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Nuclear Theory·nucl-th

Thursday·January 7, 2016

6 papers—4 primary·2 cross-listed

All6Primary4Cross-lists2
  1. 01

    [Submitted on 5 Jan 2016]

    Elastic and Transition Form Factors in DSEs

    Jorge Segovia🇪🇸

    A symmetry preserving framework for the study of continuum Quantum Chromodynamics (QCD) is obtained from a truncated solution of the QCD equations of motion or QCD's Dyson-Schwinger equations (DSEs). A nonperturbative solution of the DSEs enables the study of, e.g., hadrons as composites of dressed-quarks and dressed-gluons, the phenomena of confinement and dynamical chiral symmetry breaking (DCSB), and therefrom an articulation of any connection between them. It is within this context that we present a unified study of Nucleon, Delta and Roper elastic and transition form factors, and compare predictions made using a framework built upon a Faddeev equation kernel and interaction vertices that possess QCD-like momentum dependence with results obtained using a symmetry-preserving treatment of a vectorvector contact-interaction.

    Comments:
    6 pages, 12 figures, to appear in the Proceedings of the Light Cone 2015
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Experiment (hep-ex); High Energy Physics — Lattice (hep-lat); High Energy Physics — Phenomenology (hep-ph)
    arXiv:
    1601.00973 [pdf]
    Few Body Syst.(2016)·3 citations
  2. 02

    [Submitted on 6 Jan 2016]

    Neutrino-Deuteron Reactions in the (1232) Region

    T.-S. H. Lee🇺🇸

    The results from an investigation of the incoherent single pion electroweak production on the deuteron in the (1232) region are reported. The importance of including the nucleon-nucleon final state interactions in extracting the neutrino-nucleon cross sections from the data obtained from the experiments on the deuteron target is demonstrated.

    Comments:
    conference proceeding
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1601.01056 [pdf]
    JPS Conf.Proc.(2016)·0 citations
  3. 03

    [Submitted on 6 Jan 2016]

    The mass of heavy-light mesons in a constituent quark picture with partially restored chiral symmetry

    Aaron Park🇰🇷 · Philipp Gubler🇮🇹 · Masayasu Harada🇯🇵 · Su Houng Lee🇰🇷 · Chiho Nonaka🇯🇵 · Woosung Park🇰🇷

    We probe effects of the partial chiral symmetry restoration to the mass of heavy-light mesons in a constituent quark model by changing the constituent quark mass of the light quark. Due to the competing effect between the quark mass and the linearly rising potential, whose contribution to the energy increases as the quark mass decreases, the heavy-light meson mass has a minimum value near the constituent quark mass typically used in the vacuum. Hence, the meson mass increases as one decreases the constituent quark mass consistent with recent QCD sum rule analyses, which show an increasing meson mass as the chiral order parameter decreases.

    Comments:
    4 pages, 4 figures
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph)
    arXiv:
    1601.01250 [pdf]
    PRD(2016)·24 citations
  4. 04

    [Submitted on 6 Jan 2016]

    The phase-functions method and full cross-section of nucleon-nucleon scattering

    V. I. Zhaba

    For calculation of the single-channel nucleon-nucleon scattering a phase-functions method has been considered. Using a phase-functions method the following phase shifts of a nucleon-nucleon scattering are calculated numerically: nn (1S0-, 3P0-, 3P1-, 1D2-, 3F3- state), pp (1S0-, 3P0-, 3P1-, 1D2- state) and np (1S0-, 1P1-, 3P0-, 3P1-, 1D2-, 3D2- state). The calculations has been performed using realistic nucleon-nucleon potentials Nijmegen groups (NijmI, NijmII, Reid93) and potential Argonne v18. Obtained phase shifts 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. Our results are in good agreement with those obtained by using known phases published in literature. The odds between calculations depending on a computational method of phases of scattering makes: 0,2-6,3% for pp- and 0,1-5,3% for np- scatterings (NijmI, NijmII), 0,1-4,1% for pp- and 0,1-0,4% for np- scatterings (Reid93), no more than 4,5% (Argonne v18).

    Comments:
    6 pages, 3 tables
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1601.01255 [pdf]
    Mod.Phys.Lett.A(2016)·11 citations
  5. 05

    [Submitted on 5 Jan 2016] (cross-list from hep-ph)

    Lepton flavor (universality) violation in rare kaon decays

    Andreas Crivellin🇨🇭 · Giancarlo D'Ambrosio🇮🇹 · Martin Hoferichter🇺🇸 · Lewis C. Tunstall🇨🇭

    Recent anomalies in the decays of mesons and the Higgs boson provide hints towards lepton flavor (universality) violating physics beyond the Standard Model. We observe that four-fermion operators which can explain the -physics anomalies have corresponding analogs in the kaon sector, and we analyze their impact on and decays . For these processes, we note the corresponding physics opportunities at the NA62 experiment. In particular, assuming minimal flavor violation, we comment on the required improvements in sensitivity necessary to test the -physics anomalies in the kaon sector.

    Comments:
    13 pages, 2 figures. v3: version published in PRD with title "Violation of lepton flavor and lepton flavor universality in rare kaon decays"
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); High Energy Physics — Lattice (hep-lat); Nuclear Theory (nucl-th)
    arXiv:
    1601.00970 [pdf]
    PRD(2016)·93 citations
  6. 06

    [Submitted on 6 Jan 2016] (cross-list from hep-ph)

    Initial state and pre-equilibrium effects in small systems

    S. Schlichting🇺🇸

    We discuss the importance of initial state and early time effects with regard to the theoretical understanding of long range azimuthal correlations observed in high-multiplicity and collisions.

    Comments:
    6 pages; Proceedings of Quark Matter 2015, Kobe, Japan -- Invited plenary talk in special session on "QGP in small systems?"
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    1601.01177 [pdf]
    NPA(2016)·12 citations

Affiliations

first authorsco-authorsvia INSPIRE