${{\mathit \rho}{(770)}}$ MASS

We no longer list ${\mathit S}{\mathrm -wave}$ Breit-Wigner fits, or data with high combinatorial background.

CHARGED ONLY, ${{\mathit \tau}}$ DECAYS and ${{\mathit e}^{+}}{{\mathit e}^{-}}$ INSPIRE search

M009M5
VALUE (MeV) EVTS DOCUMENT ID TECN CHG  COMMENT
$\bf{ 775.11 \pm0.34}$ OUR AVERAGE
$774.6$ $\pm0.2$ $\pm0.5$ 5.4M 1, 2
FUJIKAWA
2008
BELL $\pm{}$ ${{\mathit \tau}^{-}}$ $\rightarrow$ ${{\mathit \pi}^{-}}{{\mathit \pi}^{0}}{{\mathit \nu}_{{{\tau}}}}$
$775.5$ $\pm0.7$ 2, 3
SCHAEL
2005C
 ALEP ${{\mathit \tau}^{-}}$ $\rightarrow$ ${{\mathit \pi}^{-}}{{\mathit \pi}^{0}}{{\mathit \nu}_{{{\tau}}}}$
$775.5$ $\pm0.5$ $\pm0.4$ 1.98M 4
ALOISIO
2003
KLOE 1.02 ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \pi}^{0}}$
$775.1$ $\pm1.1$ $\pm0.5$ 87k 5, 6
ANDERSON
2000A
 CLE2 ${{\mathit \tau}^{-}}$ $\rightarrow$ ${{\mathit \pi}^{-}}{{\mathit \pi}^{0}}{{\mathit \nu}_{{{\tau}}}}$
• • • We do not use the following data for averages, fits, limits, etc. • • •
$761.60$ $\pm0.95$ 7
BARTOS
2017A
 RVUE ${{\mathit \tau}^{-}}$ $\rightarrow$ ${{\mathit \pi}^{-}}{{\mathit \pi}^{0}}{{\mathit \nu}_{{{\tau}}}}$
$774.8$ $\pm0.6$ $\pm0.4$ 1.98M 8
ALOISIO
2003
KLOE - 1.02 ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \pi}^{0}}$
$776.3$ $\pm0.6$ $\pm0.7$ 1.98M 8
ALOISIO
2003
KLOE + 1.02 ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \pi}^{0}}$
$773.9$ $\pm2.0$ ${}^{+0.3}_{-1.0}$ 9
SANZ-CILLERO
2003
RVUE ${{\mathit \tau}^{-}}$ $\rightarrow$ ${{\mathit \pi}^{-}}{{\mathit \pi}^{0}}{{\mathit \nu}_{{{\tau}}}}$
$774.5$ $\pm0.7$ $\pm1.5$ 500k 4
ACHASOV
2002
SND $\pm{}$ 1.02 ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \pi}^{0}}$
$775.1$ $\pm0.5$ 10
PICH
2001
RVUE ${{\mathit \tau}^{-}}$ $\rightarrow$ ${{\mathit \pi}^{-}}{{\mathit \pi}^{0}}{{\mathit \nu}_{{{\tau}}}}$
1  $\vert \mathit F_{{{\mathit \pi}}}(0)\vert ^2$ fixed to 1.
2  From the GOUNARIS 1968 parametrization of the pion form factor.
3  The error combines statistical and systematic uncertainties. Supersedes BARATE 1997M.
4  Assuming ${\mathit m}_{{{\mathit \rho}^{+}}}$ = ${\mathit m}_{{{\mathit \rho}^{-}}}$, $\Gamma _{{{\mathit \rho}^{+}}}$ = $\Gamma _{{{\mathit \rho}^{-}}}$.
5   ${{\mathit \rho}{(1700)}}$ mass and width fixed at 1700 MeV and 235 MeV respectively.
6  From the GOUNARIS 1968 parametrization of the pion form factor. The second error is a model error taking into account different parametrizations of the pion form factor.
7  Applies the Unitary $\&$ Analytic Model of the pion electromagnetic form factor of DUBNICKA 2010 to analyze the data of FUJIKAWA 2008.
8  Without limitations on masses and widths.
9  Using the data of BARATE 1997M and the effective chiral Lagrangian.
10  From a fit of the model-independent parameterization of the pion form factor to the data of BARATE 1997M.
  References:
BARTOS 2017A
IJMP A32 1750154 The Mass and Width Differences of the Neutral and Charged ${{\mathit \rho}{(770)}}$, ${{\mathit \rho}{(1450 )}}$ and ${{\mathit \rho}{(1700)}}$ Mesons from ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$ and ${{\mathit \nu}}{{\mathit \tau}}{{\mathit \pi}^{-}}{{\mathit \pi}^{0}}$ Processes
FUJIKAWA 2008
PR D78 072006 High-Statistics Study of the  Decay
SCHAEL 2005C
PRPL 421 191 Branching Ratios and Spectral Functions of ${{\mathit \tau}}$ Decays: Final ALEPH Measurements and Physics Implications
ALOISIO 2003
PL B561 55 Study of the Decay ${{\mathit \phi}}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \pi}^{0}}$ with the Detector
SANZ-CILLERO 2003
EPJ C27 587 ${{\mathit \rho}}$ Meson Properties in the Chiral Theory Framework
ACHASOV 2002
PR D65 032002 Study of the ${{\mathit \pi}}{{\mathit \pi}}$ Mass Spectra in the Process ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \pi}^{0}}$ at $\sqrt {s }$ = 1020 MeV
PICH 2001
PR D63 093005 The Vector Form-factor of the Pion from Unitarity and Analyticity: a Model Independent Approach
ANDERSON 2000A
PR D61 112002 Hadronic Structure in the Decay ${{\mathit \tau}^{-}}$ $\rightarrow$ ${{\mathit \pi}^{-}}{{\mathit \pi}^{0}}{{\mathit \nu}_{{{\tau}}}}$