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Nuclear Theory·nucl-th

Wednesday·May 27, 2020

6 papers—3 primary·3 cross-listed

All6Primary3Cross-lists3
  1. 04

    [Submitted on 25 May 2020] (cross-list from hep-ph)

    Recoil-free azimuthal angle for precision boson-jet correlation

    Yang-Ting Chien🇺🇸 · Rudi Rahn🇳🇱 · Solange Schrijnder van Velzen🇳🇱 · Ding Yu Shao🇺🇸 · Wouter J. Waalewijn🇳🇱 · Bin Wu🇨🇭

    The azimuthal decorrelation between a vector boson and a jet is an essential hard probe in high energy proton-proton and heavy-ion collisions. We overcome intrinsic limitations of previous studies by using a recoil-free axis, achieving unprecedented next-to-next-to-leading logarithmic accuracy with small nonperturbative corrections. This choice of axis also makes the observable robust in the presence of a large background. Furthermore, the azimuthal angle distribution is minimally changed when determined using only charged particle tracks, which offer superior angular resolution for precise measurements. Our effective field theory includes full jet dynamics, and we find contributions from linearly-polarized gluon transverse momentum distributions in the initial and final state.

    Comments:
    7 pages, 4 figures, Published version
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Theory (nucl-th)
    arXiv:
    2005.12279 [pdf]
    PLB(2021)·65 citations
  2. 05

    [Submitted on 25 May 2020] (cross-list from hep-th)

    QCD thermalization: Ab initio approaches and interdisciplinary connections

    Jürgen Berges🇩🇪 · Michal P. Heller🇩🇪 · Aleksas Mazeliauskas🇨🇭 · Raju Venugopalan🇺🇸

    Heavy-ion collisions at BNL's Relativistic Heavy Ion Collider and CERN's Large Hadron Collider provide strong evidence for the formation of a quark-gluon plasma, with temperatures extracted from relativistic viscous hydrodynamic simulations shown to be well above the transition temperature from hadron matter. How the strongly correlated quark-gluon matter forms in a heavy-ion collision, its properties off-equilibrium, and the thermalization process in the plasma, are outstanding problems in QCD. We review here the theoretical progress in this field in weak coupling QCD effective field theories and in strong coupling holographic approaches based on gauge-gravity duality. We outline the interdisciplinary connections of different stages of the thermalization process to non-equilibrium dynamics in other systems across energy scales ranging from inflationary cosmology, to strong field QED, to ultracold atomic gases, with emphasis on the universal dynamics of non-thermal and of hydrodynamic attractors. We survey measurements in heavy-ion collisions that are sensitive to the early non-equilibrium stages of the collision and discuss the potential for future measurements. We summarize the current state-of-the art in thermalization studies and identify promising avenues for further progress.

    Comments:
    73 pages, 32 figures, prepared for Reviews of Modern Physics; version 2: small improvements and additions, submitted version; version 3: accepted version; title changed, differs in style and format from published version in Reviews of Modern Physics
    Subjects:
    High Energy Physics — Theory (hep-th); Quantum Gases (cond-mat.quant-gas); High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th); Quantum Physics (quant-ph)
    arXiv:
    2005.12299 [pdf]
    RMP(2021)·369 citations
  3. 06

    [Submitted on 26 May 2020] (cross-list from hep-ph)

    Hadronic transport coefficients from the linear sigma model at finite temperature

    Matthew Heffernan🇨🇦 · Sangyong Jeon🇨🇦 · Charles Gale🇨🇦

    We investigate general frameworks for calculating transport coefficients for quasiparticle theories at finite temperature. Hadronic transport coefficients are then computed using the linear sigma model (LSM). The bulk viscosity over entropy density () is evaluated in the relaxation time approximation (RTA) and the specific shear viscosity () and static electrical conductivity () are both obtained in the RTA and using a functional variational approach. Results are shown for different values of the scalar-isoscalar hadron vacuum mass with in-medium masses for the interacting fields. The advantages and limitations of the LSM for studies of strongly interacting matter out of equilibrium are discussed and results are compared with others in the literature.

    Comments:
    16 pages, 7 figures; updated to match published version
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    2005.12793 [pdf]
    PRC(2020)·17 citations

Affiliations

first authorsco-authorsvia INSPIRE