System size and energy dependence of near-side di-hadron correlations

STAR Collaboration, G. Agakishiev, M. M. Aggarwal +353

Two-particle azimuthal ($\Delta \varphi$) and pseudorapidity ($\Delta \eta$) correlations using a trigger particle with large transverse momentum ($p_T$) in $d$+Au, Cu+Cu and Au+Au collisions at $\sqrt…