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Nuclear Theory·nucl-th

Friday·January 6, 2017

5 papers—5 primary·0 cross-listed

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  1. 01

    [Submitted on 5 Jan 2017]

    A renormalization method for three-boson system with a triboson field

    Shung-Ichi Ando

    A renormalization method that introduces an auxiliary field to represent a three-body bound state is studied in a three-boson system with a triboson field. A cutoff dependence in the three-boson system emerges as a limit cycle, and the cyclic singularity is renormalized by employing two methods: a standard method and the auxiliary field method. For each method, different sets of diagrams are involved for renormalization, and thus we numerically study three quantities: counter term for renormalization, scattering length of -wave boson-diboson scattering, and normalized wavefunction. We confirm that the two methods would lead to the same result.

    Comments:
    15 pages, 12 figures, to appear in JKPS
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph)
    arXiv:
    1701.01200 [pdf]
    J.Korean Phys.Soc.(2017)·1 citation
  2. 02

    [Submitted on 5 Jan 2017]

    An Approach to the Computation of Few/Many-Body Multichannel Reactions

    V. D. Efros

    A method to calculate reactions in quantum mechanics is outlined. It is advantageous, in particular, in problems with many open channels of various nature i.e. when energy is not low. In the method there is no need to specify reaction channels in a dynamics calculation. These channels come into play at merely the kinematics level and only after a dynamics calculation is done. This calculation is of the bound--state type while continuum spectrum states never enter the game.

    Comments:
    12 pages, 3 figures, Procs. of Int. Conf. "Nuclear Theory in the Supercomputing Era - 2016", Khabarovsk, 2016
    Subjects:
    Nuclear Theory (nucl-th); Computational Physics (physics.comp-ph)
    arXiv:
    1701.01253 [pdf]
    1 citation
  3. 03

    [Submitted on 5 Jan 2017]

    Time-dependent density-functional calculation of nuclear response functions

    Takashi Nakatsukasa

    Basic issues of the time-dependent density-functional theory are discussed, especially on the real-time calculation of the linear response functions. Some remarks on the derivation of the time-dependent Kohn-Sham equations and on the numerical methods are given.

    Comments:
    8 pages, Proceedings of the international conference NTSE-2014
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1701.01278 [pdf]
    Proceedings of the International Conferen…·2 citations
  4. 04

    [Submitted on 5 Jan 2017]

    Medium modification of averaged jet charge in heavy-ion collisions

    Shi-Yong Chen🇨🇳 · Ben-Wei Zhang🇨🇳 · En-Ke Wang🇨🇳

    Jet charge characterizes the electric charge distribution inside a jet. In this talk we make the first theoretical study of jet charge in high-energy nuclear collisions and calculate numerically the medium alternations of jet charge due to parton energy loss in the quark-gluon plasma. The parton multiple scattering in hot/dense QCD medium is simulated by a modified version of PYQUEN Monte Carlo model with 3+1D ideal hydrodynamical evolution of the fireball. Our preliminary results show that the averaged jet charge is significant modified in A+A collisions relative to that in p+p. The different features of quark jet charge and gluon jet charge in heavy-ion collisions, and the sensitivity of jet charge modifications to flavour dependence of energy loss are observed, which could then be used to discriminate quark and gluon jet as well as their energy loss patterns in heavy-ion collisions.

    Comments:
    4 pages, 6 figures, proceedings for the Hard Probe 2016 parallel talk
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph)
    arXiv:
    1701.01308 [pdf]
    Nucl.Part.Phys.Proc.(2017)·2 citations
  5. 05

    [Submitted on 5 Jan 2017]

    Vorticity in heavy-ion collisions at the JINR Nuclotron-based Ion Collider fAcility

    Yu. B. Ivanov🇷🇺 · A. A. Soldatov🇷🇺

    Vorticity of matter generated in noncentral heavy-ion collisions at energies of the Nuclotron-based Ion Collider fAcility (NICA) at the Joint Institute for Nuclear Research (JINR) in Dubna is studied. Simulations are performed within the model of the three-fluid dynamics (3FD) which reproduces the major part of bulk observables at these energies. Comparison with earlier calculations is done. Qualitative pattern of the vorticity evolution is analyzed. It is demonstrated that the vorticity is mainly located at the border between participants and spectators. In particular, this implies that the relative -hyperon polarization should be stronger at rapidities of the fragmentation regions than that in the midrapidity region.

    Comments:
    8 pages, 5 figures, the version accepted in Phys. Rev. C
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph)
    arXiv:
    1701.01319 [pdf]
    PRC(2017)·47 citations

Affiliations

first authorsco-authorsvia INSPIRE