Nuclear Theory·nucl-th

Monday·March 8, 2021

5 papers—3 primary·2 cross-listed

01
Smooth matching of $q^$ 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 $q^/ T^{3}$ , 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 $q^/ T^{3}$ 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 $q^/ T^{3}$ 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 $q^/ T^{3}$ 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.
nucl-th4 citations
02
$^{16} O^{16} O$ at RHIC and the LHC comparing $α$ 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 $^{16} O^{16} O$ run at the LHC and RHIC we study the potential for finding $α$ clustering in $^{16}$ O. Here we use the state-of-the-art iEBE-VISHNU package with $^{16}$ 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 $^{16} O^{16} O$ 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 $α$ -clustering, nucleonic, and subnucleonic degrees of freedom in the initial state.
nucl-thnucl-exPRC(2021)·66 citations
03
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 $δ f_{n}$ which typically lead to unphysical negative distribution functions at large particle momenta. A comparison of particle spectra and $p_{T}$ -differential elliptic flow coefficients from the Cooper-Frye formula computed with the modified equilibrium distribution and with linearized $δ f_{n}$ 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).
nucl-thhep-phPRC(2021)·34 citations
04
Extraction of the Sivers function from SIDIS, Drell-Yan, and $W^{\pm} / Z$ boson production data with TMD evolution
Marcin Bury🇩🇪 · Alexei Prokudin🇺🇸 · Alexey Vladimirov🇩🇪
We perform a global fit of the available polarized Semi-Inclusive Deep Inelastic Scattering (SIDIS), polarized pion-induced Drell-Yan (DY) and $W^{\pm} / Z$ boson production data at N $^{3}$ LO and NNLO accuracy of the Transverse Momentum Dependent (TMD) evolution, and extract the Sivers function for $u$ , $d$ , $s$ and for sea quarks. The Qiu-Sterman function is determined in a model independent way via the operator product expansion from the extracted Sivers function. The analysis is supplemented by additional studies, such as the estimation of applicability region, the impact of the unpolarized distributions' uncertainties, the universality of the Sivers functions, positivity constraints, the significance of the sign-change relation, and the comparison with the existing extractions
↳ hep-phhep-exnucl-thJHEP(2021)·79 citations
05
Nuclear binding energy in holographic QCD
Koji Hashimoto🇯🇵 · Yoshinori Matsuo🇯🇵
Saturation of the nuclear binding energy is one of the most important properties of atomic nuclei. We derive the saturation in holographic QCD, by building a shell-model-like mean-field nuclear potential from the nuclear density profile obtained in a holographic multi-baryon effective theory. The numerically estimated binding energy is close to the experimental value.
↳ hep-thnucl-thPRD(2021)·1 citation

Affiliations

first authorsco-authorsvia INSPIRE

Smooth matching of q^​ from hadronic to quark and gluon degrees of freedom

16O16O at RHIC and the LHC comparing α clustering vs substructure

Modified equilibrium distributions for Cooper--Frye particlization

Extraction of the Sivers function from SIDIS, Drell-Yan, and W±/Z boson production data with TMD evolution

Nuclear binding energy in holographic QCD

Affiliations

Smooth matching of $q^$ from hadronic to quark and gluon degrees of freedom

$^{16} O^{16} O$ at RHIC and the LHC comparing $α$ clustering vs substructure

Extraction of the Sivers function from SIDIS, Drell-Yan, and $W^{\pm} / Z$ boson production data with TMD evolution