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Nuclear Theory·nucl-th

Wednesday·January 7, 2015

8 papers—4 primary·4 cross-listed

All8Primary4Cross-lists4
  1. 01

    [Submitted on 5 Jan 2015]

    Non-Perturbative Lepton Sea Fermions in the Nucleon and the Proton Radius Puzzle

    Gerald A. Miller🇺🇸

    A potential explanation [U.~D.~Jentschura, Phys.\ Rev.\ A {\bf 88}, 062514 (2013)] of the proton radius puzzle originating from the non-perturbative lepton-pair content of the proton is studied. Well-defined quantities that depend on this lepton-pair content are evaluated. Each is found to be of the order of , so that we find such a lepton-pair content exists in the proton. However, we argue that this relatively large result and general features of loop diagrams rule out the possibility of lepton-pair content as an explanation of the proton radius puzzle. In addition, the contributions of a class of explanations of the proton radius puzzle (for which the dependence on the relative distance is as a contact interaction) is determined.

    Comments:
    7 pages three figures. Various improvements made in v2
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex); Atomic Physics (physics.atom-ph)
    arXiv:
    1501.01036 [pdf]
    PRC(2015)·12 citations
  2. 02

    [Submitted on 6 Jan 2015]

    New boson realization of the Lipkin model obeying the su(2)-algebra

    Y.Tsue (Kochi Univ., Japan) · C.Providencia (Univ de Coimbra, Portugal) · J. da Providencia (Univ. de Coimbra, Portugal) · M.Yamamura (Kansai Univ., Japan)

    New boson representation of the su(2)-algebra proposed by the present authors for describing the damped and amplified oscillator is examined in the Lipkin model as one of simple many-fermion models. This boson representation is expressed in terms of two kinds of bosons with a certain positive parameter. In order to describe the case of any fermion number, third boson is introduced. Through this examination, it is concluded that this representation is well workable for the boson realization of the Lipkin model in any fermion number.

    Comments:
    7 pages, no figure
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1501.01066 [pdf]
    PTEP(2015)·2 citations
  3. 03

    [Submitted on 6 Jan 2015]

    nucleon-nucleon scattering in the modified Weinberg approach

    E. Epelbaum · A. M. Gasparyan · J. Gegelia · H. Krebs

    Nucleon-nucleon scattering in the partial wave is considered in chiral effective field theory within the renormalizable formulation of Ref. [1] beyond the leading-order approximation. By applying subtractive renormalization, the subleading contact interaction in this channel is taken into account non-perturbatively. For a proper choice of renormalization conditions, the predicted energy dependence of the phase shift and the coefficients in the effective range expansion are found to be in a good agreement with the results of the Nijmegen partial wave analysis.

    Comments:
    16 pages, 4 figures
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1501.01191 [pdf]
    EPJA(2015)·36 citations
  4. 04

    [Submitted on 6 Jan 2015]

    Clusters in nuclear matter and Mott points

    G. Röpke

    Light clusters (mass number ) in nuclear matter at subsaturation densities are described using a quantum statistical approach. In addition to self-energy and Pauli-blocking, effects of continuum correlations are taken into account to calculate the quasiparticle properties and abundances of light elements. Medium-modified quasiparticle properties are important ingredients to derive a nuclear matter equation of state applicable in the entire region of warm dense matter below saturation density. The influence of the nucleon-nucleon interaction on the quasiparticle shift is discussed.

    Comments:
    11 pages, 3 figures
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1501.01222 [pdf]
    Phys.Part.Nucl.(2015)·8 citations

Affiliations

first authorsco-authorsvia INSPIRE