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 ( h − ) ( ων τ /Γ h − h − h + π 0 ν τ (ex.K 0 ) ) Γ 150 /Γ 66
Γ 150 /Γ 66 =Γ 150 /(Γ 70 +Γ 89 +Γ 94 +0.226Γ 128 +0.888Γ 150 +0.017Γ 152 )
VALUE EVTS DOCUMENT ID TECN COMMENT
0.437±0.017 OUR FIT Error includes scale factor of 1.2.
0.453±0.019 OUR AVERAGE
0.431±0.033 2350 1 BUSKULIC 96 ALEP LEP 1991–1993 data
0.464±0.016±0.017 2223 2 BALEST 95C CLEO E ee
cm ≈ 10.6 GeV
•••We do not use the following data for averages, fits, limits, etc. •••
0.37 ±0.05 ±0.02 458 3 ALBRECHT 91D ARG E ee
cm =9.4–10.6 GeV
1 BUSKULIC 96 quote the fraction of τ → h − h − h + π 0 ντ (ex. K 0 ) decays which
originate in a h − ω final state = 0.383 ± 0.029. We divide this by the ω(782) →
π + π − π 0 branching fraction (0.888).
2 BALEST 95C quote the fraction of τ − → h − h − h + π 0 ντ (ex. K 0 ) decays which
originate in a h − ω final state equals 0.412 ± 0.014 ± 0.015. We divide this by the
ω(782) → π + π − π 0 branching fraction (0.888).
3 ALBRECHT 91D quote the fraction of τ − → h − h − h + π 0 ντ decays which originate in
a π − ω final state equals 0.33 ± 0.04 ± 0.02. We divide this by the ω(782) → π + π − π 0
branching fraction (0.888).
Γ ( K − ) ων τ /Γtotal Γ 151 /Γ
VALUE (units 10 −4 ) EVTS DOCUMENT ID TECN COMMENT
4.1±0.6±0.7 500 ARMS 05 CLE3 7.6 fb −1 , E ee cm =10.6 GeV
Γ ( h − ωπ 0 ) ν τ /Γtotal Γ 152 /Γ
VALUE (%) EVTS DOCUMENT ID TECN COMMENT
0.41±0.04 OUR FIT
0.43±0.06±0.05 7283 BUSKULIC 97C ALEP 1991–1994 LEP runs
Γ ( h − ωπ 0 ) (
ν τ /Γ h − h − h + ≥ 0neutrals ≥ 0K 0 L ν )
τ
Γ 152 /Γ 54
Γ 152 /Γ 54 =Γ 152 /(0.3431Γ 35 +0.3431Γ 37 +0.3431Γ 40 +0.3431Γ 42 +0.4307Γ 47 +
0.6861Γ 48 +Γ 62 +Γ 70 +Γ 77 +Γ 78 +Γ 85 +Γ 89 +Γ 93 +Γ 94 +0.285Γ 126 +0.285Γ 128 +
0.9101Γ 150 +0.9101Γ 152 )
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
0.0270±0.0028 OUR FIT
•••We use the following data for averages but not for fits. •••
0.028 ±0.003 ±0.003 avg 430 1 BORTOLETTO93 CLEO E ee
cm ≈ 10.6 GeV
1 Not independent of BORTOLETTO 93 Γ(τ − → h − ωπ 0 ντ )/Γ(τ − →
h − h − h + 2π 0 ν τ (ex.K 0 )) value.
Γ ( h − ωπ 0 ) ( ν τ /Γ h − h − h + 2π 0 ν τ (ex.K 0 ) ) Γ 152 /Γ 76
Γ 152 /Γ 76 =Γ 152 /(Γ 77 +0.226Γ 126 +0.888Γ 152 )
VALUE DOCUMENT ID TECN COMMENT
0.83±0.08 OUR FIT
0.81±0.06±0.06 BORTOLETTO93 CLEO E ee cm ≈ 10.6 GeV
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