# ${{\boldsymbol X}{(4055)}^{\pm}}$ WIDTH INSPIRE search

VALUE (MeV) DOCUMENT ID TECN  COMMENT
$45$ $\pm11$ $\pm6$ 1
 2015 A
BELL 10.58 ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \psi}{(2S)}}$
• • • We do not use the following data for averages, fits, limits, etc. • • •
$31.9$ $\pm14.8$ 2
 2018 K
BES3 ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit \pi}^{0}}{{\mathit \pi}^{0}}{{\mathit \psi}{(2S)}}$
$26.1$ $\pm5.3$ 3
 2017 V
BES3 ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \psi}{(2S)}}$
1  Statistical significance of 3.5 ${{\mathit \sigma}}$.
2  Statistical error only, with significance of 5.9 $\sigma$ (from a fit with a 19$\%$ CL). Identified as the same structure observed in ABLIKIM 2017V in ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \psi}{(2S)}}$ decays.
3  Statistical error only, with significance of 9.2 $\sigma$. From an unbinned maximum likelihood fit of the ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \psi}{(2S)}}$ Dalitz plot from data collected at $\sqrt {s }$ = 4.416 GeV for a $\mathit J{}^{C} = 1{}^{+}$ state. The fit does not match the detailed structure of the data, having a C.L. of only 8$\%$.
References:
 ABLIKIM 2018K
PR D97 052001 Measurement of $e^{+}e^{-} \to \pi^{0}\pi^{0}\psi(3686)$ at $\sqrt{s}$ from 4.009 to 4.600 GeV and observation of a neutral charmoniumlike structure
 ABLIKIM 2017V
PR D96 032004 Measurement of ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \psi}{(3686)}}$ from 4.008 to 4.600 GeV and Observation of a Charged Structure in the ${{\mathit \pi}^{\pm}}{{\mathit \psi}{(3686)}}$ Mass Spectrum
 WANG 2015A
PR D91 112007 Measurement of ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \psi}{(2S)}}$ via Initial State Radiation at Belle