Jet-Quenching Studies Using Leading Mesons in Cu+Au Collisions at √~sNN=200 GeV

摘要

Quark-gluon plasma (QGP) is a hot and dense color-charged medium, created in ultra-relativistic heavy nuclei collisions. Jet-quenching is one of the evidence for QGP formation and manifests itself in suppressed hadron production at high transverse momenta when compared to proton-proton collisions. We present results of jet-quenching studies in Cu+Au collisions at √~sNN=200 GeV using production of leading mesons (π~0, η, K_S, ω). Measurements are performed with PHENIX spectrometer at RHIC. Yields of π~0, η, K_S, and ω mesons and reconstructed jets show the same suppression level at high transverse momenta region within uncertainties when compared to p+p results. The suppression level of π~0, η, K_S, and ω mesons in Cu+Au collisions is equal within uncertainties to one measured in Au+Au and Cu+Cu collisions at √~sNN=200 GeV at similar participant nucleon numbers.