pdgLive

τ^{-}

\to

f_{1} (1285) π^{-} ν_{τ}

Decay Mode Summary INSPIRE PDGID:

	Mode ^()*		Fraction ( $Γ_{i}$ / $Γ$ )	Scale Factor/ Conf. Level	P(MeV/c)


$Γ_{171}$	$τ^{-}$ $\to$ $f_{1} (1285) π^{-} ν_{τ}$		( $3.9$ $\pm 0.5$ ) $\times 10^{- 4}$	S=1.9	408

Category:

Miscellaneous other allowed modes

The following data is related to the above value:

Γ (

τ^{-}

\to

f_{1} (1285) π^{-} ν_{τ}) / Γ_{total}

Γ_{171} / Γ

VALUE (

10^{- 4}

)

EVTS

DOCUMENT ID

TECN

COMMENT

3.9 \pm 0.5

OUR AVERAGE Error includes scale factor of 1.9.

4.73

\pm 0.28

\pm 0.45

3.7k

BABR

468 fb

^{- 1} E_{c m}^{e e}

= 10.6 GeV

3.60

\pm 0.18

\pm 0.23

2.5k

BABR

468 fb

^{- 1} E_{c m}^{e e}

= 10.6 GeV

• • We do not use the following data for averages, fits, limits, etc. • •

3.19

\pm 0.18

\pm 1.00

1.3 k

BABR

Repl. by LEES 2012X

3.9

\pm 0.7

\pm 0.5

1.4 k

BABR

Repl. by LEES 2012X

5.8

_{- 1.3}^{+ 1.4}

\pm 1.8

54

CLEO

E_{c m}^{e e}

=

10.6

GeV

¹	LEES 2012X obtain this value by dividing their B( $τ^{-}$ $\to$ $f_{1} (1285) π^{-} ν_{τ}$ $\to$ 3 $π^{-}$ 2 $π^{+} ν_{τ}$ ) measurement by the PDG 2012 value of B( $f_{1} (1285)$ $\to$ 2 $π^{+}$ 2 $π^{-}$ ) = $0.111$ $_{- 0.006}^{+ 0.007}$ .

²	LEES 2012X obtain this value by dividing their B( $τ^{-}$ $\to$ $f_{1} (1285) π^{-} ν_{τ}$ $\to$ $η π^{-} π^{+} π^{-} ν_{τ}$ ) measurement by 2/3 of the PDG 2012 value of B( $f_{1} (1285)$ $\to$ $η π π$ ) = $0.524$ $_{- 0.021}^{+ 0.019}$ .

³

AUBERT 2008AE obtain this value by dividing their B(

τ^{-}

\to

f_{1} (1285) π^{-} ν_{τ}

\to

η π^{-} π^{+} π^{-} ν_{τ}

) measurement by the PDG 2006 value of B(

f_{1} (1285)

\to

η π^{-} π^{+}

) =

0.35

\pm 0.11

. The quote (

3.19

\pm 0.18

\pm 0.16

\pm 0.99

)

\times 10^{- 4}

where the final error is due to the uncertainty on B(

f_{1} (1285)

\to

η π^{-} π^{+}

). We combine the two systematic errors in quadrature.

⁴	AUBERT,B 2005W use the $f_{1} (1285)$ $\to$ 2 $π^{+}$ 2 $π^{-}$ decay mode and the PDG 2004 value of B( $f_{1} (1285)$ $\to$ 2 $π^{+}$ 2 $π^{-}$ ) = $0.110$ $_{- 0.006}^{+ 0.007}$ .

⁵	BERGFELD 1997 use the $f_{1} (1285)$ $\to$ $η π^{+} π^{-}$ decay mode.

PR D86 092010

Study of High-Multiplicity Three-Prong and Five-Prong

τ

Decays at BABAR

PR D77 112002

Measurement of the

τ^{-}

\to

η π^{-} π^{+} π^{-} ν_{τ}

Branching Fraction and a Search for a Second-Class Current in the

τ^{-}

\to

η^{^{'}} (958) π^{-} ν_{τ}

Decay

PR D72 072001

Study of the

τ^{-}

\to

3

h^{-}

2

h^{+} ν_{τ}

Decay

PRL 79 2406

First Observation of

τ

\to

3

π η ν_{τ}

and

τ

\to

f_{1} (1285) π ν_{τ}

Decays

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