Abstract

The Beam Energy Scan Phase II at RHIC, BES-II, is scheduled from year 2019 to 2020 and will explore the high baryon density region of the QCD phase diagram with high precision. The program will focus on the interesting energy region determined from the results of BES-I. Some of the key measurements anticipated are: the net-protons kurtosis that could search for the critical point, the directed flow that might prove a softening of the EOS, and the chiral symmetry restoration in the dilepton channel. The measurements will be possible with the order of magnitude better statistics provided by the electron cooling upgrade of RHIC and with the detector upgrades planned to extend STAR experimental reach. The upgrades are: the inner TPC sectors (iTPC), the Event Plane Detector (EPD), and the end-cap TOF (eTOF). We present the BES-II program details and the physics opportunities enabled by these upgrades.

Highlights

  • The STAR Collaboration proposes a second phase of the Beam Energy Scan program at RHIC

  • The results from BES-I identify the interesting collision energy range below sNN = 20 GeV. These results contain the studies related to the following topics: signature of the quark-gluon plasma (QGP) turn-off [2, 3], the critical point [4, 5], the first-order phase transition [6] and chiral phase transition [7, 8]

  • Combining with the inner TPC sectors (iTPC) upgrade, the end-cap TOF (eTOF) upgrade will provide particle identification capability in forward direction at STAR which is crucial to the Fixed Target program at BES-II

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Summary

Introduction

The STAR Collaboration proposes a second phase of the Beam Energy Scan program at RHIC The Beam Energy Scan Phase I program was proceeded from year 2010 to 2014. From sNN = 200 to 7.7 GeV which are corresponding to baryon chemical potential μB = 20 many interesting results were achieved. The results from BES-I identify the interesting collision energy range below sNN = 20 GeV. These results contain the studies related to the following topics: signature of the QGP turn-off [2, 3], the critical point [4, 5], the first-order phase transition [6] and chiral phase transition [7, 8].

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