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Nuclear Theory·nucl-th

Wednesday·December 5, 2018

8 papers—5 primary·3 cross-listed

All8Primary5Cross-lists3
  1. 06

    [Submitted on 3 Dec 2018] (cross-list from hep-lat)

    Towards the P-wave nucleon-pion scattering amplitude in the channel

    Srijit Paul🇨🇾 · Giorgio Silvi🇩🇪 · Constantia Alexandrou🇨🇾 · Giannis Koutsou🇨🇾 · Stefan Krieg🇩🇪 · Luka Leskovec🇺🇸 · Stefan Meinel🇺🇸 · John Negele🇺🇸 · Marcus Petschlies🇩🇪 · Andrew Pochinsky🇺🇸 · Gumaro Rendon🇺🇸 · Sergey Syritsyn🇺🇸

    We use lattice QCD and the Lüscher method to study elastic pion-nucleon scattering in the isospin channel, which couples to the resonance. Our flavor lattice setup features a pion mass of MeV, such that the strong decay channel is close to the threshold. We present our method for constructing the required lattice correlation functions from single- and two-hadron interpolating fields and their projection to irreducible representations of the relevant symmetry group of the lattice. We show preliminary results for the energy spectra in selected moving frames and irreducible representations, and extract the scattering phase shifts. Using a Breit-Wigner fit, we also determine the resonance mass and the coupling.

    Comments:
    14 pages, 7 figures, Proceedings of the 36th Annual International Symposium on Lattice Field Theory (Lattice 2018), 22-28 July 2018, Michigan State University, East Lansing, Michigan USA
    Subjects:
    High Energy Physics — Lattice (hep-lat); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    1812.01059 [pdf]
    PoS(2018)·12 citations
  2. 07

    [Submitted on 3 Dec 2018] (cross-list from quant-ph)

    Nuclear decay parameter oscillations as possible signal of quantum-mechanical nonlinearity and emergent gravity

    S.N. Mayburov🇷🇺

    Several experimental groups reported the evidence of multiple periodic modulations of nuclear decay constants which amplitudes are of the order .1% and periods of one year, 24 hours or about one month. We argue that such deviations from radioactive decay law can be described in nonlinear quantum mechanics framework, in which decay process obeys to nonlinear Shroedinger equation with Doebner-Goldin terms. Proposed corrections to Hamiltonian of quantum system interaction with gravitation field correspond to some emergent gravity theories, in particular, bilocal gravity model. Decay parameter variations under influence of Sun gravity, calculated in our model, agree well with experimental results for alpha-decay life-time oscillations of Polonium isotopes

    Comments:
    10 pages, talk given at 'Quantum Structures - 2018' conference, Kazan, Russia, July 2018, Int. J. Theor. Phys. (2021) DOI 10.1007/s10773-019-04237x
    Subjects:
    Quantum Physics (quant-ph); General Relativity and Quantum Cosmology (gr-qc); High Energy Physics — Theory (hep-th); Nuclear Theory (nucl-th)
    arXiv:
    1812.01455 [pdf]
    Int.J.Theor.Phys.(2021)·3 citations
  3. 08

    [Submitted on 4 Dec 2018] (cross-list from hep-ph)

    Polynomiality sum rules for generalized parton distributions of spin-1 targets

    W. Cosyn🇧🇪 · A. Freese🇺🇸 · B. Pire🇫🇷

    We present the polynomiality sum rules for all leading-twist quark and gluon generalized parton distributions (GPDs) of spin-1 targets such as the deuteron nucleus. The sum rules connect the Mellin moments of these GPDs to polynomials in skewness parameter , which contain generalized form factors (GFFs) as their coefficients. The decompositions of local currents in terms of generalized form factors for spin-1 targets are obtained as a byproduct of this derivation.

    Comments:
    21 pages, minor revisions, published in PRD
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    1812.01511 [pdf]
    PRD(2019)·19 citations

Affiliations

first authorsco-authorsvia INSPIRE