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Nuclear Theory·nucl-th

Thursday·April 23, 2015

7 papers—4 primary·3 cross-listed

All7Primary4Cross-lists3
  1. 05

    [Submitted on 22 Apr 2015] (cross-list from hep-ph)

    Nonchiral enhancement of scalar glueball decay in the Witten-Sakai-Sugimoto model

    Frederic Brünner🇦🇹 · Anton Rebhan🇦🇹

    We estimate the consequences of finite masses of pseudoscalar mesons on the decay rates of scalar glueballs in the Witten-Sakai-Sugimoto model, a top-down holographic model of low-energy QCD, by extrapolating from the calculable vertex of glueball fields and the eta' meson which follows from the Witten-Veneziano mechanism for giving mass to the latter. Evaluating the effect on the recently calculated decay rates of glueballs in the Witten-Sakai-Sugimoto model, we find a strong enhancement of the decay of scalar glueballs into kaons and eta mesons, in fairly close agreement with experimental data on the glueball candidate f0(1710).

    Comments:
    6 pages, 2 tables; v3: minor modifications and references added
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Theory (hep-th); Nuclear Theory (nucl-th)
    arXiv:
    1504.05815 [pdf]
    PRL(2015)·68 citations
  2. 06

    [Submitted on 22 Apr 2015] (cross-list from hep-ph)

    Second Order Transport Coefficient from Chiral Anomaly at Weak Coupling: Diagrammatic Resummation

    Amadeo Jimenez-Alba🇪🇸 · Ho-Ung Yee🇺🇸

    We compute one of the second order transport coefficients arising from the chiral anomaly in a high temperature weakly coupled regime of quark-gluon plasma. This transport coefficient is responsible for the CP-odd current that is proportional to the time derivative of the magnetic field, and can be considered as a first correction to the chiral magnetic conductivity at finite, small frequency. We observe that this transport coefficient has a non-analytic dependence on the coupling as at weak coupling regime, which necessitates a re-summation of infinite ladder diagrams with leading pinch singularities to get a correct leading log result: a feature quite similar to that one finds in the computation of electric conductivity. We formulate and solve the relevant CP-odd Schwinger-Dyson equation in real-time perturbation theory that reduces to a coupled set of second order differential equations at leading log order. Our result for this second order transport coefficient indicates that chiral magnetic current has some resistance to the time change of magnetic field, which may be called "chiral induction effect". We also discuss the case of color current induced by color magnetic field.

    Comments:
    54 pages, 8 figures
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Theory (hep-th); Nuclear Theory (nucl-th)
    arXiv:
    1504.05866 [pdf]
    PRD(2015)·20 citations
  3. 07

    [Submitted on 22 Apr 2015] (cross-list from nucl-ex)

    The role of the g9/2 orbital in the development of collectivity in the A = 60 region: The case of 61Co

    A. D. Ayangeakaa · S. Zhu · R. V. F. Janssens · M. P. Carpenter · M. Albers · M. Alcorta · T. Baugher · P. F. Bertone · C. J. Chiara · P. Chowdhury · H. M. David · A. N. Deacon and 11 other authors

    An extensive study of the level structure of 61Co has been performed following the complex 26Mg(48Ca, 2a4npg)61Co reaction at beam energies of 275, 290 and 320 MeV using Gammasphere and the Fragment Mass Analyzer (FMA). The low-spin structure is discussed within the framework of shell-model calculations using the GXPF1A effective interaction. Two quasi-rotational bands consisting of stretched-E2 transitions have been established up to spins I = 41/2 and (43/2), and excitation energies of 17 and 20 MeV, respectively. These are interpreted as signature partners built on a neutron {\nu}(g9/2)2 configuration coupled to a proton {\pi}p3/2 state, based on Cranked Shell Model (CSM) calculations and comparisons with observations in neighboring nuclei. In addition, four I = 1 bands were populated to high spin, with the yrast dipole band interpreted as a possible candidate for the shears mechanism, a process seldom observed thus far in this mass region.

    Subjects:
    Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    1504.05928 [pdf]
    PRC(2015)·15 citations

Affiliations

first authorsco-authorsvia INSPIRE