tau - Particle Data Group

Citation: K. Nakamura et al. (Particle Data Group), JP G 37, 075021 (2010) and 2011 partial update for the 2012 edition (URL: http://pdg.lbl.gov)
Γ ( π − π 0 ) non-ρ(770)ν τ /Γtotal Γ 15 /Γ
VALUE (%) DOCUMENT ID TECN COMMENT
0.3±0.1 ±0.3 1 BEHREND 84 CELL E ee
cm = 14,22 GeV
1 BEHREND 84 assume a flat nonresonant mass distribution down to the ρ(770) mass,
using events with mass above 1300 to set the level.
Γ ( K − π 0 ) ν τ /Γtotal Γ 16 /Γ
VALUE (%) EVTS DOCUMENT ID TECN COMMENT
0.429±0.015 OUR FIT
0.426±0.016 OUR AVERAGE
0.416±0.003±0.018 78k AUBERT 07AP BABR 230 fb −1 E ee cm = 10.6 GeV
0.471±0.059±0.023 360 ABBIENDI 04J OPAL 1991-1995 LEP runs
0.444±0.026±0.024 923 BARATE 99K ALEP 1991-1995 LEP runs
0.51 ±0.10 ±0.07 37 BATTLE 94 CLEO E ee cm ≈ 10.6 GeV
•••We do not use the following data for averages, fits, limits, etc. •••
0.52 ±0.04 ±0.05 395 BUSKULIC 96 ALEP Repl. by BARATE 99K
Γ ( h − ≥ 2π 0 ) ν τ /Γtotal Γ 17 /Γ
Γ 17 /Γ = (Γ 20 +Γ 23 +Γ 27 +Γ 28 +Γ 30 +0.157Γ 35 +0.157Γ 37 +0.157Γ 40 +0.157Γ 42 +
0.0985Γ 47 +0.319Γ 126 +0.322Γ 128 )/Γ
Data marked “avg” are highly correlated with data appearing elsewhere in the Listings,
and are therefore used for the average given below but not in the overall fits. “f&a”
marks results used for the fit and the average.
VALUE (%) EVTS DOCUMENT ID TECN COMMENT
10.85±0.11 OUR FIT Error includes scale factor of 1.2.
9.91±0.31±0.27 f&a ACKERSTAFF 98M OPAL 1991–1995 LEP runs
•••We do not use the following data for averages, fits, limits, etc. •••
9.89±0.34±0.55 1 AKERS 94E OPAL Repl. by ACKER-
STAFF 98M
14.0 ±1.2 ±0.6 938 2 BEHREND 90 CELL E ee
cm =35GeV
12.0 ±1.4 ±2.5 3 BURCHAT 87 MRK2 E ee
cm =29GeV
13.9 ±2.0 +1.9
−2.2
4 AIHARA 86E TPC E ee
cm =29GeV
1 AKERS 94E not independent of AKERS 94E B(h − ≥ 1π 0 ντ )andB(h − π 0 ν τ )measurements.
2 No independent of BEHREND 90 Γ(h − 2π 0 ντ (exp. K 0 )) and Γ(h − ≥ 3π 0 ν τ ).
3 Error correlated with BURCHAT 87 Γ(ρ − νe )/Γ(total) value.
4 AIHARA 86E (TPC) quote B(2π 0 π − ντ )+1.6B(3π 0 π − ν τ )+1.1B(π 0 ηπ − ν τ ).
Γ ( h − 2π 0 ) ν τ /Γtotal Γ 18 /Γ
Γ 18 /Γ = (Γ 20 +Γ 23 +0.157Γ 35 +0.157Γ 37 )/Γ
VALUE (%) EVTS DOCUMENT ID TECN COMMENT
9.51±0.11 OUR FIT Error includes scale factor of 1.2.
•••We do not use the following data for averages, fits, limits, etc. •••
9.48±0.13±0.10 12k 1 BUSKULIC 96 ALEP Repl. by SCHAEL 05C
1 BUSKULIC 96 quote 9.29 ± 0.13 ± 0.10. We add 0.19 to undo their correction for
τ − → h − K 0 ν τ .
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