Measurements of directed, elliptic, and triangular flow in Cu + Au collisions at sNN=200 GeV

Abstract

identified hadrons π ± , K ± , p, andp produced at midrapidity in Cu+Au collisions at

Scaling Properties of the Mean Multiplicity and Pseudorapidity Density in e−+e+, e±+p, p( p ¯ )+p, p+A and A+A(B) Collisions

“…Moreover, an azimuthal long-range (pseudorapidity difference |∆η| ≥ 4) two-particle angular correlation, akin to the "ridge" that results from collective anisotropic flow in A+A collisions, has been observed in p+p and p+Pb collisions at the Large Hadron Collider (LHC) [15][16][17][18] and in d+Au and He+Au collisions at Relativistic Heavy Ion Collider (RHIC) [19,20]. Qualitative consistency with these data has also been achieved in initial attempts to describe the amplitudes of these correlations hydrodynamically [19][20][21]. Thus, an important open question is whether equilibrium dynamics, linked to a common underlying particle production mechanism, dominates for these systems.…”

Angular structure of jet quenching within a hybrid strong/weak coupling model

“…The study of these collisions at the Relativistic Heavy Ion Collider (RHIC) and at the Large Hadron Collider (LHC) has demonstrated that matter at temperatures above the crossover between hot hadronic matter and hotter QGP exhibits strong collective phenomena [1][2][3][4][5][6][7] which can be described successfully by hydrodynamic simulations of the rapid expansion and cooling of the initially lumpy droplets of matter produced in the collisions [8][9][10][11][12][13][14][15][16][17][18]. Such strong collectivity has also recently been observed in smaller colliding systems, including p-Pb, p-p or 3 He-Au [19][20][21][22][23][24][25][26][27][28][29], for which hydrodynamic simulations also seem to be successful [30][31][32][33][34][35][36][37]. The applicability of hydrodynamics from early times in the evolution and for small systems suggests that the matter formed in these ultrarelativistic collisions is a strongly coupled liquid.…”

Measurement of the relative yields of ψ(2S) to ψ(1S) mesons produced at forward and backward rapidity in Adare1, Aidala2, Ajitanand3 et al. 2017Phys. Rev. CSelf Cite

“…In collisions involving nuclei, the initial heavy quark production can be affected by modifications of the parton distribution functions [6], energy loss in the nucleus [7], and scattering with other partons [8]. Effects which may be of hydrodynamic origin are also present in small systems [9][10][11], and may further alter the heavy quark final state [12,13]. If these flow effects are due to quarkgluon-plasma formation, the presence of deconfined colored partons can inhibit coalescence into a bound state or dissolve fully-formed bound states [14].…”