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Nuclear Theory·nucl-th

Friday·January 26, 2024

12 papers—4 primary·8 cross-listed

All12Primary4Cross-lists8
  1. 01

    The earliest phase of relativistic heavy-ion collisions

    Margaret E. Carrington🇨🇦 · Stanislaw Mrowczynski🇵🇱

    According to the Color Glass Condensate approach to relativistic heavy-ion collisions, the earliest phase of the collision is a glasma which is made of highly populated gluon fields that can be treated classically. Using a proper time expansion we study analytically various properties of the glasma. In particular, we compute the glasma energy-momentum tensor which allows us to obtain the energy density, longitudinal and transverse pressure, collective flow, and angular momentum. We also study the role of the glasma in jet quenching by computing collisional energy loss and transverse momentum broadening.

    nucl-thhep-phActa Phys.Polon.B(2024)·4 citations
  2. 02

    First-order relativistic hydrodynamics with an information current

    Lorenzo Gavassino🇺🇸 · Nick Abboud🇺🇸 · Enrico Speranza🇨🇭 · Jorge Noronha🇺🇸

    We show that it is possible to define a timelike future-directed information current within relativistic first-order hydrodynamics. This constitutes the first step toward a covariantly stable and causal formulation of first-order fluctuating hydrodynamics based on thermodynamic principles. We provide several explicit examples of first-order theories with an information current, covering many physical phenomena, ranging from electric conduction to viscosity and elasticity. We use these information currents to compute the corresponding equal-time correlation functions, and we find that the physically relevant (equal-time) correlators do not depend on the choice of the hydrodynamic frame as long as the frame leads to causal and stable dynamics. In the example of chiral hydrodynamics, we find that circularly polarized shear waves have different probabilities of being excited depending on their handedness, generating net helicity in chiral fluids.

    nucl-thgr-qchep-thPRD(2024)·8 citations
  3. 03

    Contribution of Exchange in Elastic Muon-Proton Scattering

    Atharva Naik🇺🇸 · Andrei Afanasev🇺🇸

    The effect of the lepton's mass is significantly enhanced when the beam's energy is on the order of the lepton's mass. In the case of electrons, this corresponds to beam momenta on the order of a few MeV and is negligible in higher energy experiments. In this study, we calculate the differential cross section for the helicity-flip meson exchange interference in elastic muon-proton scattering . In particular, we examine the meson exchange in the -channel for a longitudinally polarized beam and a transversely polarized target. We demonstrate the contribution to be larger for muons due to the lepton mass difference. Then we construct the corresponding beam-target double-spin asymmetries for the target polarized normal and parallel to the momentum transfer in the Breit frame, and then consider the model dependence of the calculation from the estimation of the vertex. The contribution was found to be on the order of for muons in the kinematic region of the MUSE experiment.

    nucl-thhep-phPRC(2024)·1 citation
  4. 04

    Estimation of the slope of nuclear symmetry energy via charge radii of mirror nuclei

    Sakshi Gautam · Anagh Venneti · Sarmistha Banik · Bijay Agrawal

    Charge radii of mirror nuclei are calculated by implementing pairing effects with the Hartree-Fock Bogoliubov approximation. Correlations between the difference of charge radii () and slope of nuclear symmetry energy (L) are examined for different mirror nuclei pairs of varying masses using 40 different Skyrme energy density functionals. correlations are found to be robust for the binding constraints imposed on density functionals. We observe that and show better correlations in relatively heavier pairs than those obtained in the lighter pairs. Our calculations impose a constraint on the slope of nuclear symmetry energy as -20 MeV 55 MeV with 68\% confidence band using available measurements on charge radii. This is a moderately soft symmetry energy, in contrast to stiff and soft symmetry energy indicated by PREX-II and CREX measurements of neutron skin thickness in and , respectively. Our result is also in agreement with celestial constraints obtained from observational data for neutron stars.

    nucl-thNPA(2024)·12 citations

Affiliations

first authorsco-authorsvia INSPIRE