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Nuclear Theory·nucl-th

Thursday·April 26, 2018

7 papers—3 primary·4 cross-listed

All7Primary3Cross-lists4
  1. 04

    [Submitted on 24 Apr 2018] (cross-list from hep-th)

    Kinetic theory for classical and quantum many-body chaos

    Sašo Grozdanov🇺🇸 · Koenraad Schalm🇳🇱 · Vincenzo Scopelliti🇳🇱

    For perturbative scalar field theories, the late-time-limit of the out-of-time-ordered correlation function that measures (quantum) chaos is shown to be equal to a Boltzmann-type kinetic equation that measures the total gross (instead of net) particle exchange between phase space cells, weighted by a function of energy. This derivation gives a concrete form to numerous attempts to derive chaotic many-body dynamics from ad hoc kinetic equations. A period of exponential growth in the total gross exchange determines the Lyapunov exponent of the chaotic system. Physically, the exponential growth is a front propagating into an unstable state in phase space. As in conventional Boltzmann transport, which follows from the dynamics of the net particle number density exchange, the kernel of this kinetic integral equation is also set by the 2-to-2 scattering rate. This provides a mathematically precise statement of the known fact that in dilute weakly coupled gases transport and scrambling (or ergodicity) are controlled by the same physics.

    Comments:
    V2: 10 pages, 1 figure. References and clarifications added. Published version
    Subjects:
    High Energy Physics — Theory (hep-th); Statistical Mechanics (cond-mat.stat-mech); High Energy Physics — Phenomenology (hep-ph); nlin.CD (nlin.CD); Nuclear Theory (nucl-th)
    arXiv:
    1804.09182 [pdf]
    PRE(2019)·42 citations
  2. 05

    [Submitted on 25 Apr 2018] (cross-list from hep-ph)

    Hidden-strange molecular states and the bound state via a QCD van der Waals force

    Jun He🇨🇳 · Hongxia Huang🇨🇳 · Dian-Yong Chen🇨🇳 · Xinmei Zhu🇨🇳

    In this work, we study the hidden-strange molecular states composed of a baryon and a vector meson in a coupled-channel interaction. With the help of the effective Lagrangians which coupling constants are determined by the SU(3) symmetry, the interaction is constructed and inserted into the quasipotential Bethe-Salpeter equation to search for poles in the complex plane, which correspond to molecular states. Two poles are found with a spin parity near the and the thresholds, which can be related to the and the , respectively. No pole near the threshold can be found if direct interaction between a nucleon and meson is neglected according to the OZI rule. After introducing the QCD van der Waals force between a nucleon and meson, a narrow state can be produced near the threshold. Inclusion of the QCD van der Waals force changes the line shape of the invariant mass spectrum in the channel leading to a worse agreement with the present low-precision data. Future experiments at BelleII, JLab, and other facilities will be very helpful to clarify the existence of these possible hidden-strange molecular states.

    Comments:
    6 pages, 1 figure. Version to be published in Phys. Rev. D. Comparison with the Belle experiment is added
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    1804.09383 [pdf]
    PRD(2018)·15 citations
  3. 06

    [Submitted on 25 Apr 2018] (cross-list from hep-ex)

    Sensitivity of Neutrino-Nucleus Interaction Measurements to 2p2h Excitations

    Stephen Dolan🇫🇷 · Ulrich Mosel🇩🇪 · Kai Gallmeister🇩🇪 · Luke Pickering🇺🇸 · Sara Bolognesi🇫🇷

    We calculate the charged-current cross sections obtained at the T2K off-axis near detector for -induced events without pions and any number of protons in the final state using transport theory as encoded in the GiBUU model. In a comparison with recent T2K data the strength of the 2p2h multinucleon correlations is determined. Linking this to the isospin (T) of the initial nuclear state, it is found that T=0 leads to a significantly better fit of the recent cross sections obtained by T2K, thus achieving consistency of the 2p2h multi-nucleon correlation contributions between electron-nucleus and neutrino-nucleus reactions.

    Comments:
    6 pages, 2 figures. Version submitted to PRC (stylistic updates)
    Subjects:
    High Energy Physics — Experiment (hep-ex); High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    1804.09488 [pdf]
    PRC(2018)·36 citations
  4. 07

    [Submitted on 25 Apr 2018] (cross-list from hep-ph)

    Drag force on heavy diquarks and gauge/string duality

    Oleg Andreev🇷🇺

    We use gauge/string duality to model a doubly heavy diquark in a color antitriplet moving in a thermal plasma at temperatures near the critical. With the assumption that there is no relative motion between the constituents, we calculate the drag force on the diquark. At high enough speed we find that diquark string configurations develop a cusp. In addition, we estimate the spatial string tension at non-zero baryon chemical potential, and also briefly discuss an extension to a triply heavy triquark in a color triplet.

    Comments:
    22 pages, many figures; v2: typos corrected; v3: minor improvements and corrections made
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Lattice (hep-lat); High Energy Physics — Theory (hep-th); Nuclear Theory (nucl-th)
    arXiv:
    1804.09529 [pdf]
    PRD(2018)·6 citations

Affiliations

first authorsco-authorsvia INSPIRE