${{\boldsymbol \rho}{(770)}}$ WIDTH

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

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

VALUE (MeV) EVTS DOCUMENT ID TECN CHG  COMMENT
$\bf{ 149.1 \pm0.8}$ OUR FIT
$\bf{ 149.1 \pm0.8}$ OUR AVERAGE
$148.1$ $\pm0.4$ $\pm1.7$ 5.4M 1, 2
 2008
BELL $\pm{}$ ${{\mathit \tau}^{-}}$ $\rightarrow$ ${{\mathit \pi}^{-}}{{\mathit \pi}^{0}}{{\mathit \nu}_{{\tau}}}$
$149.0$ $\pm1.2$ 2, 3
 2005 C
ALEP ${{\mathit \tau}^{-}}$ $\rightarrow$ ${{\mathit \pi}^{-}}{{\mathit \pi}^{0}}{{\mathit \nu}_{{\tau}}}$
$149.9$ $\pm2.3$ $\pm2.0$ 500k 4
 2002
SND $\pm{}$ 1.02 ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \pi}^{0}}$
$150.4$ $\pm1.4$ $\pm1.4$ 87k 5, 6
 2000 A
CLE2 ${{\mathit \tau}^{-}}$ $\rightarrow$ ${{\mathit \pi}^{-}}{{\mathit \pi}^{0}}{{\mathit \nu}_{{\tau}}}$
• • • We do not use the following data for averages, fits, limits, etc. • • •
$139.90$ $\pm0.46$ 7
 2017 A
RVUE ${{\mathit \tau}^{-}}$ $\rightarrow$ ${{\mathit \pi}^{-}}{{\mathit \pi}^{0}}{{\mathit \nu}_{{\tau}}}$
$143.7$ $\pm1.3$ $\pm1.2$ 1.98M 4
 2003
KLOE $\pm{}$ 1.02 ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \pi}^{0}}$
$142.9$ $\pm1.3$ $\pm1.4$ 1.98M 8
 2003
KLOE - 1.02 ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \pi}^{0}}$
$144.7$ $\pm1.4$ $\pm1.2$ 1.98M 8
 2003
KLOE + 1.02 ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \pi}^{0}}$
$150.2$ $\pm2.0$ ${}^{+0.7}_{-1.6}$ 9
 2003
RVUE ${{\mathit \tau}^{-}}$ $\rightarrow$ ${{\mathit \pi}^{-}}{{\mathit \pi}^{0}}{{\mathit \nu}_{{\tau}}}$
$150.9$ $\pm2.2$ $\pm2.0$ 500k 10
 2002
SND 1.02 ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \pi}^{0}}$
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  Assuming ${\mathit m}_{{{\mathit \rho}^{0}}}$ = ${\mathit m}_{{{\mathit \rho}^{\pm}}}$, $\mathit g_{ {{\mathit \rho}^{0}} {{\mathit \pi}} {{\mathit \pi}} }$ = $\mathit g_{ {{\mathit \rho}^{\pm}} {{\mathit \pi}} {{\mathit \pi}} }$.
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
 ANDERSON 2000A
PR D61 112002 Hadronic Structure in the Decay ${{\mathit \tau}^{-}}$ $\rightarrow$ ${{\mathit \pi}^{-}}{{\mathit \pi}^{0}}{{\mathit \nu}_{{\tau}}}$
see fit info