CaltechAUTHORS
Published January 1, 1996 | Version Published
Journal Article Open

Measurement of the mass of the τ lepton

Creators

Abstract

A data-driven energy scan in the immediate vicinity of the τ pair production threshold has been performed using the Beijing Spectrometer at the Beijing Electron-Positron Collider. Approximately 5 pb^(-1) of data, distributed over 12 scan points, have been collected. A previous mass value for the τ lepton, obtained using only the eμ final state, has been published. In this paper, the final BES result on the mass measurement is presented. The analysis is based on the combined data from the ee, eμ, eh, μμ, μh, and hh final states, where h denotes a charged π or K. A maximum likelihood fit to the τ pair production cross section data yields the value m_τ=1776.96_(-0.21)-0.17^(+0.18+0.25) MeV.

Additional Information

© 1996 The American Physical Society. Received 25 July 1995; published in the issue dated 1 January 1996. The BES Collaboration would like to thank the staffs of the BEPC accelerator and the Computing Center at the Institute of High Energy Physics, Beijing, for their outstanding efforts, and also Y. S. Tsai for helpful discussions about the T^+T^- cross section near threshold. The work of the BES Collaboration was supported in part by the National Natural Science Foundation of China under Contract No. 19290400 and the Chinese Academy of Sciences under Contract NO. KJ85 (IHEP), by the Department of Energy under Contracts No. DE-FG02.91ER40676 (Boston University), DE-FG03-92ER40701 (California Institute of Technology), DEFG03-93ER40788 (Colorado State University), DE-AC02-76ER03069 (MIT), DE-AC03- 76SF00515 (SLAC), DE-FG03-91ER40679 (University of California at Irvine), DE-FG03-94ER40833 (University of Hawaii), DE-FG05-92ER40736 (University of Texas at Dallas), DE-AC35-89ER40486 (SSC Lab), by the U.S. National Science Foundation, Grant No. PHY9203212 (University of Washington), and by the Texas National Research Laboratory Commission under Contracts Nos. RGFYQlB5, RGFY92B5 (Colorado State), and RCFY93-316H (University of Texas at Dallas).

Attached Files

Published - BAIprd96a.pdf

Files

BAIprd96a.pdf

Files (1.2 MB)

Name Size
md5:b7735dac2012c8287178f5aea0e1f9bf
1.2 MB Preview Download

Additional details

Identifiers

Eprint ID
29168
Resolver ID
CaltechAUTHORS:20120207-103219967

Funding

National Natural Science Foundation of China
19290400
Chinese Academy of Sciences
KJ85
Department of Energy (DOE)
DE-FG02.91ER40676
Department of Energy (DOE)
DE-FG03-92ER40701
Department of Energy (DOE)
DEFG03-93ER40788
Department of Energy (DOE)
DE-AC02-76ER03069
Department of Energy (DOE)
DE-AC03-76SF00515
Department of Energy (DOE)
DE-FG03-91ER40679
Department of Energy (DOE)
DE-FG03-94ER40833
Department of Energy (DOE)
DE-FG05-92ER40736
Department of Energy (DOE)
DE-AC35-89ER40486
NSF
PHY9203212
Texas National Research Laboratory Commission
RGFY91B5
Texas National Research Laboratory Commission
RGFY92B5
Texas National Research Laboratory Commission
RCFY93-316H

Dates

Created
2012-02-07
Created from EPrint's datestamp field
Updated
2021-11-09
Created from EPrint's last_modified field