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

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

# NEUTRAL ONLY, OTHER REACTIONS INSPIRE search

VALUE (MeV) EVTS DOCUMENT ID TECN  COMMENT
$\bf{ 769.0 \pm0.9}$ OUR AVERAGE  Error includes scale factor of 1.4.
$765$ $\pm6$
 1997 C
OBLX 0.0 ${{\overline{\mathit p}}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \pi}^{0}}$
$773$ $\pm1.6$
 1993
ASTE ${{\overline{\mathit p}}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \omega}}$
$762.6$ $\pm2.6$
 1991
EHS 400 ${{\mathit p}}{{\mathit p}}$
$770$ $\pm2$ 1
 1981
RVUE Pion form factor
$768$ $\pm4$ 2, 3
 1980
RVUE
$769$ $\pm3$ 4
 1978
ASPK 3,4,6 ${{\mathit \pi}^{\pm}}{{\mathit N}}$
$768$ $\pm1$ 76k
 1976
HBC 16 ${{\mathit \pi}^{+}}{{\mathit p}}$
$767$ $\pm4$ 4100
 1974
DBC 6 ${{\mathit \pi}^{+}}$ ${{\mathit n}}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit p}}$
$775$ $\pm4$ 32k 2
 1973
HBC 7.1 ${{\mathit \pi}^{+}}{{\mathit p}}$ , $\mathit t$ $<$0.4
$764$ $\pm3$ 6.8k 5
 1972
ASPK 15 ${{\mathit \pi}^{-}}{{\mathit p}}$ , $\mathit t$ $<$0.3
$774$ $\pm3$ 1.7k
 1969
HBC 2.26 ${{\mathit \pi}^{-}}{{\mathit p}}$
$769.2$ $\pm1.5$ 13.3k 6
 1968
RVUE 1.7$-$3.2 ${{\mathit \pi}^{-}}{{\mathit p}}$ , $\mathit t$ $<$10
• • • We do not use the following data for averages, fits, limits, etc. • • •
$774.34$ $\pm0.18$ $\pm0.35$ 970k 7
 2018 C
BES3 ${{\mathit \eta}^{\,'}{(958)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$
$772.93$ $\pm0.18$ $\pm0.34$ 970k 8
 2018 C
BES3 ${{\mathit \eta}^{\,'}{(958)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$
$773.5$ $\pm2.5$ 9
 2001
RVUE ${{\mathit \pi}}$ ${{\mathit \pi}}$ $\rightarrow$ ${{\mathit \pi}}{{\mathit \pi}}$
$762.3$ $\pm0.5$ $\pm1.2$ 600k 10
 1999 E
CBAR 0.0 ${{\overline{\mathit p}}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \pi}^{0}}$
$777$ $\pm2$ 4.9k 11
 1997
E665 470 ${{\mathit \mu}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \mu}}$
$770$ $\pm2$ 12
 1997
MIRA 32 ${{\overline{\mathit p}}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$ X
$768$ $\pm8$ 12
 1997
MIRA 32 ${{\mathit p}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$ X
$761.1$ $\pm2.9$
 1989
RVUE ${{\mathit \pi}}$ form factor
$777.4$ $\pm2.0$ 13
 1983
ASPK 17 ${{\mathit \pi}^{-}}{{\mathit p}}$ polarized
$769.5$ $\pm0.7$ 2, 3
 1979
RVUE
$770$ $\pm9$ 3
 1974
RVUE 17 ${{\mathit \pi}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit n}}$
$773.5$ $\pm1.7$ 11.2k 14
 1972
HBC 2.8 ${{\mathit \pi}^{-}}{{\mathit p}}$
$775$ $\pm3$ 2.2k 15
 1968
OSPK 11.2 ${{\mathit \pi}^{-}}{{\mathit p}}$
1  HEYN 1981 includes all spacelike and timelike $\mathit F_{{{\mathit \pi}}}$ values until 1978.
2  From pole extrapolation.
3  From phase shift analysis of GRAYER 1974 data.
4  Phase shift analysis. Systematic errors added corresponding to spread of different fits.
5  Published values contain misprints. Corrected by private communication RATCLIFF 1974 .
6  Includes MALAMUD 1969 , ARMENISE 1968 , BACON 1967 , HUWE 1967 , MILLER 1967B, ALFF-STEINBERGER 1966 , HAGOPIAN 1966 , HAGOPIAN 1966B, JACOBS 1966B, JAMES 1966 , WEST 1966 , GOLDHABER 1964 , ABOLINS 1963 .
7  From a fit to ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$ mass using ${{\mathit \rho}{(770)}}$ (parametrized with the Gounaris-Sakurai approach), ${{\mathit \omega}{(782)}}$, and box anomaly components.
8  From a fit to ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$ mass using ${{\mathit \rho}{(770)}}$ (parametrized with the Gounaris-Sakurai approach), ${{\mathit \omega}{(782)}}$, and ${{\mathit \rho}{(1450)}}$ components.
9  Breit-Wigner mass from a phase-shift analysis of HYAMS 1973 and PROTOPOPESCU 1973 data.
10  Using relativistic Breit-Wigner and taking into account ${{\mathit \rho}}-{{\mathit \omega}}$ interference.
11  Systematic errors not evaluated.
12  Systematic effects not studied.
13  From fit of 3-parameter relativistic Breit-Wigner to helicity-zero part of P-wave intensity. CHABAUD 1983 includes data of GRAYER 1974 .
14  Mass errors enlarged by us to $\Gamma /\sqrt {\mathit N }$; see the note with the ${{\mathit K}^{*}{(892)}}$ mass.
15  Of HYAMS 1968 six parametrizations, this is theoretically soundest. MR

