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¹	ABLIKIM 2014D fit ${\mathit \sigma (}$ ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit \tau}^{+}}{{\mathit \tau}^{-}}{)}$ at different energies near threshold.

²	AUBERT 2009AK and BELOUS 2007 fit $\tau $ pseudomass spectrum in ${{\mathit \tau}}$ $\rightarrow$ ${{\mathit \pi}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \nu}_{{\tau}}}$ decays. Result assumes ${\mathit m}_{{{\mathit \nu}_{{\tau}}}}$ = 0.

ABBIENDI 2000A fit ${{\mathit \tau}}$ pseudomass spectrum in ${{\mathit \tau}}$ $\rightarrow$ ${{\mathit \pi}^{\pm}}{}\leq{}2{{\mathit \pi}^{0}}{{\mathit \nu}_{{\tau}}}$ and ${{\mathit \tau}}$ $\rightarrow$ ${{\mathit \pi}^{\pm}}$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{}\leq{}1{{\mathit \pi}^{0}}{{\mathit \nu}_{{\tau}}}$ decays. Result assumes ${\mathit m}_{{{\mathit \nu}_{{\tau}}}}$=0.

⁴	BAI 1996 fit $\sigma\mathrm {( {{\mathit e}^{+}} {{\mathit e}^{-}} \rightarrow {{\mathit \tau}^{+}} {{\mathit \tau}^{-}} )}$ at different energies near threshold.

⁵	ALBRECHT 1992M fit ${{\mathit \tau}}$ pseudomass spectrum in ${{\mathit \tau}^{-}}$ $\rightarrow$ 2 ${{\mathit \pi}^{-}}{{\mathit \pi}^{+}}{{\mathit \nu}_{{\tau}}}$ decays. Result assumes ${\mathit m}_{{{\mathit \nu}_{{\tau}}}}$=0.

⁶	BACINO 1978B value comes from ${{\mathit e}^{\pm}}{{\mathit X}^{\mp}}$ threshold. Published mass 1782 MeV increased by 1 MeV using the high precision ${{\mathit \psi}{(2S)}}$ mass measurement of ZHOLENTZ 1980 to eliminate the absolute SPEAR energy calibration uncertainty.

⁷

BALEST 1993 fit spectra of minimum kinematically allowed ${{\mathit \tau}}$ mass in events of the type ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit \tau}^{+}}{{\mathit \tau}^{-}}$ $\rightarrow$ (${{\mathit \pi}^{+}}{{\mathit n}}{{\mathit \pi}^{0}}{{\mathit \nu}_{{\tau}}}$ )(${{\mathit \pi}^{-}}{{\mathit m}}{{\mathit \pi}^{0}}{{\mathit \nu}_{{\tau}}}$ ) $\mathit n{}\leq{}$2, $\mathit m{}\leq{}$2, 1${}\leq{}\mathit n+\mathit m{}\leq{}$3. If ${\mathit m}_{{{\mathit \nu}_{{\tau}}}}{}\not=$0, result increases by (${{\mathit m}^{2}}_{{{\mathit \nu}_{{\tau}}}}$/1100 MeV).

⁸	BAI 1992 fit $\sigma\mathrm {( {{\mathit e}^{+}} {{\mathit e}^{-}} \rightarrow {{\mathit \tau}^{+}} {{\mathit \tau}^{-}} )}$ near threshold using ${{\mathit e}}{{\mathit \mu}}$ events.

References:

ABLIKIM

2014D

PR D90 012001

Precision Measurement of the Mass of the ${{\mathit \tau}}$ Lepton

AUBERT

2009AK

PR D80 092005

Measurements of the ${{\mathit \tau}}$ Mass and the Mass Difference of the ${{\mathit \tau}^{+}}$ and ${{\mathit \tau}^{-}}$ at BABAR

ANASHIN

2007

JETPL 85 347

New Precise Determination of the ${{\mathit \tau}}$ Lepton Mass at KEDR Detector

BELOUS

2007

PRL 99 011801

Measurement of the ${{\mathit \tau}}$ Lepton Mass and an Upper Limit on the Mass Difference between ${{\mathit \tau}^{+}}$ and ${{\mathit \tau}^{-}}$

ABBIENDI

2000A

PL B492 23

A Measurement of the ${{\mathit \tau}}$ Mass and First $\mathit CPT$ Test with ${{\mathit \tau}}$ Leptons

ANASTASSOV

1997

PR D55 2559

Experimental Test of Lepton Universality in ${{\mathit \tau}}$ Decay

Also

PR D58 119903 (erratum)

Erratum: ANASTASSOV 1997 Experimental Test of Lepton Universality in ${{\mathit \tau}}$ Decay

BAI

1996

PR D53 20

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

BALEST

1993

PR D47 3671

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

ALBRECHT

1992M

PL B292 221

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

BAI

1992

PRL 69 3021

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

BACINO

1978B

PRL 41 13

Measurement of the Threshold Behaviour of ${{\mathit \tau}^{+}}{{\mathit \tau}^{-}}$ Production in ${{\mathit e}^{+}}{{\mathit e}^{-}}$ Annihilation

Also

Tokyo Conf. 249

Measurement of the Threshold Behaviour of ${{\mathit \tau}^{+}}{{\mathit \tau}^{-}}$ Production in ${{\mathit e}^{+}}{{\mathit e}^{-}}$ Annihilation

Also

PL 96B 214

High Precision Measurement of the ${{\mathit \psi}}$ and ${{\mathit \psi}^{\,'}}$ Meson Masses

Except where otherwise noted, content of the 2023 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. © 2023. See LBNL disclaimers.

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