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Nuclear Theory·nucl-th

Monday·March 8, 2021

5 papers—3 primary·2 cross-listed

All5Primary3Cross-lists2
  1. 01

    [Submitted on 4 Mar 2021]

    Smooth matching of from hadronic to quark and gluon degrees of freedom

    Emma McLaughlin🇺🇸 · Jacob Rose · Paolo Parotto🇩🇪 · Claudia Ratti🇺🇸 · Jacquelyn Noronha-Hostler🇺🇸

    One of the key signatures of the Quark Gluon Plasma (QGP) is the energy loss of high momentum particles as they traverse the strongly interacting medium. The energy loss of these particles is governed by the jet transport coefficient , wherein it has been thought that there is a large jump as the system transitions between the hadron gas and Quark Gluon Plasma phases. Here we calculate within the Hadron Resonance Gas (HRG) model with the particle list PDG16+ and find that, if one incorporates the experimental error in the hadronic calculation of and assumes a higher pseudo-critical temperature, then a smooth transition from the hadron gas phase into the Quark Gluon Plasma phase is possible. We also find a significant enhancement in at finite baryon chemical potential and find issues with the relationship between the shear viscosity and the jet transport coefficient within a hadron gas phase.

    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2103.03329 [pdf]
    4 citations
  2. 02

    [Submitted on 4 Mar 2021]

    at RHIC and the LHC comparing clustering vs substructure

    Nicholas Summerfield🇺🇸 · Bing-Nan Lu🇨🇳 · Christopher Plumberg🇺🇸 · Dean Lee🇺🇸 · Jacquelyn Noronha-Hostler🇺🇸 · Anthony Timmins🇺🇸

    Collisions of light and heavy nuclei in relativistic heavy-ion collisions have been shown to be sensitive to nuclear structure. With a proposed run at the LHC and RHIC we study the potential for finding clustering in O. Here we use the state-of-the-art iEBE-VISHNU package with O nucleonic configurations from {\rm ab initio} nuclear lattice simulations. This setup was tuned using a Bayesian analysis on pPb and PbPb systems. We find that the system always begins far from equilibrium and that at LHC and RHIC it approaches the regime of hydrodynamic applicability only at very late times. Finally, by taking ratios of flow harmonics we are able to find measurable differences between -clustering, nucleonic, and subnucleonic degrees of freedom in the initial state.

    Comments:
    6 pages, 5 figures, 92 references
    Subjects:
    Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
    arXiv:
    2103.03345 [pdf]
    PRC(2021)·66 citations
  3. 03

    [Submitted on 5 Mar 2021]

    Modified equilibrium distributions for Cooper--Frye particlization

    M. McNelis🇺🇸 · U. Heinz🇺🇸

    We introduce a positive definite single-particle distribution that is suitable for describing the transition from a macroscopic hydrodynamic to a microscopic kinetic description during the late stages of heavy-ion collisions in the presence of moderately large viscous corrections. The modified equilibrium distribution function can be constructed with hydrodynamic input from either relativistic viscous fluid dynamics or anisotropic fluid dynamics. We test the modified equilibrium distribution's hydrodynamic output for a stationary hadron resonance gas subject to either shear stress, bulk pressure, or baryon diffusion current at a given freeze-out temperature and baryon chemical potential. While it does not reproduce all components of the net baryon current and energy-momentum tensor exactly, it significantly improves upon the customary linearized approximations for the non-equilibrium correction which typically lead to unphysical negative distribution functions at large particle momenta. A comparison of particle spectra and -differential elliptic flow coefficients from the Cooper-Frye formula computed with the modified equilibrium distribution and with linearized corrections is presented, for two different (2+1)-dimensional hypersurfaces corresponding to central and non-central Pb+Pb collisions at the Large Hadron Collider (LHC).

    Comments:
    23 pages, 10 figures
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph)
    arXiv:
    2103.03401 [pdf]
    PRC(2021)·34 citations

Affiliations

first authorsco-authorsvia INSPIRE