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Nuclear Theory·nucl-th

Thursday·April 21, 2016

4 papers—3 primary·1 cross-listed

All4Primary3Cross-lists1
  1. 01

    [Submitted on 20 Apr 2016]

    Manifestation of Universality in the Asymmetric Helium Trimer and in the Halo Nucleus C

    Dmitry K. Gridnev · Dario Bressanini

    We prove that the corner angle distributions in the bound three-body system AAB, which consists of two particles of type A and one particle of type B, approach universal form if the pair AA has a virtual state at zero energy and the binding energy of AAB goes to zero. We derive explicit expressions for the universal corner angle distributions in terms of elementary functions, which depend solely on the mass ratio m(A)/m(B) and do not depend on pair interactions. On the basis of experimental data and calculations we demonstrate that such systems as the asymmetric Helium trimer HeHe and the halo nucleus C exhibit universal features. Thus our result establishes an interesting link between atomic and nuclear physics through the few-body universality.

    Subjects:
    Nuclear Theory (nucl-th); Quantum Gases (cond-mat.quant-gas); Mathematical Physics (math-ph); math.MP (math.MP); Quantum Physics (quant-ph)
    arXiv:
    1604.05854 [pdf]
    0 citations
  2. 02

    [Submitted on 20 Apr 2016]

    Photoproduction of hidden-charm states in the reaction near threshold

    Yin Huang🇨🇳 · Ju-Jun Xie🇨🇳 · Jun He🇨🇳 · Xurong Chen🇨🇳 · Hong-Fei Zhang🇨🇳

    We report on a theoretical study of the hidden charm states in the reaction near threshold within an effective Lagrangian approach. In addition to the contributions from the -channel nucleon pole, the -channel exchange, the -channel exchange and the contact term, we study the contributions from the states with spin-parity and . The total and differential cross sections of the reaction are predicted. It is found that the contributions of these states give clear peak structures in the total cross sections. Thus, this reaction is another new platform to study the hidden-charm states. It is expected that our model calculation may be tested by the future experiments.

    Comments:
    8 pages, 5 figures. Accepted for publication in Chinese Physics C
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex)
    arXiv:
    1604.05969 [pdf]
    CPC(2016)·38 citations
  3. 03

    [Submitted on 20 Apr 2016]

    Calculation of phases of np- scattering up to Tlab=3 GeV for Reid68 and Reid93 potentials on the phase-function method

    V. I. Zhaba🇺🇦

    For calculation of the single-channel nucleon-nucleon scattering a phase-functions method has been proposed. Using a phase-functions method the following phase shifts of np- scattering numerically for 1S0-, 1P1-, 3P0-, 3P1-, 1D2-, 3D2-, 1F3-, 3F3-, 1G4-, 3G4- states are calculated. The calculations has been performed using realistic nucleon-nucleon Reid68 and Reid93 potentials. Obtained phase shifts for energy up to 350 MeV are in good agreement with the results obtained in the framework of other methods. Using the obtained phase shifts we have calculated the full cross-section np- scattering.

    Comments:
    4 pages, 5 figures. arXiv admin note: text overlap with arXiv:1603.05382
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1604.06006 [pdf]
    Probl. Atom. Scie. Tech. Vol. 5 (105), P.…·2 citations
  4. 04

    [Submitted on 20 Apr 2016] (cross-list from cond-mat.supr-con)

    Fixed point structure of the Abelian Higgs model

    G. Fejos🇯🇵 · T. Hatsuda🇯🇵

    The order of the superconducting phase transition is analyzed via the functional renormalization group approach. For the first time, we derive fully analytic expressions for the functions of the charge and the self-coupling in the Abelian Higgs model with one complex scalar field in dimensions that support the existence of two charged fixed points: an infrared (IR) stable fixed point describing a second-order phase transition and a tritical fixed point controlling the region of the parameter space that is attracted by the former one. It is found that the region separating first- and second-order transitions can be uniquely characterized by the Ginzburg-Landau parameter , and the system undergoes a second order transition, only if .

    Comments:
    5 pages, 4 figures, title changed, typos corrected, gauge fixing condition refined (results unchanged)
    Subjects:
    Superconductivity (cond-mat.supr-con); High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    1604.05849 [pdf]
    PRD(2016)·10 citations

Affiliations

first authorsco-authorsvia INSPIRE