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Citation: K. Nakamura et al. (<strong>Particle</strong> <strong>Data</strong> <strong>Group</strong>), JP G 37, 075021 (2010) and 2011 partial update for the 2012 edition (URL: http://pdg.lbl.gov)<br />
5 Modified using B(e − νe ν τ )/B(“1 prong”) and B(“1 prong”) ,= 0.855.<br />
6<br />
(<br />
Error correlated with BALTRUSAITIS 85 Γ μ −<br />
)<br />
νμ ν τ /Γtotal .<br />
7 BACINO 78B value comes from fit to events with e ± and one other nonelectron charged<br />
prong.<br />
Γ ( μ − ) (<br />
ν μ ν τ /Γ e − )<br />
ν e ν τ<br />
Standard Model prediction including mass effects is 0.9726.<br />
VALUE EVTS DOCUMENT ID TECN COMMENT<br />
0.9762±0.0031 OUR FIT Error includes scale factor of 1.1.<br />
Γ 3 /Γ 5<br />
0.979 ±0.004 OUR AVERAGE<br />
0.9796±0.0016±0.0036 731k 1 AUBERT 10F BABR 467 fb −1 E ee cm = 10.6 GeV<br />
0.9777±0.0063±0.0087 2 ANASTASSOV 97 CLEO E ee<br />
cm =10.6 GeV<br />
0.997 ±0.035 ±0.040 ALBRECHT 92D ARG E ee cm =9.4–10.6 GeV<br />
1 Correlation matrix for AUBERT 10F branching fractions:<br />
(1) Γ(τ − → μ − ν μ ν τ )/Γ(τ − → e − ν e ν τ )<br />
(2) Γ(τ − → π − ν τ )/Γ(τ − → e − ν e ν τ )<br />
(3) Γ(τ − → K − ν τ )/Γ(τ − → e − ν e ν τ )<br />
(1) (2)<br />
(2) 0.25<br />
(3) 0.12 0.33<br />
2 The correlation coefficients between this measurement and the ANASTASSOV 97 measurements<br />
of B(μν μ ν τ ), B(e ν e ν τ ), B(h − ν τ ), and B(h − ν τ )/B(e ν e ν τ ) are 0.58,<br />
−0.42, 0.07, and 0.45 respectively.<br />
Γ ( e − ν e ν τ γ ) /Γ total Γ 6 /Γ<br />
VALUE (%) DOCUMENT ID TECN COMMENT<br />
1.75±0.06±0.17 1 BERGFELD 00 CLEO E ee<br />
cm =10.6 GeV<br />
1 BERGFELD 00 impose requirements on detected γ’s corresponding to a τ-rest-frame<br />
energy cutoff E ∗ > 10 MeV.<br />
γ<br />
Γ ( h − ≥ 0K 0 L ν ) τ /Γtotal Γ 7 /Γ<br />
Γ 7 /Γ = (Γ 9 +Γ 10 + 1 2 Γ 35 + 1 2 Γ 37 +Γ 47 )/Γ<br />
<strong>Data</strong> marked “avg” are highly correlated with data appearing elsewhere in the Listings,<br />
and are therefore used for the average given below but not in the overall fits. “f&a”<br />
marks results used for the fit and the average.<br />
VALUE (%) EVTS DOCUMENT ID TECN COMMENT<br />
12.13±0.07 OUR FIT Error includes scale factor of 1.1.<br />
12.2 ±0.4 OUR AVERAGE<br />
12.47±0.26±0.43 f&a 2967 1 ACCIARRI 95 L3 1992 LEP run<br />
12.4 ±0.7 ±0.7 f&a 283 2 ABREU 92N DLPH 1990 LEP run<br />
12.1 ±0.7 ±0.5 f&a 309 ALEXANDER 91D OPAL 1990 LEP run<br />
•••We use the following data for averages but not for fits. •••<br />
11.3 ±0.5 ±0.8 avg 798 3 FORD 87 MAC E ee<br />
cm =29GeV<br />
HTTP://PDG.LBL.GOV Page 19 Created: 6/16/2011 12:05
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