Abstract
The recent STAR heavy-ion results obtained in the first phase of the RHIC Beam Energy Scan program are presented. The measurements of particle spectra have been performed over a wide range of collision energy √sNN =7.7-200 GeV, centrality and transverse momentum of produced particles. The fixed target mode in heavy-ion collisions at the STAR experiment also extends considerably the range of search for the new physics. Heavy quarks provide an exceptional probe in understanding properties of the hot and dense medium created in such collisions. The Heavy Flavor Tracker (HFT) and Muon Telescope Detector (MTD) upgrades at the STAR experiment at RHIC significantly improved the experimental capabilities of TPC, ToF and EMC detectors in measuring both open and hidden heavy flavor hadrons in heavy-ion collisions.
Highlights
The main goal of the physics program at the Relativistic Heavy Ion Collider (RHIC) is to produce a new state of the nuclear matter in collisions of heavy ions and to investigate its properties over a wide range of energy, centrality with various probes and to determine the features of the phase diagram of the nuclear matter [1,2,3,4]
Muon Telescope Detector (MTD) upgrades at the STAR experiment at RHIC significantly improved the experimental capabilities of Time Projection Chamber (TPC), Time-Of- Flight detectors (ToF) and EMC detectors in measuring both open and hidden heavy flavor hadrons in heavy-ion collisions
The time-of-flight detector (TOF) is based on Multi-gap Resistive Plate Chamber (MRPC) technology and is very useful to identify the particles at relatively higher momentum range compared to TPC
Summary
The main goal of the physics program at the Relativistic Heavy Ion Collider (RHIC) is to produce a new state of the nuclear matter in collisions of heavy ions and to investigate its properties over a wide range of energy, centrality with various probes and to determine the features of the phase diagram of the nuclear matter [1,2,3,4]. The new state at the top RHIC energy is found to be characterized by the suppression of the high transverse momentum (pT ) hadron production in Au+Au collisions relative to p + p collisions [10], large elliptic flow (v2) for hadrons with light and heavier strange valence quarks, differences between baryon and meson v2 at intermediate pT for Au+Au collisions [11, 12], enhanced correlated yields at large Δη and Δφ 0 [13] These properties are associated with the existence of a quark-gluon phase of the nuclear matter. Large fluctuations or divergence of some observables at fixed kinematic and dynamical conditions is usually considered as a characteristic behavior of the system near a critical point Before looking for these signatures, one should know the region ({T, μB}) and mean transverse momentum (< pT >) of the phase diagram which can be accessed. Tracker (HFT) and Muon Telescope Detector (MTD) upgrades at the STAR experiment at RHIC significantly improved the experimental capabilities of TPC, ToF and EMC detectors in measuring both open and hidden heavy flavor hadrons in heavy-ion collisions
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