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Nuclear Theory·nucl-th

Thursday·February 12, 2015

7 papers—4 primary·3 cross-listed

All7Primary4Cross-lists3
  1. 01

    [Submitted on 11 Feb 2015]

    Eta-nuclear interaction: optical vs. coupled channels

    J. A. Niskanen🇫🇮

    The existence of etamesic nuclei has been speculated for a long time without firm experimental evidence. Much of the effort has taken place in final state interactions on production. One crucial factor in seeing a quasibound state is its width, which should be related to the imaginary part of the scattering length. Comparing two models for eta-N scattering giving the same elementary scattering length, a simple optical potential and an explicit coupling to the pionic channel, it is seen that the latter yields a much smaller imaginary part for eta-nucleus scattering. This decrease of absorption may also mean a possibility for narrow eta-nuclear states.

    Comments:
    15 pages, 4 figures, verbal clarifications added, Conclusion extended
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph)
    arXiv:
    1502.03278 [pdf]
    PRC(2015)·13 citations
  2. 02

    [Submitted on 11 Feb 2015]

    Determination of the structure of the in collisions

    A.B. Larionov🇩🇪 · M. Strikman🇺🇸 · M. Bleicher🇩🇪

    Currently, the structure of the meson is unknown. Different competing models of the exotic state exist, including the possibilities that this state is either a mesonic molecule with dominating composition, a tetraquark, or a -gluon hybrid state. It is expected that the state is rather strongly coupled to the channel and, therefore, can be produced in and collisions at PANDA. We propose to test the hypothetical molecular structure of by studying the or stripping reactions on a nuclear residue.

    Comments:
    19 pages, 8 figures; version accepted in PLB
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex)
    arXiv:
    1502.03311 [pdf]
    PLB(2015)·11 citations
  3. 03

    [Submitted on 11 Feb 2015]

    Solid-state calculation of crystalline color superconductivity

    Gaoqing Cao🇨🇳 · Lianyi He🇺🇸 · Pengfei Zhuang🇨🇳

    It is generally believed that the inhomogeneous Larkin-Ovchinnikov-Fulde-Ferrell (LOFF) phase appears in a color superconductor when the pairing between different quark flavors is under the circumstances of mismatched Fermi surfaces. However, the real crystal structure of the LOFF phase is still unclear because an exact treatment of 3D crystal structures is rather difficult. In this work we present a solid-state-like calculation of the ground-state energy of the body-centered cubic (BCC) structure for two-flavor pairing by diagonalizing the Hamiltonian matrix in the Bloch space without assuming a small amplitude of the order parameter. We develop a computational scheme to overcome the difficulties in diagonalizing huge matrices. Our results show that the BCC structure is energetically more favorable than the 1D modulation in a narrow window around the conventional LOFF-normal phase transition point, which indicates the significance of the higher-order terms in the Ginzburg-Landau approach.

    Subjects:
    Nuclear Theory (nucl-th); Quantum Gases (cond-mat.quant-gas); Superconductivity (cond-mat.supr-con); High Energy Physics — Phenomenology (hep-ph)
    arXiv:
    1502.03392 [pdf]
    PRD(2015)·12 citations
  4. 04

    [Submitted on 11 Feb 2015]

    Relativistic Coulomb scattering of spinless bosons

    M. G. Garcia🇧🇷 · A. S. de Castro🇧🇷

    The relativistic scattering of spin-0 bosons by spherically symmetric Coulomb fields is analyzed in detail with an arbitrary mixing of vector and scalar couplings. It is shown that the partial wave series reduces the scattering amplitude to the closed Rutherford formula exactly when the vector and scalar potentials have the same magnitude, and as an approximation for weak fields. The behavior of the scattering amplitude near the conditions that furnish its closed form is also discussed. Strong suppressions of the scattering amplitude when the vector and scalar potentials have the same magnitude are observed either for particles or antiparticles with low incident momentum. We point out that such strong suppressions might be relevant in the analysis of the scattering of fermions near the conditions for the spin and pseudospin symmetries. From the complex poles of the partial scattering amplitude the exact closed form of bound-state solutions for both particles and antiparticles with different scenarios for the coupling constants are obtained. Perturbative breaking of the accidental degeneracy appearing in a pair of special cases is related to the nonconservation of the Runge-Lenz vector.

    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Theory (hep-th); Quantum Physics (quant-ph)
    arXiv:
    1502.03419 [pdf]
    PRC(2015)·5 citations

Affiliations

first authorsco-authorsvia INSPIRE