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Nuclear Theory·nucl-th

Tuesday·May 17, 2016

8 papers—3 primary·5 cross-listed

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  1. 04

    [Submitted on 14 May 2016] (cross-list from hep-ph)

    Hadronic resonances enhanced by thresholds

    T.F. Caramés🇪🇸 · A. Valcarce🇪🇸

    We present a neat example of a meson--baryon system where the vicinity of two different thresholds enhances the binding of a hadronic resonance, a pentaquark. As a consequence the pattern of states may change when moving among different flavor sectors, what poses a warning on naive extrapolations to heavy flavor sectors based on systematic expansions. For this purpose we simultaneously analyze the and two-hadron systems looking for possible bound states or resonances. When a resonance is controlled by a coupled-channel effect, going to a different flavor sector may enhance or diminish the binding. This effect may, for example, generate significant differences between the charmonium and bottomonium spectra above open-flavor thresholds or pentaquark states in the open-charm and open-bottom sectors.

    Comments:
    12 pages, 5 figures. To be published in Phys. Lett. B
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    1605.04428 [pdf]
    PLB(2016)·6 citations
  2. 05

    [Submitted on 14 May 2016] (cross-list from hep-ph)

    Heavy Quark Entropy shift: From the Hadron Resonance Gas to Power Corrections

    E. Megias🇩🇪 · E. Ruiz Arriola🇪🇸 · L.L. Salcedo🇪🇸

    A heavy quark placed in the medium modifies its specific heat. Using a renormalization group argument we show a low energy theorem in terms of the defect in the trace of the energy-momentum tensor which allows the unambiguous determination of the corresponding entropy shift after imposing the third principle of thermodynamics for degenerate states. We show how recent lattice QCD data can be understood in the confined phase in terms of a single-heavy hadronic spectrum and above the phase transition through power corrections which are analyzed by means of a dimension 2 gluon condensate of the dimensionally reduced theory.

    Comments:
    6 pages, 2 figures. Talk given by E.Megias at Excited QCD 2016, 6-12 March 2016, Costa da Caparica, Portugal
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Lattice (hep-lat); High Energy Physics — Theory (hep-th); Nuclear Theory (nucl-th)
    arXiv:
    1605.04453 [pdf]
    Acta Phys.Polon.Supp.(2016)·4 citations
  3. 06

    [Submitted on 15 May 2016] (cross-list from hep-ph)

    Electrophobic Scalar Boson and Muonic Puzzles

    Yu-Sheng Liu🇺🇸 · David McKeen🇺🇸 · Gerald A. Miller🇺🇸

    A new scalar boson which couples to the muon and proton can simultaneously solve the proton radius puzzle and the muon anomalous magnetic moment discrepancy. Using a variety of measurements, we constrain the mass of this scalar and its couplings to the electron, muon, neutron, and proton. Making no assumptions about the underlying model, these constraints and the requirement that it solve both problems limit the mass of the scalar to between about 100 keV and 100 MeV. We identify two unexplored regions in the coupling constant-mass plane. Potential future experiments and their implications for theories with mass-weighted lepton couplings are discussed.

    Comments:
    6 pages, 4 figures, 1 table
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th); Atomic Physics (physics.atom-ph)
    arXiv:
    1605.04612 [pdf]
    PRL(2016)·75 citations
  4. 07

    [Submitted on 16 May 2016] (cross-list from hep-lat)

    Two-flavor Simulations of the and the Role of the Channel

    B. Hu🇺🇸 · R. Molina🇺🇸 · M. Döring🇺🇸 · A. Alexandru🇺🇸

    The meson is the most extensively studied resonance in lattice QCD simulations in two () and three () flavor formulations. We analyze lattice scattering data using unitarized Chiral Perturbation Theory, allowing not only for the extrapolation in mass but also in flavor, . The flavor extrapolation requires information from a global fit to and phase shifts from experiment. While the chiral extrapolation of lattice data leads to masses of the meson far below the experimental one, we find that the missing channel is able to explain this discrepancy.

    Comments:
    5 pages, 3 figures, as accepted by PRL
    Subjects:
    High Energy Physics — Lattice (hep-lat); Nuclear Theory (nucl-th)
    arXiv:
    1605.04823 [pdf]
    PRL(2016)·63 citations
  5. 08

    [Submitted on 16 May 2016] (cross-list from hep-ph)

    The physics of neutrino cross sections: theoretical studies

    Luis Alvarez-Ruso🇪🇸

    The present status of neutrino cross section physics is reviewed focusing on the recent theoretical developments in quasielastic scattering, multi-nucleon contributions to the inclusive scattering and pion production on nucleons and nuclei. A good understanding of these processes is crucial to meet the precision needs of neutrino oscillation experiments. Some of the challenges that arise in the consistent description of MiniBooNE and MINERvA recent data are discussed.

    Comments:
    Talk presented at NuPhys2015 (London, 16-18 December 2015). 8 pages, LaTeX, 3 eps figures
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Theory (nucl-th)
    arXiv:
    1605.04861 [pdf]
    0 citations

Affiliations

first authorsco-authorsvia INSPIRE