${{\mathit \rho}{(770)}^{0}}$ mass (MeV)
References:
 ABLIKIM 2018C
PRL 120 242003 Precision Study of $\eta^\prime\rightarrow\gamma\pi^+\pi^-$ Decay Dynamics
 COLANGELO 2001
NP B603 125 ${{\mathit \pi}}{{\mathit \pi}}$ Scattering
 ABELE 1999E
PL B469 270 The ${{\mathit \rho}}$ Mass, Width and Line Shape in ${{\overline{\mathit p}}}{{\mathit p}}$ Annihilation into ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \pi}^{0}}$
ZPHY C74 237 Diffractive Production of ${{\mathit \rho}{(770)}^{0}}$ Mesons in Muon Proton Interactions at 470 GeV
 BERTIN 1997C
PL B408 476 Spin Parity Analysis of the Final State ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \pi}^{0}}$ from ${{\overline{\mathit p}}}{{\mathit p}}$ Annihilation at Rest in Hydrogen Targets at Three Densities
 BOGOLYUBSKY 1997
PAN 60 46 Inclusive Production of the ${{\mathit \rho}{(770)}^{0}}$ and ${{\mathit f}_{{2}}{(1270)}}$ Resonances in ${{\mathit p}}{{\mathit p}}$ and ${{\overline{\mathit p}}}{{\mathit p}}$ Interactions at 32 ${\mathrm {GeV/}}\mathit c$
 WEIDENAUER 1993
ZPHY C59 387 ${{\mathit N}}{{\overline{\mathit N}}}$ Annihilation at Rest into Five Pions
 AGUILAR-BENITEZ 1991
ZPHY C50 405 Inclusive Particle Production in 400 ${\mathrm {GeV/}}\mathit c$ ${{\mathit p}}{{\mathit p}}$ Interactions
 DUBNICKA 1989
JP G15 1349 There is no Discrepancy between Different Pion Formfactor Data Sets
 CHABAUD 1983
NP B223 1 Experimental Indications for a $2+{}^{+}{}^{}$ non (${\mathit {\mathit q}}{\mathit {\overline{\mathit q}}}$) Object
 HEYN 1981
ZPHY C7 169 Analysis of the Pion Formfactor in the Spacelike and Timelike Region
 BOHACIK 1980
PR D21 1342 Parameters of the Dominant Pion Pion Resonances
 LANG 1979
PR D19 956 Determination of Resonance Parameters
 WICKLUND 1978
PR D17 1197 Comparative Study of ${{\mathit \rho}^{0}}$, ${{\mathit \omega}}$, ${{\mathit K}^{*}{(890)}^{0}}$ and ${{\overline{\mathit K}}^{*}{(890)}^{0}}$ Production by Charge Exchange Reactions
 DEUTSCHMANN 1976
NP B103 426 ${{\mathit \rho}^{0}}$ and ${{\mathit f}}$ Production in ${{\mathit \pi}^{+}}{{\mathit p}}$ Interactions
 ENGLER 1974
PR D10 2070 ${{\mathit \pi}}{{\mathit \pi}}$ Scattering in the Energy Region 0.6 to 1.42 GeV
 ESTABROOKS 1974
NP B79 301 ${{\mathit \pi}}{{\mathit \pi}}$ Phase Shift Analysis below the ${{\mathit K}}{{\overline{\mathit K}}}$ Threshold
 PROTOPOPESCU 1973
PR D7 1279 ${{\mathit \pi}}{{\mathit \pi}}$ Partial Wave Analysis from Reactions ${{\mathit \pi}^{+}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \Delta}^{++}}$ and ${{\mathit \pi}^{+}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit K}^{+}}{{\mathit K}^{-}}{{\mathit \Delta}^{++}}$ at 7.1 ${\mathrm {GeV/}}\mathit c$
 JACOBS 1972
PR D6 1291 Parametrization of the Nonevasive Exchange Processes and Background Contributions in the Reaction ${{\mathit \pi}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit n}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$ at 2.77 ${\mathrm {GeV/}}\mathit c$
 RATCLIFF 1972
PL 38B 345 Measurements of ${{\mathit \rho}}{{\mathit \omega}}$ Interference in the Reaction ${{\mathit \pi}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit n}}$ at 15 ${\mathrm {GeV/}}\mathit c$
 REYNOLDS 1969
PR 184 1424 Single Pion Production in ${{\mathit \pi}^{-}}{{\mathit p}}$ Interactions at 2.26 ${\mathrm {GeV/}}\mathit c$
 HYAMS 1968
NP B7 1 The Reaction ${{\mathit \pi}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \rho}^{0}}{{\mathit n}}$ and ${{\mathit K}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\overline{\mathit K}}^{*}{(890)}^{0}}{{\mathit n}}$ at 11.2 ${\mathrm {GeV/}}\mathit c$
 PISUT 1968
NP B6 325 ${{\mathit \rho}}$ Meson Shape