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Nuclear Theory·nucl-th

Friday·May 26, 2017

6 papers—2 primary·4 cross-listed

All6Primary2Cross-lists4
  1. 03

    [Submitted on 22 May 2017] (cross-list from hep-ph)

    Is Renormalization in QCD Necessary at High Energy Colliders ?

    Gouranga C. Nayak🇺🇸

    In this paper by using the path integral formulation of the background field method of QCD in the presence of SU(3) pure gauge background field we simultaneously prove the renormalization of ultra violet (UV) divergences and the factorization of infrared (IR) and collinear divergences in QCD at all orders in coupling constant. We prove that although perturbative QCD is renormalizable but due to confinement in QCD it is not necessary to renormalize QCD to study hadrons production at high energy colliders. This is consistent with the fact that the partons are not directly experimentally observed but the hadrons are directly experimentally observed.

    Comments:
    3 New Subsections Added, 34 pages latex
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    1705.07913 [pdf]
    19 citations
  2. 04

    [Submitted on 25 May 2017] (cross-list from hep-ph)

    A QFT-induced phase in neutrino flavour oscillations

    Dharam Vir Ahluwalia🇮🇳 · Cheng-Yang Lee🇮🇳

    In the extended Standard Model of particle physics, each neutrino mass eigenstate is predicted to have a tiny but non vanishing magnetic moment induced by quantum field theoretic corrections. These QFT-induced magnetic momenta depend linearly on masses of the underlying mass eigenstates with a proportionality constant . As a consequence when neutrinos are embedded in an environment containing magnetic fields the flavour oscillations get a contribution from the induced relative phases.

    Comments:
    6 pages
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    1705.09066 [pdf]
    EPL(2017)·3 citations
  3. 05

    [Submitted on 23 May 2017] (cross-list from cond-mat.mtrl-sci)

    Optimization of self-interstitial clusters in 3C-SiC with Genetic Algorithm

    Hyunseok Ko · Amy Kaczmarowski · Izabela Szlufarska · Dane Morgan

    Under irradiation, SiC develops damage commonly referred to as black spot defects, which are speculated to be self-interstitial atom clusters. To understand the evolution of these defect clusters and their impacts (e.g., through radiation induced swelling) on the performance of SiC in nuclear applications, it is important to identify the cluster composition, structure, and shape. In this work the genetic algorithm code StructOpt was utilized to identify groundstate cluster structures in 3C-SiC. The genetic algorithm was used to explore clusters of up to ~30 interstitials of C-only, Si-only, and Si-C mixtures embedded in the SiC lattice. We performed the structure search using Hamiltonians from both density functional theory and empirical potentials. The thermodynamic stability of clusters was investigated in terms of their composition (with a focus on Si-only, C-only, and stoichiometric) and shape (spherical vs. planar), as a function of the cluster size (n). Our results suggest that large Si-only clusters are likely unstable, and clusters are predominantly C-only for n <= 10 and stoichiometric for n > 10. The results imply that there is an evolution of the shape of the most stable clusters, where small clusters are stable in more spherical geometries while larger clusters are stable in more planar configurations. We also provide an estimated energy vs. size relationship, E(n), for use in future analysis.

    Comments:
    30 pages, 8 figures
    Subjects:
    cond-mat.mtrl-sci (cond-mat.mtrl-sci); Nuclear Theory (nucl-th)
    arXiv:
    1705.09155 [pdf]
    J.Nucl.Mater.(2017)·0 citations
  4. 06

    [Submitted on 25 May 2017] (cross-list from hep-lat)

    Comment on "Are two nucleons bound in lattice QCD for heavy quark masses? - Sanity check with Lüscher's finite volume formula -"

    Silas R. Beane🇺🇸 · Emmanuel Chang🇺🇸 · Zohreh Davoudi🇺🇸 · William Detmold🇺🇸 · Kostas Orginos🇺🇸 · Assumpta Parreño🇪🇸 · Martin J. Savage🇺🇸 · Brian C. Tiburzi🇺🇸 · Phiala E. Shanahan🇺🇸 · Michael L. Wagman🇺🇸 · Frank Winter🇺🇸

    In this comment, we address a number of erroneous discussions and conclusions presented in a recent preprint by the HALQCD collaboration, arXiv:1703.07210. In particular, we demonstrate that lattice QCD determinations of bound states at quark masses corresponding to a pion mass of MeV are robust, and that the phases shifts extracted by the NPLQCD collaboration for these systems pass all of the 'sanity checks' introduced in arXiv:1703.07210.

    Comments:
    Clarifications added
    Subjects:
    High Energy Physics — Lattice (hep-lat); Nuclear Theory (nucl-th)
    arXiv:
    1705.09239 [pdf]
    31 citations

Affiliations

first authorsco-authorsvia INSPIRE