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)
•••We do not use the following data for averages, fits, limits, etc. •••
25.76 ±0.15 ±0.13 31k BUSKULIC 96 ALEP Repl. by SCHAEL 05C
25.98 ±0.36 ±0.52 3 AKERS 94E OPAL Repl. by ACKER-
STAFF 98M
22.9 ±0.8 ±1.3 283 4 ABREU 92N DLPH E ee
cm =88.2–94.2 GeV
23.1 ±0.4 ±0.9 1249 5 ALBRECHT 92Q ARG E ee
cm =10GeV
25.02 ±0.64 ±0.88 1849 DECAMP 92C ALEP 1989–1990 LEP runs
22.0 ±0.8 ±1.9 779 ANTREASYAN 91 CBAL E ee cm =9.4–10.6 GeV
22.6 ±1.5 ±0.7 1101 BEHREND 90 CELL E ee cm =35GeV
23.1 ±1.9 ±1.6 BEHREND 84 CELL E ee cm = 14,22 GeV
1 See footnote to ABDALLAH 06A Γ(τ − → h − ντ )/Γ total measurement for correlations
with other measurements.
2 ARTUSO 94 reports the combined result from three independent methods, one of which
(23% of the τ − → h − π 0 ν τ ) is normalized to the inclusive one-prong branching fraction,
taken as 0.854 ± 0.004. Renormalization to the present value causes negligible change.
3 AKERS 94E quote (26.25 ± 0.36 ± 0.52) × 10 −2 ; we subtract 0.27% from their number
to correct for τ − → h − K 0 L ν τ .
4 ABREU 92N with 0.5% added to remove their correction for K ∗ (892) − backgrounds.
5 ALBRECHT 92Q with 0.5% added to remove their correction for τ − → K ∗ (892) − ντ
background.
Γ ( π − π 0 ) ν τ /Γtotal Γ 14 /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
25.51 ±0.09 OUR FIT Error includes scale factor of 1.1.
25.46 ±0.12 OUR AVERAGE
25.471±0.097±0.085 f&a 81k 1 SCHAEL 05C ALEP 1991-1995 LEP runs
•••We use the following data for averages but not for fits. •••
25.36 ±0.44 avg 2 ARTUSO 94 CLEO E ee
cm =10.6 GeV
•••We do not use the following data for averages, fits, limits, etc. •••
25.30 ±0.15 ±0.13 3 BUSKULIC 96 ALEP Repl. by
SCHAEL 05C
21.5 ±0.4 ±1.9 4400 4,5 ALBRECHT 88L ARG E ee
cm =10GeV
23.0 ±1.3 ±1.7 582 ADLER 87B MRK3 E ee cm =3.77GeV
25.8 ±1.7 ±2.5 6 BURCHAT 87 MRK2 E ee
cm =29GeV
22.3 ±0.6 ±1.4 629 5 YELTON 86 MRK2 E ee
cm =29GeV
1 See footnote to SCHAEL 05C Γ(τ − → e − νe ν τ )/Γ total measurement for correlations
with other measurements.
2 Not independent of ARTUSO 94 B(h − π 0 ντ ) and BATTLE 94 B(K − π 0 ν τ )values.
3 Not independent of BUSKULIC 96 B(h − π 0 ντ )andB(K − π 0 ν τ )values.
4 The authors divide by ( Γ3 +Γ 5 +Γ 9 +Γ 10 )/Γ = 0.467 to obtain this result.
5 Experiment had no hadron identification. Kaon corrections were made, but insufficient
information is given to permit their removal.
6 BURCHAT 87 value is not independent of YELTON 86 value. Nonresonant decays
included.
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