Optimization of the data taking strategy for a high precision mass measurement

To achieve a high precision τ mass ( m τ ) measurement at the forthcoming high luminosity experiment, Monte Carlo simulation and sampling technique are adopted to simulate various data taking cases from which the optimal scheme is determined. The study indicates that when m τ is the sole parameter to be fit, the optimal energy for data taking is located near the τ + τ - production threshold in the vicinity of the largest derivative of the cross-section to energy; one point in the optimal position with luminosity around 63 pb - 1 is sufficient for getting a statistical precision of 0.1 MeV / c 2 or better.