INSPIRE   JSON PDGID:
M213

${{\mathit T}_{{{c {{\overline{\mathit c}}}}}}{(4020)}}$

$I^G(J^{PC})$ = $1^+(?^{? -})$ 

was ${{\mathit X}{(4020)}}$
Properties incompatible with a ${{\mathit q}}{{\overline{\mathit q}}}$ structure (exotic state). See the review on non-${{\mathit q}}{{\overline{\mathit q}}}$ states. Charged ${{\mathit T}_{{{c {{\overline{\mathit c}}}}}}{(4020)}}$ seen by ABLIKIM 2013X from ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit h}_{{{c}}}{(1P)}}$ at c.m. energy from 3.90 to 4.42 GeV as a peak in the invariant mass distribution of the ${{\mathit \pi}^{\pm}}{{\mathit h}_{{{c}}}{(1P)}}$ system, and by ABLIKIM 2014B from ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ( ${{\mathit D}^{*}}{{\overline{\mathit D}}^{*}}){}^{+-}{{\mathit \pi}^{\mp}}$ events in (${{\mathit D}^{*}}{{\overline{\mathit D}}^{*}}){}^{+-}$ mass. A neutral ${{\mathit T}_{{{c {{\overline{\mathit c}}}}}}{(4020)}}$ seen by ABLIKIM 2014P at three c.m. energies in the same range in ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit \pi}^{0}}{{\mathit \pi}^{0}}{{\mathit h}_{{{c}}}{(1P)}}$ as a peak in the larger of the two masses recoiling against a ${{\mathit \pi}^{0}}$. ABLIKIM 2015AA observes a 5.9 $\sigma $ signal in (${{\mathit D}^{*}}{{\overline{\mathit D}}^{*}}){}^{0}$ in ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ (${{\mathit D}^{*}}{{\overline{\mathit D}}^{*}}){}^{0}{{\mathit \pi}^{0}}$ events using collisions at two c.m. energies. Production rates and mass values support grouping neutral and charged ${{\mathit T}_{{{c {{\overline{\mathit c}}}}}}{(4020)}}$ together as manifestations of a single $\mathit I = $ particle.
${{\mathit T}_{{{c {{\overline{\mathit c}}}}}}{(4020)}}$ MASS   $4024.1 \pm1.9$ MeV 
 
${{\mathit T}_{{{c {{\overline{\mathit c}}}}}}{(4020)}}$ WIDTH   $13 \pm5$ MeV (S = 1.7)
 
$\Gamma_{1}$ ${{\mathit h}_{{{c}}}{(1P)}}{{\mathit \pi}}$   seen 450
 
$\Gamma_{2}$ ${{\mathit D}^{*}}{{\overline{\mathit D}}^{*}}$   seen 85
 
$\Gamma_{3}$ ${{\mathit D}}{{\overline{\mathit D}}^{*}}$ + c.c.   not seen 542
 
$\Gamma_{4}$ ${{\mathit \eta}_{{{c}}}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$   not seen 872
 
$\Gamma_{5}$ ${{\mathit \eta}_{{{c}}}{(1S)}}{{\mathit \rho}{(770)}^{\pm}}$    
 
$\Gamma_{6}$ ${{\mathit J / \psi}{(1S)}}{{\mathit \pi}^{\pm}}$   not seen 811
 
FOOTNOTES