منابع مشابه
Summary on Tau Leptonic Branching Ratios and Universality
The large samples of τ decays available from CLEO and the four LEP experiment have resulted in new, precise measurements of the leptonic branching ratios of the τ . The experimental techniques to obtain these results are reviewed with special emphasis on the DELPHI measurement. World averages are found to be B(τ → eνν̄) = (17.81 ± 0.06%) and B(τ → μνν̄) = (17.36 ± 0.06%). These results are consis...
متن کاملMeasurement of tau branching ratios.
Using the data accumulated at LEP in 1989 and 1990 with the A L E P H detector, the inclusive and exclusive branching ratios o f the r lepton have been measured assuming lepton universality in Z ~ decays. The inclusive branching fractions for the r decay into one, three, and five charged particles have been determined to be (85.45 _+ 0.97)%, (14.35 _+ 0.48)%, and (0.10 _+ 0.05)%, respectively, ...
متن کاملPrecise measurements of the leptonic branching ratios of the tau lepton.
Precise measurements are reported for the leptonic branching ratios of the T lepton from the reaction e+e+ T+Tobserved with the MAC detector operating at PEP. Results from samples in which one T decays into three charged particles and the other to e or /,L are B, = 0.180 f 0.009 f 0.006 and B, = 0.183f0.009f0.005. A sample of ep events gives Be-B, = 0.0288f0.0017f0.0019. With the assumption of ...
متن کاملMeasurement of tau lifetime and branching ratios.
Precise results are reported for the T lepton lifetime and several I branching ratios obtained with the MAC detector operating at PEP at JS = 29 GeV. We find T ~=(3.15?0.36?0.41~10-~~ sec. Results for the topological branching ratios Bl, Bs, 8s (7 decaying into 1, 3, 5 charged particles) are B+l-8~=0.133~0.003~0.006 and B5<0.0017 at the 95% confidence level. The fraction of all 3-prong decays u...
متن کاملBeauty Semileptonic Branching Ratios
Recent measurements of inclusive and exclusive semileptonic b branching ratios are reviewed. Model-independent analyses from ARGUS and CLEO connrm the value B(b ! ``X) = 10:4%, while new analyses from ALEPH obtain higher values above 11%. The diierence is not consistent with measured values of b hadron lifetime. New measurements of B(B ! D ? ``) from CLEO and ALEPH are in good agreement. First ...
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ژورنال
عنوان ژورنال: Zeitschrift f�r Physik C Particles and Fields
سال: 1996
ISSN: 0170-9739,1431-5858
DOI: 10.1007/s002880050133