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Nuclear Theory·nucl-th

Thursday·February 4, 2016

6 papers—5 primary·1 cross-listed

All6Primary5Cross-lists1
  1. 01

    [Submitted on 3 Feb 2016]

    From Extraction of Nucleon Resonances to LQCD

    T.-S. H. Lee · Jia-jun Wu · Hiroyuki Kamano

    The intrinsic difficulties in extracting the hadron resonances from reaction data are illustrated by using several exactly soluble scattering models. The finite-volume Hamiltonian method is applied to predict spectra using two meson-exchange Hamiltonians of reactions. Within a three-channel model with , and channels, we show the advantage of the finite-volume Hamiltonian method over the approach using the Lüscher formula to test Lattice QCD calculations aimed at predicting nucleon resonances. We discuss the necessary steps for using the ANL-Osaka eight-channel Hamiltonian to predict the spectra for testing the LQCD calculations for determining the excited nucleon states up to invariant mass GeV.

    Comments:
    Conference proceeding
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1602.01169 [pdf]
    Few Body Syst.(2016)·4 citations
  2. 02

    [Submitted on 3 Feb 2016]

    Efficient formulas for efficiency correction of cumulants

    Masakiyo Kitazawa🇯🇵

    We derive formulas which connect cumulants of particle numbers observed with efficiency losses with the original ones based on the binomial model. These formulas can describe the case with multiple efficiencies in a compact form. Compared with the presently suggested ones based on factorial moments, these formulas would drastically reduce the numerical cost for efficiency corrections when the order of the cumulant and the number of different efficiencies are large. The efficiency correction with realistic -dependent efficiency would be carried out with the aid of these formulas.

    Comments:
    7 pages
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex)
    arXiv:
    1602.01234 [pdf]
    PRC(2016)·38 citations
  3. 03

    [Submitted on 3 Feb 2016]

    A microscopic nuclear collective rotation-vibration model: 2D submodel

    Parviz Gulshani

    We develop in this article a microscopic version of the successful phenomenological hydrodynamic Bohr-Davydov-Faessler-Greiner (BDFG) model for the collective rotation-vibration motion of a deformed nucleus. The model derivation is not limited to small oscillation amplitudes. The model generalizes the author's previous model to include interaction between collective oscillations in each pair of spatial directions, and to remove many of the previous-model approximations. To derive the model, the nuclear Schrodinger equation is canonically transformed to collective coordinates and then linearized using a constrained variational method. The associated transformation constraints are imposed on the wavefunction and not on the particle co-ordinates. This approach yields four self-consistent, time-reversal invariant, cranking-type Schrodinger equations for the rotation-vibration and intrinsic motions, and a self-consistency equation. To facilitate comparison with the BDFG model, simplify the solution of the equations, and gain physical insight, we restrict in this article the collective oscillations to only two space dimensions. For harmonic oscillator mean-field potentials, the equations are then solved in closed forms and applied to the ground-state rotational bands in some even-even light and rare-earth nuclei. The computed ground-state rotational band excitation energy, quadrupole moment and electric quadrupole transition probabilities are found to agree favourably with measured data and the results from mean-field, Sp(3,R), and SU(3) models.

    Comments:
    12 pages
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1602.01324 [pdf]
    2 citations
  4. 04

    [Submitted on 3 Feb 2016]

    A universal description of pseudorapidity distributions in both nucleus-nucleus and p-p collisions at now available energy regions

    Z. J. Jiang🇨🇳 · H. P. Deng🇨🇳 · Y. Huang🇨🇳

    Investigations have shown that the collective motion not only appears in nucleus-nucleus but also in p-p collisions. The best tool for depicting such collective motion is relativistic hydrodynamics. In this paper, the collective motion is assumed obeying the hydro model which integrates the features of Landau and Hwa-Bjorken theory and is one of a very few analytically solvable models. The fluid is then supposed freezing out into charged particles from a time-like hypersurface with a fixed time of t_FO . The researches of present paper show that this part of charged particles together with leading particles, which, by conventional definition, carry on the quantum numbers of colliding nucleons and take away the most part of incident energy, can give a proper universal description to the pseudorapidity distributions of charged particles measured in both nucleus-nucleus and p-p collisions at now available energy regions.

    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1602.01394 [pdf]
    Adv.High Energy Phys.(2016)·7 citations
  5. 05

    [Submitted on 3 Feb 2016]

    Electromagnetic radiation as a probe of the initial state and of viscous dynamics in relativistic nuclear collisions

    Gojko Vujanovic🇺🇸 · Jean-François Paquet🇺🇸 · Gabriel S. Denicol🇨🇦 · Matthew Luzum🇪🇸 · Sangyong Jeon🇨🇦 · Charles Gale🇨🇦

    The penetrating nature of electromagnetic signals makes them suitable probes to explore the properties of the strongly-interacting medium created in relativistic nuclear collisions. We examine the effects of the initial conditions and shear relaxation time on the spectra and flow coefficients of electromagnetic probes, using an event-by-event 3+1D viscous hydrodynamic simulation (MUSIC).

    Comments:
    14 pages, 14 figures; v2: minor improvements to text
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex)
    arXiv:
    1602.01455 [pdf]
    PRC(2016)·47 citations

Affiliations

first authorsco-authorsvia INSPIRE