Measurement of the tau lepton mass by the Beijing Spectrometer (BES) Collaboration

Conference · Sun Nov 01 04:00:00 EST 1992

DOI:https://doi.org/10.2172/10105275· OSTI ID:6990329

Soderstrom, E

The mass of the [tau] lepton has been measured at the Beijing Electron Positron Collider using the Beijing Spectrometer. A search near threshold for e[sup +]e[sup [minus]] [yields] [tau][sup +][tau][sup [minus]] was performed. Candidate events were identified by requiring that one [tau] decay via [tau] [yields] e[nu][bar [nu]], and the other via [tau] [yields] [mu][nu][bar [nu]]. The mass value, obtained from a fit to the energy dependence of the [tau][sup +][tau][sup [minus]] cross section, is m[sub [tau]] = 1776.9[sub -0.5][sup +0.4] [plus minus] 0.2 MeV.

• Research Organization: Stanford Linear Accelerator Center, Menlo Park, CA (United States)
• Sponsoring Organization: DOE; USDOE, Washington, DC (United States)
• DOE Contract Number: AC03-76SF00515
• OSTI ID: 6990329
• Report Number(s): SLAC-PUB-6002; CONF-9207140--2; ON: DE93004628
• Country of Publication: United States
• Language: English

Related Subjects

662430* -- Properties of Leptons-- (1992-)
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BASIC INTERACTIONS
BRANCHING RATIO
CROSS SECTIONS
DATA
DECAY
ELECTRON-POSITRON INTERACTIONS
ELEMENTARY PARTICLES
ERRORS
EXPERIMENTAL DATA
FERMIONS
HEAVY LEPTONS
INFORMATION
INTERACTIONS
LEPTON-LEPTON INTERACTIONS
LEPTONIC DECAY
LEPTONS
MASS
MATRIX ELEMENTS
MAXIMUM-LIKELIHOOD FIT
MEASURING INSTRUMENTS
NUMERICAL DATA
NUMERICAL SOLUTION
PARTICLE DECAY
PARTICLE INTERACTIONS
PARTICLE PRODUCTION
POSTULATED PARTICLES
REST MASS
SPECTROMETERS
TAU PARTICLES
WEAK INTERACTIONS
WEAK PARTICLE DECAY