Measurement of the mass of the τ lepton

Creators: Bai, J. Z.; Hatanaka, M.; Hitlin, D. G.; Jones, L. A.; Kelsey, M. H.; Panetta, J. H.; Porter, F. C.; Prabhakar, E. N.; BES Collaboration

Abstract

The mass of the τ lepton has been measured at the Beijing Electron-Positron Collider using the Beijing Spectrometer. A search near threshold for e^+e^-→τ^+τ^- was performed. Candidate events were identified by requiring that one τ decay via τ→eνν¯, and the other via τ→μνν¯. The mass value, obtained from a fit to the energy dependence of the τ^+τ^- cross section, is m_τ=1776.9_(-0.5)^(+0.4)±0.2 MeV.

Additional Information

© 1992 The American Physical Society. Received 7 August 1992. We would like to thank the BEPC staff and the Computer Center at IHEP for their outstanding efforts, and also Y. S. Tsai and J. M. Wu for helpful discussions about the r ^+ r ^- cross section near threshold. This work was supported in part by the National Natural Science Foundation of China under Contract No. 19290400 OHEP); by the Department of Energy under Contracts No. DE-AC03-76SF00515 (SLAC), No. DE-FG03- 92ER40701 (Caltech), No. DE-FG03-91 ER40679 (UC Irvine), No. DE-FG02-91 ER40676 (Boston University), No. DE-AC02-76ER03069 (MIT), No. DE-AC35- 89ER40486 (SSC), and No. DE-FG05-92ER40736 (UT Dallas); by the Texas National Research Laboratory Commission (Rocky Mountain Consortium for High Energy Physics) under Contracts No. RGFY91 85 and No. RGFY9285 (Colorado State); and by the National Science Foundation (University of Washington).

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