov · Yu.N. Kopatch · G.V. Pampushik · P.I. Kharlamov · V.R. Skoy · I.N. Ruskov · T.Yu. Tretyakova · A.V. Andreev · C. Hramco · P.G. Filonchik · TANGRA collaboration

    In this work, differential cross sections of -ray emission produced in nuclear reactions induced by ~MeV neutrons are measured for the ~MeV line from carbon, as well as for individual -ray lines from aluminum, from silicon, from calcium, from titanium, from chromium, and from iron. The measurements were conducted using the tagged neutron method with four LaBr(Ce) scintillation detectors positioned at angles of , , , and relative to the generator target -- sample center axis. A neutron generator capable of producing separate beams of tagged neutrons was employed, which, combined with the detector system, enabled the determination of differential cross-sections for distinct angle values in the range of to . To simplify data visualization, the angular distributions were divided into intervals, with weighted mean values of the angle and differential cross-section calculated for each interval. Corrections for multiple neutron scattering and attenuation, -ray attenuation, and total detection efficiency, computed using GEANT4, were accounted for in the cross-section calculations. Additional measurements were performed to validate the correction calculations. The total -ray emission cross-sections were obtained by approximating the angular distributions with even-order Legendre polynomial expansions up to the th degree, followed by integration over the full solid angle. The total systematic error for the obtained data was estimated as \,\%.

    ↳ nucl-exnucl-thCPC(2026)·2 citations

Affiliations

first authorsco-authorsvia INSPIRE