#### $\mathbf {{{\mathit Z}_{{cs}}{(4000)}^{+}} }$ $\mathit I(\mathit J{}^{P}) = 1/2(1{}^{+})$

MASS ${\mathrm {(MeV)}}$ WIDTH ${\mathrm {(MeV)}}$ DOCUMENT ID TECN  COMMENT
$4003 \pm6 {}^{+4}_{-14}$ $\text{131}$ 1, 2
 2021 E
LHCB ${{\mathit B}^{+}}$ $\rightarrow$ ${{\mathit J / \psi}}{{\mathit \phi}}{{\mathit K}^{+}}$
$3982.5 {}^{+1.8}_{-2.6} \pm2.1$ $12.8 {}^{+5.3}_{-4.4}$ 2, 3
 2021 G
BES3 ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit K}^{+}}$( ${{\mathit D}_{{s}}^{-}}{{\mathit D}^{*0}}{+}$ ${{\mathit D}_{{s}}^{*-}}{{\mathit D}^{0}}$)
 1 From an amplitude analysis of the decay ${{\mathit B}^{+}}$ $\rightarrow$ ${{\mathit J / \psi}}{{\mathit \phi}}{{\mathit K}^{+}}$ with a significance of 15 $\sigma$.
 2 Properties incompatible with a ${{\mathit q}}{{\overline{\mathit q}}}$ structure (exotic state). See the review on "Heavy Non-${{\mathit q}}{{\overline{\mathit q}}}$ Mesons."
 3 Pole mass, width for a mass-,width-dependent Breit-Wigner fit to the mass, width spectrum recoiling against ${{\mathit K}^{+}}$ at center of mass energies between 4.628 and 4.698 GeV, with a significance of 5.3 $\sigma$.
References:
 AAIJ 2021E
PRL 127 082001 Observation of New Resonances Decaying to $J/\psi K^+$+ and $J/\psi \phi$
 ABLIKIM 2021G
PRL 126 102001 Observation of a Near-Threshold Structure in the $K^+$ Recoil-Mass Spectra in $e^+e^- \rightarrow K^+(D_s^-D^{*0}+D_s^{*-}D^0$)