pdgLive

BES

${{\mathit J / \psi}}$ $\rightarrow$ ${{\mathit \gamma}}$( ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$)

$520$ $\pm50$

450 ${{\mathit p}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit p}}{{\mathit p}}$4 ${{\mathit \pi}}$

$485$ $\pm55$

450 ${{\mathit p}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit p}}{{\mathit p}}$4 ${{\mathit \pi}}$

$460$ $\pm40$

1997

OMEG

450 ${{\mathit p}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit p}}{{\mathit p}}$2( ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$)

$390$ $\pm60$

ANTINORI

1995

OMEG

300,450 ${{\mathit p}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit p}}{{\mathit p}}$2( ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$)

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

$441$ ${}^{+27}_{-25}$ ${}^{+28}_{-192}$

UEHARA

2009

BELL

10.6 ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit e}^{+}}{{\mathit e}^{-}}{{\mathit \pi}^{0}}{{\mathit \pi}^{0}}$

$450$ $\pm50$

⁴

BINON

2005

GAMS

33 ${{\mathit \pi}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \eta}}{{\mathit \eta}}{{\mathit n}}$

$297$ $\pm12$ $\pm6$

ABE

2004

BELL

10.6 ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit e}^{+}}{{\mathit e}^{-}}{{\mathit K}^{+}}{{\mathit K}^{-}}$

$495$ $\pm35$

SPEC

$500$ $\pm100$

1999

SPEC

$1.35 - 1.94$ ${{\mathit p}}$ ${{\overline{\mathit p}}}$ $\rightarrow$ ${{\mathit \eta}}{{\mathit \eta}}{{\mathit \pi}^{0}}$

$\sim$$100$

⁵

OAKDEN

1994

RVUE

$0.36 - 1.55$ ${{\overline{\mathit p}}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \pi}}{{\mathit \pi}}$

$250$ $\pm50$

⁶

ASTON

1991

LASS

11 ${{\mathit K}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \Lambda}}{{\mathit K}}{{\overline{\mathit K}}}{{\mathit \pi}}{{\mathit \pi}}$

¹	Decaying into ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$2 ${{\mathit \pi}^{0}}$ .

²	Decaying into 2( ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$ ).

³	Taking into account ${{\mathit f}_{{4}}{(2050)}}$.

⁴	First solution, PWA is ambiguous.

⁵

From solution B of amplitude analysis of data on ${{\overline{\mathit p}}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \pi}}{{\mathit \pi}}$ . See however KLOET 1996 who fit ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$ only and find waves only up to $\mathit J = 3$ to be important but not significantly resonant.

⁶	Cannot determine spin to be 2.

References:

UEHARA

2009

PR D79 052009

High-Statistics Study of Neutral-Pion Pair Production in Two-Photon Collisions

BINON

2005

PAN 68 960

Investigation of the ${{\mathit \eta}}{{\mathit \eta}}$ System in ${{\mathit \pi}^{-}}{{\mathit p}}$ Interactions at a Momentum of 32.5 GeV/$\mathit c$ at the GAMS-4$\pi $ Spectrometer

ABE

2004

EPJ C32 323

Measurement of ${{\mathit K}^{+}}{{\mathit K}^{-}}$ Production in Two Photon Collisions in the Resonant Mass Region

2000J

PL B491 47

I = 0 C = +1 Mesons from 1920 to 2410 MeV

BAI

2000A

PL B472 207

Partial Wave Analysis of ${{\mathit J / \psi}}$ $\rightarrow$ ${{\mathit \gamma}}$( ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$)

2000C

PL B471 440

A Spin Analysis of the 4${{\mathit \pi}}$ Channels Produced in Central ${{\mathit p}}{{\mathit p}}$ Interactions at 450 ${\mathrm {GeV/}}\mathit c$

1999B

PL B449 154

Observation of ${{\mathit f}_{{0}}{(1770)}}$ $\rightarrow$ ${{\mathit \eta}}{{\mathit \eta}}$ in ${{\overline{\mathit p}}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \eta}}{{\mathit \eta}}{{\mathit \pi}^{0}}$ Reactions from 600 to 1200 ${\mathrm {MeV}}/\mathit c$