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Nuclear Theory·nucl-th

Wednesday·November 16, 2016

7 papers—3 primary·4 cross-listed

All7Primary3Cross-lists4
  1. 04

    [Submitted on 11 Nov 2016] (cross-list from hep-lat)

    Euclidean relativistic quantum mechanics - scattering asymptotic conditions

    W. N. Polyzou🇺🇸 · Gordon Aiello🇺🇸

    We discuss the formulation of the scattering asymptotic condition in a relativistic quantum theory formulated in terms of reflection positive Euclidean Green functions.

    Comments:
    8 pages, proceedings of light cone 2016, Lisbon Portugal
    Subjects:
    High Energy Physics — Lattice (hep-lat); High Energy Physics — Theory (hep-th); Nuclear Theory (nucl-th)
    arXiv:
    1611.04631 [pdf]
    Few Body Syst.(2017)·0 citations
  2. 05

    [Submitted on 15 Nov 2016] (cross-list from hep-ph)

    Relativistic effects in model calculations of double parton distribution function

    Matteo Rinaldi🇪🇸 · Federico Alberto Ceccopieri🇮🇹

    In this paper we consider double parton distribution functions (dPDFs) which are the main non perturbative ingredients appearing in the double parton scattering cross section formula in hadronic collisions. By using recent calculation of dPDFs by means of constituent quark models within the so called Light-Front approach, we investigate the role of relativistic effects on dPDFs. We find, in particular, that the so called Melosh operators, which allow to properly convert the LF spin into the canonical one and incorporate a proper treatment of boosts, produce sizeable effects on dPDFs. We discuss specific partonic correlations induced by these operators in transverse plane which are relevant to the proton structure and study under which conditions these results are stable against variations in the choice of the proton wave function.

    Comments:
    8 Figures, 9 pages and 1 table
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    1611.04793 [pdf]
    PRD(2017)·35 citations
  3. 06

    [Submitted on 15 Nov 2016] (cross-list from hep-ph)

    Analytic Solutions of Transverse Magneto-hydrodynamics under Bjorken Expansion

    Shi Pu🇩🇪 · Di-Lun Yang🇯🇵

    We review the recent developments of analytic solutions in transverse magneto-hydrodynamics under Bjorken expansion. It is found that the time dependence of magnetic fields can either increase or reduce the energy density depending on the decay exponent of magnetic fields. Moreover, perturbative solutions under weak magnetic fields with spatial inhomogeneity results in transverse flow, where the directions of flow also depend on the decay exponent of magnetic fields in time.

    Comments:
    6 pages, 2 figures, proceeding of XII Confinement and the hadron spectrum
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    1611.04840 [pdf]
    EPJ Web Conf.(2017)·16 citations
  4. 07

    [Submitted on 15 Nov 2016] (cross-list from hep-ph)

    Direct-Photon Spectra and Anisotropic Flow in Heavy Ion Collisions from Holography

    Ioannis Iatrakis🇳🇱 · Elias Kiritsis🇬🇷 · Chun Shen🇨🇦 · Di-Lun Yang🇯🇵

    The thermal-photon emission from strongly coupled gauge theories at finite temperature is calculated by using holographic models for QCD in the Veneziano limit (V-QCD). These emission rates are then embedded in hydrodynamic simulations combined with prompt photons from hard scattering and the thermal photons from hadron gas to analyze the spectra and anisotropic flow of direct photons at RHIC and LHC. The results from different sources responsible for the thermal photons in the quark gluon plasma (QGP) including the weakly coupled QGP (wQGP) from perturbative calculations, strongly coupled =4 super Yang-Mills (SYM) plasma (as a benchmark for reference), and Gubser's phenomenological model mimicking the strongly coupled QGP (sQGP) are then compared. It is found that the direct-photon spectra are enhanced in the strongly coupled scenario compared with the ones in the wQGP, especially at intermediate and high momenta, which improve the agreements with data. Moreover, by using IP-glassma initial states, both the elliptic flow and triangular flow of direct photons are amplified at high momenta (>2.5 GeV) for V-QCD, while they are suppressed at low momenta compared to wQGP. The distinct results in holography stem from the blue-shift of emission rates in strong coupling. In addition, the spectra and flow in small collision systems were evaluated for future comparisons. It is found that thermal photons from the deconfined phase are substantial to reconcile the spectra and flow at high momenta.

    Comments:
    10 pages, 7 figures, proceeding of XII Confinement and the hadron spectrum
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Theory (hep-th); Nuclear Theory (nucl-th)
    arXiv:
    1611.04848 [pdf]
    EPJ Web Conf.(2017)·3 citations

Affiliations

first authorsco-authorsvia INSPIRE