Send Feedback
Home
pdgLive
Summary Tables
Reviews, Tables, Plots
Particle Listings
pdgLive Home
>
${{\mathit \tau}}$
>
(${\mathit m}_{{{\mathit \tau}^{+}}}{\mathit m}_{{{\mathit \tau}^{-}}})/\mathit m_{{\mathrm {average}}}$
(${\boldsymbol m}_{{{\boldsymbol \tau}^{+}}}{\boldsymbol m}_{{{\boldsymbol \tau}^{-}}})/\boldsymbol m_{{\mathrm {average}}}$
INSPIRE search
A test of $\mathit CPT$ invariance.
VALUE
CL%
DOCUMENT ID
TECN
COMMENT
$\bf{<2.8 \times 10^{-4}}$
90
BELOUS
2007
BELL
414 fb${}^{-1}$, ${\it{}E}^{\it{}ee}_{\rm{}cm}$=10.6 GeV
• • • We do not use the following data for averages, fits, limits, etc. • • •
$<5.5 \times 10^{-4}$
90
1
AUBERT
2009
AK
BABR
423 fb${}^{-1}$, ${\it{}E}^{\it{}ee}_{\rm{}cm}$=10.6 GeV
$<3.0 \times 10^{-3}$
90
ABBIENDI
2000
A
OPAL
$1990 - 1995$ LEP runs
1
AUBERT 2009AK
quote both the listed upper limit and (${\mathit m}_{{{\mathit \tau}^{+}}}{\mathit m}_{{{\mathit \tau}^{-}}})/\mathit m_{{\mathrm {average}}}$ = ($-3.4$ $\pm1.3$ $\pm0.3$) $ \times 10^{-4}$.
Conservation Laws:
$\mathit CPT$ INVARIANCE
References:
AUBERT
2009AK
PR D80 092005
Measurements of the ${{\mathit \tau}}$ Mass and the Mass Difference of the ${{\mathit \tau}^{+}}$ and ${{\mathit \tau}^{-}}$ at BABAR
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