Hydrodynamic predictions for mixed harmonic correlations in 200 GeV Au+ Au collisions

Recent measurements at the Large Hadron Collider involve the correlation of different azimuthal flow harmonics vn. These new observables add constraints to theoretical models and probe aspects of the system that are independent of traditional single-harmonic measurements such as two-particle and multiparticle cumulants vn{m}. Many of these new observables have not yet been measured at the Relativistic Heavy Ion Collider (RHIC), leaving an opportunity to make predictions as a test of models across energies. We make predictions using NEXSPHERIO, a hydrodynamical model which has accurately reproduced a large set of single-harmonic correlations in a large range of transverse momenta and centralities at RHIC. Our predictions thus provide an important baseline for comparison to correlations of flow harmonics, which contain nontrivial information about the initial state as well as quark-gluon plasma transport properties. We also point out significant biases that can appear when using wide centrality bins and nontrivial event weighting, necessitating care in performing experimental analyses and in comparing theoretical calculations to these measurements

Hydrodynamic predictions for mixed harmonic correlations in 200 GeV Au+ Au collisions

Recent measurements at the Large Hadron Collider involve the correlation of different azimuthal flow harmonics vn. These new observables add constraints to theoretical models and probe aspects of the system that are independent of traditional single-harmonic measurements such as two-particle and multiparticle cumulants vn{m}. Many of these new observables have not yet been measured at the Relativistic Heavy Ion Collider (RHIC), leaving an opportunity to make predictions as a test of models across energies. We make predictions using NEXSPHERIO, a hydrodynamical model which has accurately reproduced a large set of single-harmonic correlations in a large range of transverse momenta and centralities at RHIC. Our predictions thus provide an important baseline for comparison to correlations of flow harmonics, which contain nontrivial information about the initial state as well as quark-gluon plasma transport properties. We also point out significant biases that can appear when using wide centrality bins and nontrivial event weighting, necessitating care in performing experimental analyses and in comparing theoretical calculations to these measurements

Dissipative corrections to particle spectra and anisotropic flow from a saddle-point approximation to kinetic freeze out

Lang C, Borghini N. Dissipative corrections to particle spectra and anisotropic flow from a saddle-point approximation to kinetic freeze out. The European Physical Journal C. 2014;74(7): 2955.A significant fraction of the changes in momentum distributions induced bydissipative phenomena in the description of the fluid fireball created inultrarelativistic heavy ion collisions are actually taking place when the fluidturns into individual particles. We study these corrections in the limit of alow freeze-out temperature of the flowing medium, and show that they mostlyaffect particles with a higher velocity than the fluid. For these, we deriverelations between different flow harmonics, from which the functional form ofthe dissipative corrections could ultimately be reconstructed from experimentaldata

Three-loop HTLpt thermodynamics at finite temperature and chemical potential

Haque N, Bandyopadhyay A, Andersen JO, Mustafa MG, Strickland M, Su N. Three-loop HTLpt thermodynamics at finite temperature and chemical potential. Journal of High Energy Physics. 2014;2014(5): 27.We calculate the three-loop thermodynamic potential of QCD at finitetemperature and chemical potential using the hard-thermal-loop perturbationtheory (HTLpt) reorganization of finite temperature and density QCD. Theresulting analytic thermodynamic potential allows us to compute the pressure,energy density, and entropy density of the quark-gluon plasma. Using these wecalculate the trace anomaly, speed of sound, and second-, fourth-, andsixth-order quark number susceptibilities. For all observables considered wefind good agreement between our three-loop HTLpt calculations and availablelattice data for temperatures above approximately 300 MeV