Abstract
A new measurement of the τ lifetime is presented. It uses data collected with the OPAL detector during 1994, which almost doubles the size of the OPAL τ sample. Two statistically independent techniques are used: an impact parameter analysis of one-prong decay tracks and a fit to the decay length distribution of three-prong decays. The lifetime obtained from the 1994 data by combining the results of these methods is ττ = 289.7 ± 2.5(stat) ± 1.5(sys) fs. When combined with the previous OPAL τ lifetime measurement the improved τ lifetime is ττ = 289.2 ± 1.7(stat.) ± 1.2(sys.) fs.
Original language | English |
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Pages (from-to) | 341-350 |
Number of pages | 10 |
Journal | Physics Letters B |
Volume | 374 |
Issue number | 4 |
DOIs | |
State | Published - May 9 1996 |
Externally published | Yes |
Funding
It is a pleasure to thank the SL Division for the efficient operationo f the LEP accelerator,t he precise information on the absolutee nergy, and their continuing close cooperation with our experimentalg roup. In addition to the supports taff at our own institutions we are pleasedt o acknowledget he Departmento f Energy, USA, National Science Foundation, USA, Particle Physics and Astronomy Research Council, UK Natural Sciences and Engineering ResearchC ouncil, Canada, Israel Ministry of Science, Israel Science Foundation, administeredb y the Israel Academy of Science and Humanities, Minerva Gesellschaft, Japanese Ministry of Education, Science and Culture (the Monbusho) and a grant under the Monbusho International Science ResearchP rogram, German Israeli Bi-national Science Foundation (GIF), Direction des Sciencesd e la Mat&e du Commissariat a I’Energie Atomique, France, Bundesministerium fur Bildung, Wissenschaft, Forschung und Technologie, Germany, National ResearchC ouncil of Canada, Hungarian Foundation for Scientific Research,O TKA T-016660. and OTKA F-015089.
Funders | Funder number |
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Direction des Sciencesd e la Mat&e du Commissariat a I’Energie Atomique, France, Bundesministerium fur Bildung, Wissenschaft, Forschung und Technologie | |
German Israeli Bi-national Science Foundation | |
Hungarian Foundation for Scientific Research | OTKA F-015089, O TKA T-016660 |
Israel Ministry of Science, Israel Science Foundation | |
Minerva Gesellschaft | |
Monbusho International Science ResearchP rogram | |
National ResearchC ouncil of Canada | |
Natural Sciences and Engineering ResearchC ouncil | |
National Science Foundation | |
U.S. Department of Energy | |
Ministry of Education, Culture, Sports, Science and Technology | |
Israel Academy of Sciences and Humanities |