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Nuclear Theory·nucl-th

Monday·April 12, 2021

3 papers—1 primary·2 cross-listed

All3Primary1Cross-lists2
  1. 01

    [Submitted on 9 Apr 2021]

    Rigorous constraints on three-nucleon forces in chiral effective field theory from fast and accurate calculations of few-body observables

    S. Wesolowski🇺🇸 · I. Svensson🇸🇪 · A. Ekström🇸🇪 · C. Forssén🇸🇪 · R. J. Furnstahl🇺🇸 · J. A. Melendez🇺🇸 · D. R. Phillips🇺🇸

    We explore the constraints on the three-nucleon force (3NF) of chiral effective field theory (EFT) that are provided by bound-state observables in the and sectors. Our statistically rigorous analysis incorporates experimental error, computational method uncertainty, and the uncertainty due to truncation of the EFT expansion at next-to-next-to-leading order. A consistent solution for the H binding energy, the He binding energy and radius, and the H -decay rate can only be obtained if EFT truncation errors are included in the analysis. All of these except the -decay rate give essentially degenerate constraints on the 3NF low-energy constants, so it is crucial for estimating these parameters. We use eigenvector continuation for fast and accurate emulation of No-Core Shell Model calculations of the considered few-nucleon observables. This facilitates sampling of the posterior probability distribution, allowing us to also determine the distributions of the hyperparameters that quantify the truncation error. We find a EFT expansion parameter of for these observables.

    Comments:
    15 pages, 7 figures; same as published version
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex); Data Analysis, Statistics and Probability (physics.data-an)
    arXiv:
    2104.04441 [pdf]
    PRC(2021)·103 citations
  2. 02

    [Submitted on 9 Apr 2021] (cross-list from hep-ph)

    Modeling (anti)deuteron formation at RHIC with a geometric coalescence model

    Apiwit Kittiratpattana🇹🇭 · Michael Florian Wondrak🇩🇪 · Medina Hamzic🇧🇦 · Marcus Bleicher🇩🇪 · Ayut Limphirat🇹🇭 · Christoph Herold🇹🇭

    We study (anti)deuteron formation rates in heavy-ion collisions in the framework of a wave-function based coalescence model. The main feature of our model is that nucleons are emitted from the whole spherically symmetric fireball volume, while antinucleons are emitted only from a spherical shell close to the surface. In this way, the model accounts for nucleon-antinucleon annihilations in the center of the reaction at lower beam energies. Comparison with experimental data on the coalescence parameter in the range GeV allows us to extract radii of the respective source geometries. Our results are qualitatively supported by data from the UrQMD transport model which shows a comparable trend in the geometric radii as a function of beam energy. In line with our expectations, we find that at lower energies, the central region of the fireball experiences stronger annihilation than at higher energies.

    Comments:
    9 pages, 9 figures, submitted to Physica Scripta as a conference proceeding of the 9thInternational Conference on New Frontiers in Physics(2020)
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    2104.04187 [pdf]
    Phys.Scripta(2021)·3 citations
  3. 03

    [Submitted on 9 Apr 2021] (cross-list from hep-ph)

    Parton rescattering and gluon saturation in dijet production at EIC

    Yuan-Yuan Zhang🇨🇳 · Xin-Nian Wang🇨🇳

    Large angle gluon radiations induced by multiple parton scatterings contribute to dijet production in deeply inelastic scattering off a large nucleus at the Electron-Ion Collider. Within the generalized high-twist approach to multiple parton scattering, such contributions at the leading order in perturbative QCD and large Bjorken momentum fraction can be expressed as a convolution of the multiple parton scattering amplitudes and the transverse momentum dependent (TMD) two-parton correlation matrix elements. We study this medium-induced dijet spectrum and its azimuthal angle correlation under the approximation of small longitudinal momentum transfer in the secondary scattering and the factorization of two-parton correlation matrix elements as a product of quark and gluon TMD parton distribution function (PDF). Using a simple model for gluon saturation based on the parametrized gluon TMD PDF, we can calculate the and dependence of the saturation scale and parton transport coefficient . Contributions to dijet cross section from double scattering are power-suppressed and only become sizable for mini-jets at small transverse momentum. We find that the total dijet correlation for these mini-jets, which also includes the contribution from single scattering, is sensitive to the transverse momentum broadening in the quark TMD PDF at large and saturation in the gluon TMD PDF at small inside the nucleus. The correlation from double scattering is also found to increase with the dijet rapidity gap and have a quadratic nuclear-size dependence because of the Landau-Pomeranchuk-Migdal (LPM) interference in gluon emission induced by multiple scattering. Experimental measurements of such unique features in the dijet correlation can shed light on the LPM interference in strong interaction and gluon saturation in large nuclei.

    Comments:
    23 pages in RevTex with 25 figures, all the results are replaced with new numerical calculations with N_f=3 and the corresponding Lambda_QCD in the strong coupling constant. More discussions are added
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    2104.04520 [pdf]
    PRD(2022)·27 citations

Affiliations

first authorsco-authorsvia INSPIRE