${{\mathit \eta}{(2370)}}$ MASS INSPIRE search

M247M
VALUE (MeV) EVTS DOCUMENT ID TECN  COMMENT
$\bf{ 2377 \pm9}$ OUR AVERAGE
$2395$ $\pm11$ ${}^{+26}_{-94}$ 1
ABLIKIM
2024
BES3 ${{\mathit J / \psi}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit K}_S^0}$ ${{\mathit K}_S^0}$ ${{\mathit \eta}^{\,'}}$
$2376.3$ $\pm8.7$ ${}^{+3.2}_{-4.3}$ 565
ABLIKIM
2011C
 BES3 ${{\mathit J / \psi}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \eta}^{\,'}}$
• • • We do not use the following data for averages, fits, limits, etc. • • •
$2341.6$ $\pm6.5$ $\pm5.7$ 2
ABLIKIM
2020Q
 BES3 ${{\mathit J / \psi}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit K}}{{\overline{\mathit K}}}{{\mathit \eta}^{\,'}}$
1  Decaying to ${{\mathit f}_{{{0}}}{(980)}}{{\mathit \eta}^{\,'}}$, fitted together with ${{\mathit X}{(1835)}}$, a 600 MeV broad structure around 2.8 GeV, and the tail of the ${{\mathit \eta}_{{{c}}}{(1S)}}$. Supersedes ABLIKIM 2020Q.
2  The state observed by ABLIKIM 2011C at 2120 MeV is not observed with 90$\%$ CL upper limit of $1.49 \times 10^{-5}$ for ${{\mathit J / \psi}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit X}{(2120)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit K}^{+}}{{\mathit K}^{-}}{{\mathit \eta}^{\,'}}$ and $6.38 \times 10^{-6}$ for ${{\mathit K}_S^0}$ ${{\mathit K}_S^0}$ ${{\mathit \eta}^{\,'}}$.
  References:
ABLIKIM 2024
PRL 132 181901 Determination of Spin-Parity of the $X(2370)$ in $J/\psi\rightarrow\gamma K^{0}_{S}K^{0}_{S}\eta^{\prime}$
ABLIKIM 2020Q
EPJ C80 746 Observation of $X(2370)$ and search for X(2120) in $J/\psi \rightarrow \gamma K{\bar{K}} \eta '$
ABLIKIM 2011C
PRL 106 072002 Confirmation of the ${{\mathit X}{(1835)}}$ and Observation of the Resonances ${{\mathit X}{(2120)}}$ and ${{\mathit X}{(2370)}}$ in ${{\mathit J / \psi}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \eta}^{\,'}}$