PaperPanorama
FAQ

Nuclear Theory·nucl-th

Wednesday·July 8, 2015

9 papers—4 primary·5 cross-listed

All9Primary4Cross-lists5
  1. 05

    [Submitted on 6 Jul 2015] (cross-list from hep-ph)

    The role of spin-flipping terms in hadronic transitions of

    Jorge Segovia🇪🇸 · Francisco Fernandez🇪🇸 · David R. Entem🇪🇸

    Recent experimental data on the and processes seem to contradict the naive expectation that hadronic transitions with spin-flipping terms should be suppressed with respect those without spin-flip. We analyze these transitions using the QCD Multipole Expansion (QCDME) approach and within a constituent quark model framework that has been applied successfully to the heavy-quark sectors during the last years. The QCDME formalism requires the computation of hybrid intermediate states which has been performed in a natural, parameter-free extension of our constituent quark model based on the Quark Confining String (QCS) scheme. We show that i) the M1-M1 contribution in the decay rate of the is important and its supression until now is not justified; ii) the role played by the hybrid states, which enter in the calculation of the M1-M1 contribution, explains the enhancement in the decay rate; and iii) the anomalously large decay rate of the process has the same physical origin.

    Comments:
    9 pages, 1 figure, 4 tables
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Theory (nucl-th)
    arXiv:
    1507.01607 [pdf]
    Few Body Syst.(2016)·9 citations
  2. 06

    [Submitted on 6 Jul 2015] (cross-list from hep-ph)

    Universality of multiplicity distribution in proton-proton and electron-positron collisions

    Adam Bzdak🇵🇱

    It is argued that the multiplicity distribution in proton-proton () collisions, which is often parameterized by the negative binomial distribution, may result from the multiplicity distribution measured in electron-positron () collisions, once the fluctuating energy carried by two leading protons in is taken into account.

    Comments:
    4 pages, 1 figure; published version, discussion significantly expanded
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    1507.01608 [pdf]
    PRD(2017)·5 citations
  3. 07

    [Submitted on 7 Jul 2015] (cross-list from hep-ph)

    Searching for observable effects induced by anomalous triangle singularities

    Xiao-Hai Liu🇯🇵 · Makoto Oka🇯🇵 · Qiang Zhao🇨🇳

    We investigate the anomalous triangle singularity (ATS) and its possible manifestations in various processes. We show that the ATS should have important impact on our understanding of the nature of some newly observed threshold states. Discussions on how to distinguish the ATS phenomena from genuine dynamic pole structures are presented.

    Comments:
    13 pages, 5 figures, 1 table, version to appear in Phys. Lett. B
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    1507.01674 [pdf]
    PLB(2016)·146 citations
  4. 08

    [Submitted on 7 Jul 2015] (cross-list from hep-ph)

    Strange particles production in relativistic nucleus-nucleus collisions at the RHIC BES energy region

    Cong-Cong Zhang🇨🇳 · Xian-Bao Yuan🇨🇳 · Sheng-Qin Feng🇨🇳 · Zhong-Bao Yin🇨🇳

    The parton and hadron cascade model PACIAE is used to investigate strange particle production in Au + Au collisions at GeV in different centralities and at 39, 11.5 and 7.7 GeV in the most central collision, respectively. It is shown that the transverse momentum distributions of strange particles by the PACIAE model fit the RHIC Beam Energy Scan experimental results well.

    Comments:
    12 pages, 4 figures
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    1507.01702 [pdf]
    CPC(2016)·0 citations
  5. 09

    [Submitted on 7 Jul 2015] (cross-list from hep-lat)

    On the Implementation of General Background Electromagnetic Fields on a Periodic Hypercubic Lattice

    Zohreh Davoudi🇺🇸 · William Detmold🇺🇸

    Nonuniform background electromagnetic fields, once implemented in lattice quantum chromodynamics calculations of hadronic systems, provide a means to constrain a large class of electromagnetic properties of hadrons and nuclei, from their higher electromagnetic moments and charge radii to their electromagnetic form factors. We show how nonuniform fields can be constructed on a periodic hypercubic lattice under certain conditions and determine the precise form of the background U(1) gauge links that must be imposed on the quantum chromodynamics gauge-field configurations to maintain periodicity. Once supplemented by a set of quantization conditions on the background-field parameters, this construction guarantees that no nonuniformity occurs in the hadronic correlation functions across the boundary of the lattice. The special cases of uniform electric and magnetic fields, a nonuniform electric field that varies linearly in one spatial coordinate (relevant to the determination of quadruple moment and charge radii), nonuniform electric and magnetic fields with given temporal and spatial dependences (relevant to the determination of nucleon spin polarizabilities) and plane-wave electromagnetic fields (relevant to the determination of electromagnetic form factors) are discussed explicitly.

    Comments:
    27 pages, 4 figures
    Subjects:
    High Energy Physics — Lattice (hep-lat); High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    1507.01908 [pdf]
    PRD(2015)·21 citations

Affiliations

first authorsco-authorsvia INSPIRE