${{\mathit \eta}{(2225)}}$ MASS

INSPIRE   PDGID:
M115M
VALUE (MeV) EVTS DOCUMENT ID TECN  COMMENT
$\bf{ 2221 {}^{+13}_{-10}}$ OUR AVERAGE
$2216$ ${}^{+4}_{-5}$ ${}^{+21}_{-11}$ 1
ABLIKIM
2016N
 BES3 ${{\mathit J / \psi}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit K}^{+}}{{\mathit K}^{-}}{{\mathit K}^{+}}{{\mathit K}^{-}}$
$2240$ ${}^{+30}_{-20}$ ${}^{+30}_{-20}$ $196$ $\pm19$
ABLIKIM
2008I
 BES ${{\mathit J / \psi}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit K}^{+}}{{\mathit K}^{-}}{{\mathit K}_S^0}$ ${{\mathit K}_L^0}$
$2230$ $\pm25$ $\pm15$
BAI
1990B
 MRK3 ${{\mathit J / \psi}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit K}^{+}}{{\mathit K}^{-}}{{\mathit K}^{+}}{{\mathit K}^{-}}$
$2214$ $\pm20$ $\pm13$
BAI
1990B
 MRK3 ${{\mathit J / \psi}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit K}^{+}}{{\mathit K}^{-}}{{\mathit K}_S^0}$ ${{\mathit K}_L^0}$
• • We do not use the following data for averages, fits, limits, etc. • •
$\sim{}\text{ 2220}$
BISELLO
1986B
 DM2 ${{\mathit J / \psi}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit K}^{+}}{{\mathit K}^{-}}{{\mathit K}^{+}}{{\mathit K}^{-}}$
1  From a partial wave analysis of ${{\mathit J / \psi}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \phi}}{{\mathit \phi}}$ that also finds significant signals for for ${{\mathit \eta}{(2100)}}$, ${}^{}0{}^{-+}$ phase space, ${{\mathit f}_{{{0}}}{(2100)}}$, ${{\mathit f}_{{{2}}}{(2010)}}$, ${{\mathit f}_{{{2}}}{(2300)}}$, ${{\mathit f}_{{{2}}}{(2340)}}$, and a previously unseen ${}^{}0{}^{-+}$ state ${{\mathit X}{(2500)}}$ (M = $2470$ ${}^{+15}_{-19}{}^{+101}_{-23}$ MeV, $\Gamma $ = $230$ ${}^{+64}_{-35}{}^{+56}_{-33}$ MeV).
References