pdgLive

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

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

NEUTRAL ONLY, PHOTOPRODUCED

VALUE (MeV)

EVTS

DOCUMENT ID

TECN

COMMENT

$\bf{ 769.2 \pm0.9}$

OUR AVERAGE

$770.8$ $\pm1.3$ ${}^{+2.3}_{-2.4}$

900k

H1

${{\mathit e}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit e}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit p}}$

$771$ $\pm2$ ${}^{+2}_{-1}$

63.5k

ZEUS

${{\mathit e}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit e}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit p}}$

$770$ $\pm2$ $\pm1$

79k

ZEUS

$50 - 100$ ${{\mathit \gamma}}{{\mathit p}}$

$767.6$ $\pm2.7$

CNTR

${{\mathit \gamma}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit e}^{+}}{{\mathit e}^{-}}{{\mathit p}}$

$775$ $\pm5$

CNTR

2.9$-$4.7 ${{\mathit \gamma}}{{\mathit p}}$

$767$ $\pm4$

1930

HBC

2.8 ${{\mathit \gamma}}{{\mathit p}}$

$770$ $\pm4$

2430

HBC

4.7 ${{\mathit \gamma}}{{\mathit p}}$

$765$ $\pm10$

CNTR

${{\mathit \gamma}}{}^{}\mathrm {A}$, $\mathit t$ $<$0.01

$767.7$ $\pm1.9$

140k

CNTR

$<$4.1 ${{\mathit \gamma}}$ ${}^{}\mathrm {C}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{}^{}\mathrm {C}$

$765$ $\pm5$

4000

CNTR

${{\mathit \gamma}}{+}$ ${}^{}\mathrm {Pb}$

• • We do not use the following data for averages, fits, limits, etc. • •

$771$ $\pm2$

79k

ZEUS

$50 - 100$ ${{\mathit \gamma}}{{\mathit p}}$

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:

EPJ C80 1189

Measurement of exclusive $\pi^+ \pi ^-$ and $\rho^0$ meson photoproduction at HERA

EPJ C72 1869

Exclusive Electroproduction of Two Pions at HERA

EPJ C2 247

Measurement of Elastic ${{\mathit \rho}^{0}}$ Photoproduction at HERA

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

PRL 19 865

High Energy Photoproduction of Neutral ${{\mathit \rho}{(770)}^{0}}$ Mesons on Complex Nuclei

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