Nuclear modification factors of KS and ω mesons in Cu+Au collisions at p

Abstract

Jet quenching is an important evidence of the quark-gluon plasma (QGP) formation. The effect of jet quenching is emerged in ultra-relativistic heavy-ion collisions (A+A) by suppressed production of hadron yields at high transverse momenta (pT > 5 GeV/c) when compared to one measured in elementary proton-proton collisions (p+p). Cu+Au collisions are characterised by the unique asymmetric nuclei overlap geometry different from one presented in symmetric collisions (Au+Au, Cu+Cu). It makes the Cu+Au collision system especially interesting for jet quenching studies. In this paper we present results of the KS meson production measurement in Cu+Au collisions at with respect to the meson pT and collision centrality obtained using the electromagnetic calorimeter of PHENIX experiment. KS mesons are reconstructed via the KS →π0(→ γγ) π0(→ γγ) decay channel. Obtained KSmeson nuclear modification factors are consistent with ones measured for π0 and η mesons and reconstructed jets in the same collision system and ones measured in Cu+Cu and Au+Au collisions at the same collision energy.