Tau mass measurement at BESIII

by Dr MO Xiaohu (IHEP, China)

Thursday May 10, 2012, 3:30 AM → 4:30 AM Pacific/Honolulu

417 (Watanabe Hall)

As one of three elementary charged leptons in nature, the precision of the tau mass is almost four orders of magnitude lower than those of the electron and muon, whose precision is at the level of 10^(-8). Further improvement of the precision of the tau mass is of great important for particle physics. Moreover, the tau mass is a very important quantity in testing lepton-universality. The new experiment at BESIII aims at an uncertainty of less than 0.1 MeV for the tau mass, or 6x10^–6 for the relative error. To reach this goal, an optimization study is performed to determine the best strategy for the data taking. The scan experiment will be explained, and a brief description of the data analysis will be presented.