Search for Pair Production of t*-> t + photon : Estimation of Photon Purity and Study of the Top and W Mass Resolution

• Main Authors: Fang-Ying Tsai, 蔡芳英
• Other Authors: Shin-Shan Yu
• Format: Others
• Language: en_US
• Published: 2013
• Online Access: http://ndltd.ncl.edu.tw/handle/87816640714065660091

碩士 === 國立中央大學 === 物理學系 === 101 === Randall-Sundrum model provides a reasonable way to explain the hierarchy problem and it predicts the lightest spin-3/2 Kaluza-Klein particle. We are searching for the singlet top of spin-3/2 through pair-production that may be produced at LHC energies. This thesis presents the χ^2 sorting method, which includes studies of mass resolution and the probability of getting correct solution of neutrino pz to reconstruct spin-3/2 particle at √s=8 TeV using 19.6 fb^(-1)of proton-proton collision data collected by CMS. In order to estimate dominated background in data, we also provide two methods, χ^2 fitter and Likelihood fitter. These methods use inclusive photon at √s=7 TeV and the data sample corresponds from 2.4 to 35.9 pb^(-1).