${{\boldsymbol \Xi}{(2120)}}$ MASS INSPIRE search

VALUE (MeV) EVTS DOCUMENT ID TECN  COMMENT
$\bf{ \approx2120}$ OUR ESTIMATE
$2137$ $\pm4$ 18 1
CHLIAPNIKOV
1979
HBC ${{\mathit K}^{+}}{{\mathit p}}$ 32 ${\mathrm {GeV/}}\mathit c$
$2123$ $\pm7$ 2
GAY
1976C
HBC ${{\mathit K}^{-}}{{\mathit p}}$ 4.2 ${\mathrm {GeV/}}\mathit c$
1  CHLIAPNIKOV 1979 does not uniquely identify the ${{\mathit K}^{+}}$ in the ( ${{\overline{\mathit \Lambda}}}{{\mathit K}^{+}}$) X final state. It also reports bumps with fewer events at 2240, 2540, and 2830 MeV.
2  GAY 1976C sees a 4-standard deviation signal. However, HEMINGWAY 1977 , with more events from the same experiment points out that the signal is greatly reduced if a cut is made on the 4-momentum $\mathit u$. This suggests an anomalous production mechanism if the ${{\mathit \Xi}{(2120)}}$ is real.
  References:
CHLIAPNIKOV 1979
NP B158 253 A Study of ${{\overline{\mathit \Lambda}}}{{\mathit \pi}^{+}}$, ${{\overline{\mathit \Lambda}}}{{\mathit K}^{+}}$ and ${{\overline{\mathit \Lambda}}}{{\mathit p}}$ Production in 32 ${\mathrm {GeV/}}\mathit c$ ${{\mathit K}^{+}}{{\mathit p}}$ Interactions
GAY 1976C
PL 62B 477 Production and Decay of ${{\mathit \Xi}^{*}{(1820)}}$ in ${{\mathit K}^{-}}{{\mathit p}}$ Reactions at 4.2 ${\mathrm {GeV/}}\mathit c$