PaperPanorama
FAQ

Nuclear Theory·nucl-th

Friday·October 17, 2025

11 papers—4 primary·7 cross-listed

All11Primary4Cross-lists7
  1. 01

    Effects of Subnucleonic Fluctuations on the Longitudinal Dynamics of Heavy-Ion Collisions

    Oscar Garcia-Montero🇩🇪 · Sören Schlichting🇩🇪 · Jie Zhu🇩🇪

    It is well understood that subnuclear fluctuations in the initial state of heavy-ion collisions have an important impact on the creation of long-range correlations in the transverse plane. This is also true for the creation of particle correlations along the beam direction, which can be measured in particle detectors, e.g. through longitudinal decorrelation observables. In this work, we study the emergence of long-range rapidity structures in Pb+Pb collisions using a hybrid model connecting the 3D resolved {\Dipper} initial state model to a (3+1)D viscous hydrodynamics framework CLVisc. We include different sources of fluctuations at the (sub-)nucleon level and present the effects of their inclusion on the longitudinal structure of relevant observables, focusing in this proceedings paper on charged hadron multiplicities, baryon stopping, directed flow and flow decorrelation. We find remarkable agreement to the experimental data regarding directed flow and the rapidity resolved charge particle multiplicity.

    nucl-thhep-phEPJ Web Conf.(2026)·0 citations
  2. 02

    Model Independence of Effective Field Theory

    Anthony W. Thomas🇦🇺

    The use of effective field theory offers a systematic way to improve calculations of nuclear reactions and the properties of atomic nuclei. Its successes have led to the widespread belief that the predictions of this approach are model independent. We explain why this is definitely not the case.

    nucl-thhep-phEPJ Web Conf.(2026)·0 citations
  3. 03

    Hydrodynamization and thermalization in heavy-ion collisions: a kinetic theory perspective

    Caio V. P. de Brito🇧🇷 · Gabriel S. Denicol🇧🇷

    Understanding the applicability of fluid-dynamical models to describe the hot and dense matter produced in the early stages of hadronic collisions is a fundamental problem in the field. In particular, it is not clear to what degree this hydrodynamization process requires proximity to a local equilibrium state. In this contribution, we study this problem in kinetic theory considering an ultrarelativistic gas undergoing strong longitudinal expansion, assuming Bjorken flow. We solve the Boltzmann equation and verify that the system displays considerable deviations from local equilibrium, even though the energy-momentum tensor is well described by fluid dynamics. We further quantify this effect computing the emission of photons in the quark-gluon plasma and verify whether this deviation from equilibrium can be observed.

    nucl-thEPJ Web Conf.(2026)·1 citation
  4. 04

    Effect of Isolation Criteria on Prompt Photon Production in Relativistic Nuclear Collisions

    Sinjini Chandra🇮🇳 · Rupa Chatterjee🇮🇳 · Zubayer Ahammed🇮🇳

    Prompt photon measurements in relativistic nuclear collisions serve as an essential comparative basis for heavy ion studies enabling the separation of medium induced effects. However, the identification of prompt photons is experimentally challenging due to substantial backgrounds from photons produced in hadron decays and jet fragmentation. Appropriate isolation criteria are applied to suppress these background contributions. We analyze prompt photon spectra using the JETPHOX framework to quantify the relative contributions of fragmentation and direct production mechanisms to the total photon yield. We perform a systematic study of the impact of isolation criteria on prompt photon production in relativistic nuclear collisions with emphasis on their dependence on beam energy and photon transverse momentum. The fragmentation contribution is found to be substantially large particularly for GeV and the isolation criterion plays a crucial role in the analysis of prompt photons in that region. A dynamical isolation criterion suppresses the fragmentation component more effectively than a fixed one in this region. Furthermore, the isolation criterion shows a stronger dependence on beam energy and photon than on system size. These observations emphasize the importance of employing carefully selected and consistent isolation criteria when comparing experimental data with theoretical calculations especially for observables sensitive to fragmentation.

    nucl-thhep-phPRC(2025)·0 citations

Affiliations

first authorsco-authorsvia INSPIRE