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

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

# NEUTRAL ONLY, PHOTOPRODUCED INSPIRE search

VALUE (MeV) EVTS DOCUMENT ID TECN  COMMENT
$\bf{ 151.7 \pm2.6}$ OUR AVERAGE
$155$ $\pm5$ $\pm2$ 63.5k 1
 2012
ZEUS ${{\mathit e}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit e}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit p}}$
$146$ $\pm3$ $\pm13$ 79k 2
 1998 B
ZEUS $50 - 100$ ${{\mathit \gamma}}{{\mathit p}}$
$150.9$ $\pm3.0$
 1978
CNTR ${{\mathit \gamma}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit e}^{+}}{{\mathit e}^{-}}{{\mathit p}}$
• • • We do not use the following data for averages, fits, limits, etc. • • •
$138$ $\pm3$ 79k 3
 1998 B
ZEUS $50 - 100$ ${{\mathit \gamma}}{{\mathit p}}$
$147$ $\pm11$
 1973
CNTR 2.9$-$4.7 ${{\mathit \gamma}}{{\mathit p}}$
$155$ $\pm12$ 2430
 1972
HBC 4.7 ${{\mathit \gamma}}{{\mathit p}}$
$145$ $\pm13$ 1930
 1972
HBC 2.8 ${{\mathit \gamma}}{{\mathit p}}$
$140$ $\pm5$
 1970
CNTR ${{\mathit \gamma}}{}^{}\mathrm {A}$, $\mathit t$ $<$0.01
$146.1$ $\pm2.9$ 140k
 1970
CNTR $<$4.1 ${{\mathit \gamma}}$ ${}^{}\mathrm {C}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{}^{}\mathrm {C}$
$160$ $\pm10$
 1968
CNTR ${{\mathit \gamma}}{{\mathit p}}$
$130$ $\pm5$ 4000
 1967 B
CNTR ${{\mathit \gamma}}{+}$ ${}^{}\mathrm {Pb}$
1  Using the KUHN 1990 parametrization of the pion form factor, neglecting ${{\mathit \rho}}−{{\mathit \omega}}$ interference.
2  From the parametrization according to SOEDING 1966 .
3  From the parametrization according to ROSS 1966 .
References:
 ABRAMOWICZ 2012
EPJ C72 1869 Exclusive Electroproduction of Two Pions at HERA
 BREITWEG 1998B
EPJ C2 247 Measurement of Elastic ${{\mathit \rho}^{0}}$ Photoproduction at HERA
 BARTALUCCI 1978
NC 44A 587 Measurement of the Photoproduction Phases of the ${{\mathit \rho}}$, ${{\mathit \omega}}$, and ${{\mathit \phi}}$ Mesons
PR D8 3721 Measurement of Photoproduction of ${{\mathit \omega}}$ and ${{\mathit \rho}{(770)}^{0}}$ Mesons in Hydrogen
PR D5 545 Bubble Chamber Study of Photoproduction by 2.8 and 4.7 GeV Polarized Photons. I. Cross Section Determinations and Production of ${{\mathit \rho}{(770)}^{0}}$ and ${{\mathit \Delta}{(1232)}}$ in the Reaction of ${{\mathit \gamma}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit p}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$
PRL 24 786 Photoproduction of Neutral ${{\mathit \rho}}$ Mesons from Complex Nuclei
PRL 24 1197 Observation of ${{\mathit \rho}}{{\mathit \omega}}$ Interference in the Photoproduction of Electron Positron Pairs from Carbon and a Measurement of the ${{\mathit \rho}}$ $−$ ${{\mathit \omega}}$ Phase
PR 166 1365 Photoproduction of Neutral ${{\mathit \rho}}$ Mesons
PRL 19 865 High Energy Photoproduction of Neutral ${{\mathit \rho}{(770)}^{0}}$ Mesons on Complex Nuclei