The STAR Detector Upgrades and Electromagnetic Probes in Beam Energy Scan Phase II

C Yang

doi:10.1142/s2010194518600091

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 chiral symmetry restoration and QGP thermal radiation in the dilepton and direct photon channels. The measurements will be possible with an 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 Time Projection Chamber sectors (iTPC), the Event Plane Detector (EPD), and the end-cap Time of Flight (eTOF). We present the BES-II program details and the physics opportunities in the dilepton and direct photon channels enabled by the upgrades.

Highlights

The STAR Collaboration proposes a second phase of the Beam Energy Scan program at RHIC (BES-II) to explore the QCD phase structure 1 in the years 2019 to 2020
The first new inner sector has been installed in STAR detector and will be commissioned in the coming RHIC run
Combined with the inner Time Projection Chamber sectors (iTPC) upgrade, the end-cap Time of Flight (eTOF) upgrade will provide particle identification capability in forward direction at STAR which is crucial to the Fixed Target program at BES-II

Summary

Introduction

The STAR Collaboration proposes a second phase of the Beam Energy Scan program at RHIC (BES-II) to explore the QCD phase structure 1 in the years 2019 to 2020. Particular interesting 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. This is an Open Access article published by World Scientific Publishing Company. The first new inner sector has been installed in STAR detector and will be commissioned in the coming RHIC run For this sector, the local test on the MWPC showed qualified energy resolution (20% FWHM) in P10 gas as demonstrated in FIG.

The STAR Detector Upgrades and Electromagnetic Probes

Findings

Rapp calculation