pdgLive

${{\mathit \tau}}$ MEAN LIFE

VALUE ($ 10^{-15} $ s)

EVTS

DOCUMENT ID

TECN

COMMENT

$\bf{ 290.3 \pm0.5}$

OUR AVERAGE

$290.17$ $\pm0.53$ $\pm0.33$

1.1M

BELL

711 fb${}^{-1}{\it{}E}^{\it{}ee}_{\rm{}cm}$=10.6 GeV

$290.9$ $\pm1.4$ $\pm1.0$

DLPH

1991-1995 LEP runs

$293.2$ $\pm2.0$ $\pm1.5$

L3

1991--1995 LEP runs

$290.1$ $\pm1.5$ $\pm1.1$

ALEP

1989--1994 LEP runs

$289.2$ $\pm1.7$ $\pm1.2$

OPAL

1990--1994 LEP runs

$289.0$ $\pm2.8$ $\pm4.0$

57.4k

CLEO

${\it{}E}^{\it{}ee}_{\rm{}cm}$= $10.6$ GeV

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

$291.2$ $\pm2.0$ $\pm1.2$

ALEP

Repl. by BARATE 1997R

$291.4$ $\pm3.0$

DLPH

Repl. by ABDALLAH 2004T

$290.1$ $\pm4.0$

34k

L3

Repl. by ACCIARRI 2000B

$297$ $\pm9$ $\pm5$

1671

SLD

1992--1993 SLC runs

$304$ $\pm14$ $\pm7$

4100

CLEO

${\it{}E}^{\it{}ee}_{\rm{}cm}$= $10.6$ GeV

$301$ $\pm29$

3780

JADE

${\it{}E}^{\it{}ee}_{\rm{}cm}$= 35$-$46 GeV

$288$ $\pm16$ $\pm17$

807

MRK2

${\it{}E}^{\it{}ee}_{\rm{}cm}$= 29 GeV

$306$ $\pm20$ $\pm14$

695

TASS

${\it{}E}^{\it{}ee}_{\rm{}cm}$= 36 GeV

$299$ $\pm15$ $\pm10$

1311

HRS

${\it{}E}^{\it{}ee}_{\rm{}cm}$= 29 GeV

$295$ $\pm14$ $\pm11$

5696

ARG

${\it{}E}^{\it{}ee}_{\rm{}cm}$= 9.3$-$10.6 GeV

$309$ $\pm17$ $\pm7$

3788

MAC

${\it{}E}^{\it{}ee}_{\rm{}cm}$= 29 GeV

$325$ $\pm14$ $\pm18$

8470

CLEO

${\it{}E}^{\it{}ee}_{\rm{}cm}$= 10.5 GeV

$460 \pm190$

102

MRK2

${\it{}E}^{\it{}ee}_{\rm{}cm}$= 29 GeV

References:

PRL 112 031801

Measurement of the ${{\mathit \tau}}$ -lepton Lifetime at Belle

EPJ C36 283

A Precise Measurement of the ${{\mathit \tau}}$ Lifetime

PL B479 67

Measurement of the Lifetime of the ${{\mathit \tau}}$ Lepton

PL B414 362

Updated Measurement of the ${{\mathit \tau}}$ Lepton Lifetime

ZPHY C74 387

Measurement of the ${{\mathit \tau}}$ Lepton Lifetime with the Three-Dimensional Impact Parameter Method

PL B365 448

A Precise Measurement of the ${{\mathit \tau}}$ Lepton Lifetime

PL B389 187

Measurement of the Lifetime of the ${{\mathit \tau}}$ Lepton

PL B374 341

Improved Measurement of the Lifetime of the ${{\mathit \tau}}$ Lepton

PL B388 402

Measurement of the ${{\mathit \tau}}$ Lepton Lifetime

PR D52 4828

Measurement of the ${{\mathit \tau}}$ Lifetime at SLD

PL B291 488

A Measurement of the ${{\mathit \tau}}$ Lepton Lifetime

ZPHY C42 7

A Measurement of the ${{\mathit \tau}^{\pm}}$ Lepton Lifetime

PR D37 1750

Measurement of the ${{\mathit \tau}^{\pm}}$ Lifetime

ZPHY C39 331

A Measurement of the ${{\mathit \tau}}$ Lifetime

PRL 59 2519

Measurement of the ${{\mathit \tau}}$ Lepton Lifetime

PL B199 580

A Measurement of the ${{\mathit \tau}}$ Lifetime

PRL 59 415

Precise Measurement of the Lifetime of the ${{\mathit \tau}}$ Lepton

PR D36 690

Measurement of the ${{\mathit \tau}}$ Lifetime

PRL 48 66

Measurement of the ${{\mathit \tau}}$ Lifetime

Except where otherwise noted, content of the 2022 Review of Particle Physics is licensed under a Creative Commons Attribution-NonCommercial 4.0 International (CC BY-NC 4.0) license. The publication of the Review of Particle Physics is supported by US DOE, MEXT (Japan), INFN (Italy), JPS and CERN. Individual collaborators receive support for their PDG activities from their respective institutes or funding agencies. © 2022. See LBNL disclaimers.