A new multivariate method and study psi(2S) via J/psi +pi pi final state in pp collisions at 200 GeV at STAR

• Main Authors: Feng-HanChang, 張峰瀚
• Other Authors: Yi Yang
• Format: Others
• Language: en_US
• Published: 2018
• Online Access: http://ndltd.ncl.edu.tw/handle/3a5324

碩士 === 國立成功大學 === 物理學系 === 106 === The Solenoid Tracker At RHIC (STAR) is one of the major high energy nuclear physics experiments in the Relativistic Heavy Ion Collider (RHIC) at Brookhaven National Laboratory (BNL). In 2014, a new subsystem, Muon Telescope Detector (MTD), was completely installed in the STAR experiment. This provides us an excellent opportunity to study heavy quarkonia physics via the dimuon channel. In this thesis, we presented a new developed multivariate method called “Distance Method” to distinguish signal candidates from large background events, and the study of psi(2S) via the J/psi+pi pi final state in the proton-proton collisions at sqrt(s) = 200 GeV by using a new variable called “G” to increase the signal to noise ratio.