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Nuclear Theory·nucl-th

Wednesday·April 12, 2017

9 papers—6 primary·3 cross-listed

All9Primary6Cross-lists3
  1. 07

    [Submitted on 10 Apr 2017] (cross-list from hep-ph)

    3-D Glasma initial state from small-x evolution

    Björn Schenke🇺🇸 · Sören Schlichting🇺🇸

    We present an ab-initio approach to compute the longitudinal dependence of the initial state in heavy-ion collisions by including small-x evolution of the nuclear gluon distributions. Extending the IP-Glasma model by including JIMWLK rapidity evolution, we compute event-by-event rapidity distributions of produced gluons and the early time energy momentum tensor as a function of space-time rapidity and transverse coordinates. We show how the effects of small-x evolution manifest themselves in longitudinal (rapidity) correlations of event-by-event multiplicities and transverse geometry and compare our results to various phenomenological models and experimental observations.

    Comments:
    Quark Matter 2017 conference proceedings
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    1704.03018 [pdf]
    NPA(2017)·1 citation
  2. 08

    [Submitted on 10 Apr 2017] (cross-list from nucl-ex)

    Precise measurement of alpha_K and alpha_T for the 109.3-keV M4 transition in 125Te: Test of internal-conversion theory

    N. Nica · J.C. Hardy · V.E. Iacob · T.A. Werke · C.M. Folden III · K. Ofodile · M.B. Trzhaskovskaya

    We have measured the K-shell and total internal conversion coefficients (ICCs), alpha_K and alpha_T, for the 109.3-keV M4 transition in 125Te to be 185.0(40) and 350.0(38), respectively. Previously this transition's ICCs were considered anomalous, with alpha values lying below calculated values. When compared with Dirac-Fock calculations, our new results show good agreement. The alpha_K result agrees well with the version of the theory that takes account of the K-shell atomic vacancy and disagrees with the one that does not. This is consistent with our conclusion drawn from a series of high multipolarity transitions.

    Comments:
    7 pages, 3 figures. arXiv admin note: substantial text overlap with arXiv:1702.07668, arXiv:1512.06898
    Subjects:
    Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    1704.03074 [pdf]
    PRC(2017)·4 citations
  3. 09

    [Submitted on 11 Apr 2017] (cross-list from hep-ph)

    Pion radiative weak decay from the instanton vacuum

    Sang-In Shim🇰🇷 · Hyun-Chul Kim🇰🇷

    We investigate the vector and axial-vector form factors for the pion radiative weak decays and , based on the gauged effective chiral action from the instanton vacuum in the large limit. The nonlocal contributions, which arise from the gauging of the action, enhance the vector form factor by about , whereas the axial-vector form factor is reduced by almost . Both the results for the vector and axial-vector form factors at the zero momentum transfer are in good agreement with the experimental data. The dependence of the form factors on the momentum transfer is also studied. The slope parameters are computed and compared with other works.

    Comments:
    13 pages, 7 figures. Final version accepted for publication in Phys.Lett. B
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Theory (nucl-th)
    arXiv:
    1704.03263 [pdf]
    PLB(2017)·5 citations

Affiliations

first authorsco-authorsvia INSPIRE