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Nuclear Theory·nucl-th

Tuesday·August 1, 2023

17 papers—7 primary·10 cross-listed

All17Primary7Cross-lists10
  1. 01

    Meson-exchange currents in quasielastic electron scattering in a generalized superscaling approach

    Paloma R. Casale🇪🇸 · J.E. Amaro🇪🇸 · M.B. Barbaro🇮🇹

    We present a model that incorporates the effect of two-body currents in quasielastic electron-nucleus scattering within the framework of a consistent superscaling formalism. This is achieved by defining an averaged single-nucleon hadronic tensor based on the 1p1h matrix element of the one-body current plus meson-exchange currents (MEC). The consistent treatment of one- and two-body currents in our model enables the calculation of exchange current effects in the kinematical region where the Fermi gas response is zero, but not the scaling function. The effect of MEC is consistently taken into account when extracting the phenomenological scaling function from electron scattering data. With this model, we investigate the effect of MEC on the response functions taking into account the effective mass of the nucleon, and examine the consequences it has on the inclusive cross section. We find that 1p1h MEC deplete the quasielastic transverse response, while they not alter significantly the scaling behavior of (e,e') data.

    nucl-thhep-phSymmetry(2023)·10 citations
  2. 02

    Comment on "Electromagnetic form factors for nucleons in short-range correlations": arXiv:2305.13666

    Dmitry N. Kim (1) · Or Hen (2) · Gerald A. Miller (1) · E. Piasetzky (3) · M. Strikman (4) · L. Weinstein (5) ((1) Department of Physics, University of Washington, Seattle, WA 98195-1560, USA (2) Department of Physics, Massachusetts Institute of Technology, Cambridge Massachusetts 02139, USA (3) School of Physics and Astronomy, Tel Aviv University, Tel Aviv 69978, Israel (4) Department of Physics, The Pennsylvania State University, Norfolk, Virginia, 23529, USA (5) Department of Physics, Old Dominion University, Norfolk, Virginia, 23529, USA)

    The relationship between medium modifications of nuclear quark structure functions and medium modifications of elastic electromagnetic form factors is shown to be model dependent.

    nucl-thhep-exhep-phnucl-ex1 citation
  3. 03

    Spin-Induced Interactions and Heavy-Quark Transport in the QGP

    Zhanduo Tang🇺🇸 · Ralf Rapp🇺🇸

    A previously constructed -matrix approach for studying the quark-gluon plasma (QGP) is improved by incorporating spin-dependent interactions between partons. These interactions arise from the relativistic corrections to the Cornell potential. We first study the vacuum spectroscopy of quarkonia with this potential and find that a significant admixture of a vector component in the confining potential (rather than the previously considered scalar interaction) improves the description of the experimental mass splittings in - and -wave states. The in-medium potential containing the vector component in the confining interaction is constrained by fitting lattice-QCD results for heavy-quark (HQ) free energies and the equation of state (EoS) computed within in the selfconsistent -matrix framework. We subsequently extract the transport coefficients for charm quarks in the QGP with the improved in-medium potentials. The relativistic corrections to the vector component of the confining potential cause a notable increase in the thermal relaxation rate of charm quarks in the QGP in comparison to previous calculations, especially at high momenta. These results are expected to have significant ramifications for the phenomenology of open heavy-flavor observables at RHIC and the LHC.

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

    Testing the validity of the surface approximation for reactions induced by weakly bound nuclei with a fully quantum-mechanical model

    Junzhe Liu · Jin Lei · Zhongzhou Ren

    We examine the validity of surface approximation for breakup reactions using a fully quantum-mechanical model proposed by Ichimura, Austern, and Vincent (IAV). Analogous to the semi-classical picture, we introduce radial cut-offs to scattering waves in the IAV framework, which we refer to as IAV-cut. Systematic calculations are conducted for nonelastic breakup reactions induced by Li and deuterons at various incident energies. A comparison between the results obtained from IAV and IAV-cut is performed. The excellent agreement observed between IAV and IAV-cut in Li induced reactions, regardless of incident energy and target nuclei, signifies their insensitivity to the inner part of the scattering wave function, thus providing validation for the semi-classical picture. However, for deuteron induced breakup reactions, the IAV-cut results exhibit a suppression in the cross section, suggesting a strong dependence on the interior wave functions. This suppression is further enhanced as the incident energy increases.

