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Nuclear Theory·nucl-th

Tuesday·August 20, 2019

10 papers—6 primary·4 cross-listed

All10Primary6Cross-lists4
  1. 01

    [Submitted on 17 Aug 2019]

    Hybrid Color Glass Condensate and hydrodynamic description of the Relativistic Heavy Ion Collider small system scan

    Bjoern Schenke🇺🇸 · Chun Shen🇺🇸 · Prithwish Tribedy🇺🇸

    Multi-particle correlation observables in the Relativistic Heavy Ion Collider small system scan are computed in a framework that contains both initial state momentum anisotropies from the Color Glass Condensate effective theory and final state hydrodynamic evolution. The initial state is computed using the IP-Glasma model and coupled to viscous relativistic hydrodynamic simulations, which are followed by microscopic hadronic transport. All parameters of the calculation were previously constrained using experimental data on Au+Au collisions at the same center of mass energy. We find that the qualitative features of the experimental data, such as the system and centrality dependence of the charged hadron momentum anisotropy, can only be reproduced when final state interactions are present. On the other hand, we also demonstrate that the details of the initial state are crucially important for the quantitative description of observables in the studied small systems, as neglecting the initial transverse flow profile or the initial shear stress tensor, which contain information on the momentum anisotropy from the Color Glass Condensate, has dramatic effects on the produced final state anisotropy. We further show that the initial state momentum anisotropy is correlated with the observed elliptic flow in all small systems, with the effect increasing with decreasing multiplicity. We identify the precise measurement of in d+Au and Au+Au collisions at RHIC energy at the same multiplicity as a means to reveal effects of the initial state momentum anisotropy.

    Comments:
    8 pages, 7 figures
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex)
    arXiv:
    1908.06212 [pdf]
    PLB(2020)·103 citations
  2. 02

    [Submitted on 17 Aug 2019]

    Quantum Brownian motion of a heavy quark pair in the quark-gluon plasma

    Takahiro Miura🇯🇵 · Yukinao Akamatsu🇯🇵 · Masayuki Asakawa🇯🇵 · Alexander Rothkopf🇳🇴

    In this paper we study the real-time evolution of heavy quarkonium in the quark-gluon plasma (QGP) on the basis of the open quantum systems approach. In particular, we shed light on how quantum dissipation affects the dynamics of the relative motion of the quarkonium state over time. To this end we present a novel non-equilibrium master equation for the relative motion of quarkonium in a medium, starting from Lindblad operators derived systematically from quantum field theory. In order to implement the corresponding dynamics, we deploy the well established quantum state diffusion method. In turn we reveal how the full quantum evolution can be cast in the form of a stochastic non-linear Schrödinger equation. This for the first time provides a direct link from quantum chromodynamics (QCD) to phenomenological models based on non-linear Schrödinger equations. Proof of principle simulations in one-dimension show that dissipative effects indeed allow the relative motion of the constituent quarks in a quarkonium at rest to thermalize. Dissipation turns out to be relevant already at early times well within the QGP lifetime in relativistic heavy ion collisions.

    Comments:
    26pages, 7figures; added some sentences
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex); Quantum Physics (quant-ph)
    arXiv:
    1908.06293 [pdf]
    PRD(2020)·71 citations
  3. 03

    [Submitted on 19 Aug 2019]

    Reply to Comment on "Is a Trineutron Resonance Lower in Energy than a Tetraneutron Resonance?"

    S. Gandolfi · H.-W. Hammer · P. Klos · J. E. Lynn · A. Schwenk

    We reply to a Comment on our Letter [Phys. Rev. Lett. 118, 232501 (2017), arXiv:1612.01502] by A. Deltuva and R. Lazauskas [Phys. Rev. Lett 123, 069201 (2019), arXiv:1904.00925].

    Comments:
    2 pages, published version
    Subjects:
    Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
    arXiv:
    1908.06610 [pdf]
    PRL(2019)·12 citations
  4. 04

    [Submitted on 19 Aug 2019]

    Intertwined quantum phase transitions in the Zr chain

    N. Gavrielov · A. Leviatan · F. Iachello

    We introduce the notion of intertwined quantum phase transitions (IQPTs), for which a crossing of two configurations coexists with a pronounced shape-evolution of each configuration. A detailed analysis in the framework of the interacting boson model with configuration mixing, provides evidence for this scenario in the Zr isotopes. The latter exhibit a normal configuration which remains spherical along the chain, but exchanges roles with an intruder configuration, which undergoes first a spherical to prolate-deformed [U(5)SU(3)] QPT and then a crossover to -unstable [SU(3)SO(6)].

    Comments:
    4 pages, 5 figures, Proceedings of the IV International Conference on Nuclear Structure and Dynamics NSD2019, May 13-17, 2019, Venice, Italy
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1908.06677 [pdf]
    EPJ Web Conf.(2019)·0 citations
  5. 05

    [Submitted on 19 Aug 2019]

    Towards a theory of baryon resonances

    Ulf-G. Meißner🇩🇪

    In this talk, I discuss methods that allow for a systematic and model-independent calculation of the hadron spectrum. These are lattice QCD and/or its corresponding Effective Field Theories. Assorted results are shown and I take the opportunity to discuss some misconceptions often found in the literature.

    Comments:
    Opening talk (theory), The 12th International Workshop on the Physics of Excited Nucleons (NSTAR 2019), Bonn, Germany (12 pages, 13 figures)
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Experiment (hep-ex); High Energy Physics — Lattice (hep-lat); High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex)
    arXiv:
    1908.06706 [pdf]
    EPJ Web Conf.(2020)·5 citations
  6. 06

    [Submitted on 19 Aug 2019]

    Faddeev calculations on lambda hypertriton with potentials from Gel'fand-Levitan-Marchenko theory

    Emile Meoto🇿🇦 · Mantile Lekala🇿🇦

    Effective lambda-proton and lambda-neutron potentials, restored from theoretical scattering phases through Gel'fand-Levitan-Marchenko theory, are tested on a lambda hypertriton through three-body calculations. The lambda hypertriton is treated as a three-body system consisting of lambda-proton, lambda-neutron and proton-neutron subsystems. Binding energy and root-mean-square radius are computed for the ground state of lambda hypertriton (). In coordinate space, the dynamics of the system is described using a set of coupled hyperradial equations obtained from the Differential Faddeev Equations. By solving the eigenvalue problem derived from this set of coupled hyperradial equations, the binding energy and root-mean-square matter radius computed are found to be -2.462 MeV and 7.00 fm, respectively. The potentials are also shown to display a satisfactory convergence behaviour.

    Comments:
    9 pages, 8 figures
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1908.06813 [pdf]
    Commun.Theor.Phys.(2020)·5 citations

Affiliations

first authorsco-authorsvia INSPIRE