# 2 ( ${{\boldsymbol \pi}^{+}}{{\boldsymbol \pi}^{-}}$ ) MODE INSPIRE search

VALUE (MeV) EVTS DOCUMENT ID TECN  COMMENT
• • • We do not use the following data for averages, fits, limits, etc. • • •
$1851$ ${}^{+27}_{-24}$
 1997
RVUE ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ 2( ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$ )
$1570$ $\pm20$ 1
 1982
DM1 ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ 2( ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$)
$1520$ $\pm30$ 2
 1981 E
OMEG 20$-$70 ${{\mathit \gamma}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit p}}$4 ${{\mathit \pi}}$
$1654$ $\pm25$ 3
 1981
DBC ${{\mathit \pi}^{+}}$ ${{\mathit d}}$ $\rightarrow$ ${{\mathit p}}{{\mathit p}}$2( ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$)
$1666$ $\pm39$ 1
 1980
FRAG ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ 2( ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$)
$1780$ 34
 1980
SPEC 11 ${{\mathit e}^{-}}$ ${{\mathit p}}$ $\rightarrow$ 2( ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$)
$1500$ 4
 1979 B
SPEC 50 ${{\mathit \gamma}}$ ${}^{}\mathrm {C}$ $\rightarrow$ ${}^{}\mathrm {C}$ 4 ${{\mathit \pi}^{\pm}}$
$1570$ $\pm60$ 65 5
 1975
HBC 7.5 ${{\mathit \gamma}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit p}}$4 ${{\mathit \pi}}$
$1550$ $\pm60$ 2
 1974
OSPK ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ 2( ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$)
$1550$ $\pm50$ 160
 1974
STRC 5.5$-$9 ${{\mathit \gamma}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit p}}$4 ${{\mathit \pi}}$
$1450$ $\pm100$ 340
 1974
STRC 9$-$18 ${{\mathit \gamma}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit p}}$4 ${{\mathit \pi}}$
$1430$ $\pm50$ 400
 1972 B
HBC 9.3 ${{\mathit \gamma}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit p}}$4 ${{\mathit \pi}}$
1  Simple relativistic Breit-Wigner fit with model dependent width.
2  Simple relativistic Breit-Wigner fit with constant width.
3  One peak fit result.
4  Parameters roughly estimated, not from a fit.
5  Skew mass distribution compensated by Ross-Stodolsky factor.
References:
 ACHASOV 1997
PR D55 2663 ${{\mathit \rho}^{\,'}}$'s in Analyzing ${{\mathit e}^{+}}{{\mathit e}^{-}}$ Annihilation, MARK III, LASS and ARGUS Data
 CORDIER 1982
PL 109B 129 A Study of the ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ 2 ${{\mathit \pi}^{+}}$2 ${{\mathit \pi}^{-}}$ Reaction in the 1.4 $−$ 2.18 GeV Energy Range
 ASTON 1981E
NP B189 15 The Reaction ${{\mathit \gamma}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit p}}$2 ${{\mathit \pi}^{+}}$2 ${{\mathit \pi}^{-}}$ for Photon Energies from 25 to 70 GeV
 DIBIANCA 1981
PR D23 595 Resonant Structure in the ${{\mathit \pi}^{+}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \pi}^{-}}$ System between 1.5 and 1.9 GeV
 BACCI 1980
PL 95B 139 Measurement of the ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$ Cross Section in the ${{\mathit \rho}^{\,'}{(1600)}}$ Energy Region
 KILLIAN 1980
PR D21 3005 Observation of Meson Resonances in Electroproduction
 ATIYA 1979B
PRL 43 1691 High Energy Photoproduction of ${{\mathit \rho}^{\,'}{(1600)}}$
 ALEXANDER 1975
PL 57B 487 Measurement of the ${{\mathit \gamma}}−$V Coupling Constants and $\sigma _{T}(V{{\mathit d}}$) from Coherent ${{\mathit \gamma}}{{\mathit d}}$ Interactions at 7.5 GeV
 CONVERSI 1974
PL 52B 493 On the Possible Existence of a Vector Meson ${{\mathit \rho}{(1250)}}$
 SCHACHT 1974
NP B81 205 Resonance Production in the Reaction ${{\mathit \gamma}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit p}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$ in the Energy Range $\mathit E_{{{\mathit \gamma}}}$ = 3.0-18.0 GeV
 BINGHAM 1972B
PL 41B 635 Observation of a Four Pion Vector Meson State of Mass $\simeq{}$ 1.5 GeV Produced by Linearly Polarized 9.3 GeV Photons