Phi meson measurements in Cu+Au collisions at 200 GeV and in U+U collisions at 192 GeV

Abstract

A major objective in the field of high-energy nuclear physics is to quantify and characterize the quark-gluon plasma (QGP) formed in relativistic heavy-ion collisions, representing an ideal liquid with partonic degrees of freedom [1-4]. Due to the very short lifetime the ϕ-meson can decay in QGP, thereby providing a key information on the hot and dense medium properties created in the relativistic heavy ion collisions. In central Cu+Au collision, the smaller nucleus is fully enveloped in the larger one thus reducing the contribution of nucleon-nucleon collisions in the low-density nuclear corona region. The U+U collision system provides the largest energy density available at RHIC. Also, the uranium nucleus is highly asymmetric, which leads to different parametrizations of the U+U collision geometry. In this report we will present latest results on the ϕ-meson production in Cu+Au at and U+U collisions at using the PHENIX detector at the RHIC [5]. This report presents invariant transverse momentum spectra and nuclear modification factors of ϕ-meson.