Abstract
The measurement of resonance production in ultrarelativistic heavy-ion collisions provides a glimpse of the hadronic medium properties and its evolution at different stages. Resonances decaying into hadrons are used to estimate the time span and hadronic interaction cross section in the hadronic phase between chemical and kinetic freeze-out. Specifically, the comparison of K*0(892) and phi(1020) resonances is interesting as the lifetimes of these particles differ by about a factor of 10. Moreover, the nuclear modification factor and azimuthal anisotropy measurements of mesonic resonances, which measure parton energy loss in medium and reflect partonic collectivity, can also probe particle-species and mass ordering. The K*0(892) and phi(1020) resonance production at mid-rapidity (|y|<0.5), measured in high energy (Au+Au, Cu+Cu, d+Au and p+p) collisions at RHIC with STAR experiment, reconstructed by their hadronic decay in Kpi and KK, respectively, are discussed. Mesons' spectra, yields, mean transverse momentum, nuclear modification factor, and azimuthal anisotropy are discussed as a function of centrality and collision energy.
Highlights
Quantum Chromodynamics (QCD) predicts a phase transition from nuclear matter to a state of deconfined matter, called the quark gluon plasma (QGP), at high temperature and energy density [1]
The results presented here are mainly from the Solenoidal Tracker At RHIC (STAR) experiment
DN/dy and average transverse momentum pT can be obtained. These quantities provide important information about the system formed in high energy collisions
Summary
Quantum Chromodynamics (QCD) predicts a phase transition from nuclear matter to a state of deconfined matter, called the quark gluon plasma (QGP), at high temperature and energy density [1]. The study of resonance production can be a useful tool in understanding the properties of the system formed in heavy-ion collisions Since their lifetimes are comparable to that of fireball, resonance particles are expected to decay, rescatter, and regenerate to the kinetic freeze-out state (vanishing elastic collisions). As a result, their characteristic properties may be modified due to in-medium effects [3]. Another interesting property of the φ meson is that being a meson, it has a mass comparable to that of protons and Λ, which are baryons. This is one of the goals of the RHIC Beam Energy Scan (BES) program [9]
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