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Nuclear Theory·nucl-th

Thursday·September 22, 2016

7 papers—4 primary·3 cross-listed

All7Primary4Cross-lists3
  1. 05

    [Submitted on 20 Sept 2016] (cross-list from nucl-ex)

    Phenomenological Implications of the Spectra of and produced at LHC and RHIC

    Rudolph C. Hwa🇺🇸 · Lilin Zhu🇨🇳

    The data on the spectra of and at LHC can be presented in a format that shows exponential behavior up to GeV/c with the same slope for both particles and for nearly all centralities. They are empirical properties that are shared at lower energies with the inverse slope showing a power-law dependence on . The shared properties of the spectra are shown to emerge naturally from the recombination model. No flow is needed. We find experimental hints for the possibility that and are mostly produced in the ridge that are generated by minijets. Appropriate experimental test is suggested.

    Comments:
    4 pages, 4 figures, talk presented at Strangeness in Quark Matter, Berkeley, June 2016
    Subjects:
    Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    1609.06365 [pdf]
    J.Phys.Conf.Ser.(2017)·4 citations
  2. 06

    [Submitted on 23 Jun 2016] (cross-list from hep-ph)

    Fragmentation Functions of neutral mesons and with Laplace transform approach

    F. Taghavi-Shahri🇮🇷 · S. Atashbar Tehrani · M. Zareei🇮🇷

    With an analytical solutions of DGLAP evolution equations based on the Laplace transform method , we find the fragmentation functions (FFs) of neutral mesons, and at NLO approximation. We also calculated the total fragmentation functions of these mesons and compared them with experimental data and those from global fits. The results show a good agreements between our solutions and other models and also are compatible with experimental data.

    Comments:
    17 Pages, 4 Figures
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    1609.06594 [pdf]
    Int.J.Mod.Phys.A(2016)·5 citations
  3. 07

    [Submitted on 21 Sept 2016] (cross-list from hep-ph)

    Analysis of nucleon electromagnetic form factors from light-front holographic QCD : The spacelike region

    Raza Sabbir Sufian🇺🇸 · Guy F. de Téramond🇨🇷 · Stanley J. Brodsky🇺🇸 · Alexandre Deur🇺🇸 · Hans Günter Dosch🇩🇪

    We present a comprehensive analysis of the spacelike nucleon electromagnetic form factors and their flavor decomposition within the framework of light-front holographic QCD. We show that the inclusion of the higher Fock components has a significant effect on the spin-flip elastic Pauli form factor and almost zero effect on the spin-conserving Dirac form factor. We present light-front holographic QCD results for the proton and neutron form factors at any momentum transfer range, including asymptotic predictions, and show that our results agree with the available experimental data with high accuracy. In order to correctly describe the Pauli form factor we need an admixture of a five quark state of about 30 in the proton and about 40 in the neutron. We also extract the nucleon charge and magnetic radii and perform a flavor decomposition of the nucleon electromagnetic form factors. The free parameters needed to describe the experimental nucleon form factors are very few: two parameters for the probabilities of higher Fock states for the spin-flip form factor and a phenomenological parameter , required to account for possible SU(6) spin-flavor symmetry breaking effects in the neutron, whereas the Pauli form factors are normalized to the experimental values of the anomalous magnetic moments. The covariant spin structure for the Dirac and Pauli nucleon form factors prescribed by AdS semiclassical gravity incorporates the correct twist scaling behavior from hard scattering and also leads to vector dominance at low energy.

    Comments:
    Appendix and asymptotic lines in the figures were not included in the previous version, Version published in PRD
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Lattice (hep-lat); Nuclear Theory (nucl-th)
    arXiv:
    1609.06688 [pdf]
    PRD(2017)·81 citations

Affiliations

first authorsco-authorsvia INSPIRE