Search for superpartner of electron and muon in the e[+]e[-] reactions up to the √s of 61.4 GeV 重心系エネルギー61.4Gev以下での電子陽電子反応における電子およびミュー粒子の超対称性粒子探索

博士論文

An experimental search for scalar electron and scalar muon, the super-symmetric partner of electron and muon, has been performed at TRISTAN e+e- collider at the National Laboratory of High Energy Physics, using the VENUS detector. The study has been made at center-of-mass energies from 55 to 61.4GeV with an integrated luminosity of 29.2pb-1. No events which are due to scalar electron or scalar muon are observed and lower mass limits are obtained as functions of photino mass.

Contents / p1 1 Introduction / p3 　1.1 Standard model / p3 　1.2 Supersymmetry / p7 　1.3 Two-photon process / p11 2 Experimental Procedure / p13 　2.1 TRISTAN Accelerator / p13 　2.2 VENUS detector / p15 3 Trigger system / p24 　3.1 First-level trigger / p25 　3.2 Second-level trigger / p41 4 Data Analysis / p44 　4.1 Pre-selection / p44 　4.2 Electron-pair event selection / p48 　4.3 Muon-pair event selection / p49 　4.4 Selection for heavy stable particles / p50 　4.5 Luminosity measurement / p51 5 Results and Discussion / p53 　5.1 Background for two-photon process / p53 　5.2 Lepton production from two-photon collision / p58 　5.3 Search for superpartner / p63 6 Conclusion / p77 A Look-up table / p82 B Two-track limited trigger modules / p84 C Beam test of hadron response in the LG calorimeter / p86