    nucl-thPRC(2023)·5 citations
  5. 05

    Hybrid star structure from perturbative QCD

    Joydev Lahiri🇮🇳 · D. N. Basu🇮🇳

    The stellar configurations of quark stars are studied using perturbative QCD (pQCD) for the equation of state (EoS). The neutron star structures with equation of state obtained from Brussels-Montreal extended Skyrme interaction are also explored. The deconfinement phase transition from quark to hadron phase in stellar interior for matter under extreme pressure is accomplished by employing the Maxwell construction. The influence of hybrid EoS on the jump in energy density has been investigated. To study hybrid stars the BSk24 hadronic model and pQCD EoS for the quark phase have been used. The properties of hybrid stars in the view of the very recent astrophysical observations have been examined. We find that the gravitational mass might exceed 2.3 in some cases, comparable with the observed mass of the pulsar PSR J0952-0607 recently detected.

    nucl-thastro-ph.SR0 citations
  6. 06

    Multi-particle correlations, cumulants, and moments sensitive to fluctuations in rare-probe azimuthal anisotropy in heavy ion collisions

    Abraham Holtermann🇺🇸 · Jacquelyn Noronha-Hostler🇺🇸 · Anne M. Sickles🇺🇸 · Xiaoning Wang🇺🇸

    Correlations of two or more particles have been an essential tool for understanding the hydrodynamic behavior of the quark-gluon plasma created in ultra-relativistic nuclear collisions. In this paper, we extend that framework to introduce a mathematical construction of multi-particle correlators that utilize correlations between arbitrary numbers of particles of interest (e.g. particles selected for their strangeness, heavy flavor, and conserved charges) and inclusive reference particles to estimate the azimuthal anisotropies of rare probes. To estimate the fluctuations and correlations in the azimuthal anisotropies of these particle of interest, we use these correlators in a system of cumulants, raw moments, and central moments. We finally introduce two classes of observables that can compare the fluctuations in the azimuthal anisotropies of particles of interest with reference particles at each order.

    nucl-thnucl-exPRC(2023)·14 citations
  7. 07

    Predicted Measurements of the Tensor-to-Scalar Transition in the CLAS12 Nuclear Targets Experiment

    Erin Marshall Seroka🇺🇸 · Axel Schmidt🇺🇸

    Short-range correlated (SRC) nucleon pairs, which are strongly interacting nucleons at short inter-particle distances, can reveal properties of the effective nucleon-nucleon (\textit{NN}) interaction at short distance scales. The relative abundance of proton-proton (\textit{pp}) pairs and proton-neutron (\textit{pn}) pairs, for example, is sensitive to the tensor contribution to the \textit{NN} interaction. Generalized Contact Formalism (GCF) theory, when used with realistic phenomenological \textit{NN} potential models, predicts a transition from a tensor-dominated regime -- at relative momenta of approximately 400~MeV/\textit{c} where \textit{pp} pairs are suppressed relative to \textit{pn} pairs -- to a scalar-dominated regime at higher momenta with no preferred isospin projection. While an increase in the prevalence of \textit{pp} pairs with increasing momentum has been observed in a few experiments, difficulties associated with neutron detection have so far hindered the observation of a corresponding reduction in the abundance of \textit{pn} pairs. High-precision measurements showing a simultaneous increase in the abundance of \textit{pp} pairs and change in the abundance of \textit{pn} pairs with increasing momentum would conclusively demonstrate the existence of the tensor-to-scalar transition. In this work, we study the potential impact of the recently conducted Nuclear Targets Experiment at the CLAS12 detector at Jefferson Lab, using GCF simulations. We model the expected yields and relevant observables for a carbon target with a beam energy of 6 GeV and show that sufficient statistical precision can be obtained from the experimental data, both for \textit{pp} and \textit{pn} pairs, to observe the tensor-to-scalar transition.

    nucl-thnucl-exEPJA(2023)·1 citation

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first authorsco-authorsvia INSPIRE