Measurement of production in p+p collisions at = 500 GeV in the STAR experiment

Hot Quarks 2014: Workshop for young scientists on the physics of ultrarelativistic nucleus-nucleus collisions

Kosarzewski, Leszek^1

Warsaw University of Technology, Koszykowa 75, Warsaw

00-662, Poland^1

关键词: Au+Au collisions;    High-precision;    Muon telescope detector;    Nuclear matters;    Nuclear modification factors;    Quark-gluon plasma;    Secondary production;    STAR experiment;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/612/1/012022/pdf
DOI  :  10.1088/1742-6596/612/1/012022

来源: IOP

【 摘 要 】

Quarkonium suppression was proposed as a signature of the quark-gluon plasma (QGP) formation. Different members of the quarkonium family are expected to melt at different temperatures providing an estimate of the temperature reached in the QGP. The Υ states offer a clean probe of the QGP, thanks to small secondary production and cold nuclear matter effects. Previous measurements at RHIC focused on colliding system and centrality dependence of Υ nuclear modification factor RAA. The Υ RAAas a function of pTwill provide additional information about Υ interaction with the QGP, which requires a pTspectrum in p+p collisions as a baseline. Measurement of the Υ pTspectrum in p+p collisions at √s = 500 GeVmay provide such a baseline with high precision. It can be rescaled based on pQCD calculations and used as a baseline for Au+Au collisions at √sNN= 200 GeV. In this paper, the status of Υ measurements in p+p collisions at √s = 500 GeVin the STAR experiment is presented. In addition, with the help of the newly installed Muon Telescope Detector (MTD) it will be possible to measure Υ 1S, 2S and 3S states separately.