# ${{\boldsymbol \eta}}{{\boldsymbol \eta}}$ MODE INSPIRE search

VALUE (MeV) DOCUMENT ID TECN  COMMENT
$\bf{ 2157 \pm12}$ OUR AVERAGE
$2151$ $\pm16$
 2000 E
450 ${{\mathit p}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit p}_{{f}}}{{\mathit \eta}}{{\mathit \eta}}{{\mathit p}_{{s}}}$
$2175$ $\pm20$
 1995 D
GAM4 300 ${{\mathit \pi}^{-}}$ ${{\mathit N}}$ $\rightarrow$ ${{\mathit \pi}^{-}}{{\mathit N}}$2 ${{\mathit \eta}}$ , 450 ${{\mathit p}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit p}}{{\mathit p}}$2 ${{\mathit \eta}}$
$2130$ $\pm35$
 1994
GAM4 450 ${{\mathit p}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit p}}{{\mathit p}}$2 ${{\mathit \eta}}$
• • • We do not use the following data for averages, fits, limits, etc. • • •
$2140$ $\pm30$ 1
 1999 B
CBAR $1.94$ ${{\overline{\mathit p}}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \pi}^{0}}{{\mathit \eta}}{{\mathit \eta}}$
$2104$ $\pm20$ 2
 1993 C
E760 ${{\overline{\mathit p}}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \pi}^{0}}{{\mathit \eta}}{{\mathit \eta}}$ $\rightarrow$ 6 ${{\mathit \gamma}}$
1  Spin not determined.
2  No $\mathit J{}^{PC}$ determination.
References:
 BARBERIS 2000E
PL B479 59 A Study of the ${{\mathit \eta}}{{\mathit \eta}}$ Channel Produced in Central ${{\mathit p}}{{\mathit p}}$ Interactions at 450 ${\mathrm {GeV/}}\mathit c$
 ABELE 1999B
EPJ C8 67 Observation of Resonances in the Reaction ${{\overline{\mathit p}}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \pi}^{0}}{{\mathit \eta}}{{\mathit \eta}}$ at 1.94 ${\mathrm {GeV/}}\mathit c{}^{2}$
 PROKOSHKIN 1995D
PD 40 495 Observation of ${{\mathit f}_{{2}}{(2175)}}$ Meson as a Possible Tensor Glueball
 SINGOVSKI 1994
NC A107 1911 The ${{\mathit \eta}}{{\mathit \eta}}$ Systems Produced in 450 ${\mathrm {GeV/}}\mathit c$ Central ${{\mathit p}}{{\mathit p}}$ Collisions
 ARMSTRONG 1993C
PL B307 394 Evidence for ${{\mathit \eta}}{{\mathit \eta}}$ Resonances in Antiproton Proton Annihilations at 2950 $<$ $\sqrt {s }$ $<$ 3620 MeV