${\mathit {\mathit c}}$ ${\mathit {\overline{\mathit c}}}$ MESONS
(including possibly non- ${\mathit {\mathit q}}$ ${\mathit {\overline{\mathit q}}}$ states)
INSPIRE search

${{\boldsymbol \psi}{(4260)}}$

$I^G(J^{PC})$ = $0^-(1^{- -})$ 

also known as ${{\mathit Y}{(4260)}}$; was ${{\mathit X}{(4260)}}$
The state ${{\mathit \psi}{(4260)}}$ received its mass label from a Breit-Wigner (BW) fit to the ${{\mathit J / \psi}}{{\mathit \pi}}{{\mathit \pi}}$ data listed below. The symmetric BW placed the mass unavoidably into the center of the distribution. The most recent measurement in the 4260 MeV mass range in the same channel (ABLIKIM 2017B), however, revealed that the distribution is asymmetric and that the state has a much lower mass consistent with the entry for particle ${{\mathit \psi}{(4230)}}$. Thus, in this edition we merged the measurement of ABLIKIM 2017B with the ${{\mathit \psi}{(4230)}}$ node and labeled the older measurements of this node as not used. For details see the review on "Spectroscopy of mesons containing two heavy quarks."
${{\mathit \psi}{(4260)}}$ MASS
${{\mathit \psi}{(4260)}}$ WIDTH
$\Gamma_{1}$ ${{\mathit e}^{+}}{{\mathit e}^{-}}$  2115
$\Gamma_{2}$ ${{\mathit J / \psi}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$  seen 950
$\Gamma_{3}$ ${{\mathit J / \psi}}{{\mathit f}_{{0}}{(980)}}$ , ${{\mathit f}_{{0}}{(980)}}$ $\rightarrow$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$  seen  
$\Gamma_{4}$ ${{\mathit Z}_{{c}}{(3900)}^{\pm}}{{\mathit \pi}^{\mp}}$ , ${{\mathit Z}_{{c}}^{\pm}}$ $\rightarrow$ ${{\mathit J / \psi}}{{\mathit \pi}^{\pm}}$  seen  
$\Gamma_{5}$ ${{\mathit J / \psi}}{{\mathit \pi}^{0}}{{\mathit \pi}^{0}}$  seen 952
$\Gamma_{6}$ ${{\mathit J / \psi}}{{\mathit K}^{+}}{{\mathit K}^{-}}$  seen 477
$\Gamma_{7}$ ${{\mathit J / \psi}}{{\mathit K}_S^0}$ ${{\mathit K}_S^0}$  not seen 465
$\Gamma_{8}$ ${{\mathit J / \psi}}{{\mathit \eta}}$  not seen 857
$\Gamma_{9}$ ${{\mathit J / \psi}}{{\mathit \pi}^{0}}$  not seen 974
$\Gamma_{10}$ ${{\mathit J / \psi}}{{\mathit \eta}^{\,'}}$  not seen 520
$\Gamma_{11}$ ${{\mathit J / \psi}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \pi}^{0}}$  not seen 912
$\Gamma_{12}$ ${{\mathit J / \psi}}{{\mathit \eta}}{{\mathit \pi}^{0}}$  not seen 780
$\Gamma_{13}$ ${{\mathit J / \psi}}{{\mathit \eta}}{{\mathit \eta}}$  not seen 247
$\Gamma_{14}$ ${{\mathit \psi}{(2S)}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$  not seen 437
$\Gamma_{15}$ ${{\mathit \psi}{(2S)}}{{\mathit \eta}}$  not seen -1
$\Gamma_{16}$ ${{\mathit \chi}_{{c0}}}{{\mathit \omega}}$  not seen 205
$\Gamma_{17}$ ${{\mathit \chi}_{{c1}}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \pi}^{0}}$  not seen 537
$\Gamma_{18}$ ${{\mathit \chi}_{{c2}}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \pi}^{0}}$  not seen 489
$\Gamma_{19}$ ${{\mathit h}_{{c}}{(1P)}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$  not seen 593
$\Gamma_{20}$ ${{\mathit \phi}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$  not seen 1982
$\Gamma_{21}$ ${{\mathit \phi}}{{\mathit f}_{{0}}{(980)}}$ $\rightarrow$ ${{\mathit \phi}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$  not seen  
$\Gamma_{22}$ ${{\mathit D}}{{\overline{\mathit D}}}$  not seen 998
$\Gamma_{23}$ ${{\mathit D}^{0}}{{\overline{\mathit D}}^{0}}$  not seen 998
$\Gamma_{24}$ ${{\mathit D}^{+}}{{\mathit D}^{-}}$  not seen 989
$\Gamma_{25}$ ${{\mathit D}^{*}}{{\overline{\mathit D}}}$ +c.c.  not seen 887
$\Gamma_{26}$ ${{\mathit D}^{*}{(2007)}^{0}}{{\overline{\mathit D}}^{0}}$ +c.c.  not seen  
$\Gamma_{27}$ ${{\mathit D}^{*}{(2010)}^{+}}{{\mathit D}^{-}}$ +c.c.  not seen  
$\Gamma_{28}$ ${{\mathit D}^{*}}{{\overline{\mathit D}}^{*}}$  not seen 657
$\Gamma_{29}$ ${{\mathit D}^{*}{(2007)}^{0}}{{\overline{\mathit D}}^{*}{(2007)}^{0}}$  not seen 668
$\Gamma_{30}$ ${{\mathit D}^{*}{(2010)}^{+}}{{\mathit D}^{*}{(2010)}^{-}}$  not seen 657
$\Gamma_{31}$ ${{\mathit D}}{{\overline{\mathit D}}}{{\mathit \pi}}$ +c.c.   
$\Gamma_{32}$ ${{\mathit D}^{0}}{{\mathit D}^{-}}{{\mathit \pi}^{+}}$ +c.c. (excl. ${{\mathit D}^{*}{(2007)}^{0}}{{\overline{\mathit D}}^{*0}}$ +c.c., ${{\mathit D}^{*}{(2010)}^{+}}{{\mathit D}^{-}}$ +c.c.)  not seen  
$\Gamma_{33}$ ${{\mathit D}}{{\overline{\mathit D}}^{*}}{{\mathit \pi}}$ +c.c. (excl. ${{\mathit D}^{*}}{{\overline{\mathit D}}^{*}}$ )  not seen 723
$\Gamma_{34}$ ${{\mathit D}^{0}}{{\mathit D}^{*-}}{{\mathit \pi}^{+}}$ +c.c. (excl. ${{\mathit D}^{*}{(2010)}^{+}}{{\mathit D}^{*}{(2010)}^{-}}$ )  not seen  
$\Gamma_{35}$ ${{\mathit D}^{0}}{{\mathit D}^{*}{(2010)}^{-}}{{\mathit \pi}^{+}}$ +c.c.  not seen 716
$\Gamma_{36}$ ${{\mathit D}_{{1}}{(2420)}}{{\overline{\mathit D}}}$ + c.c.  not seen -1
$\Gamma_{37}$ ${{\mathit D}^{*}}{{\overline{\mathit D}}^{*}}{{\mathit \pi}}$  not seen 395
$\Gamma_{38}$ ${{\mathit D}_{{s}}^{+}}{{\mathit D}_{{s}}^{-}}$  not seen 774
$\Gamma_{39}$ ${{\mathit D}_{{s}}^{*+}}{{\mathit D}_{{s}}^{-}}$ +c.c.  not seen 615
$\Gamma_{40}$ ${{\mathit D}_{{s}}^{*+}}{{\mathit D}_{{s}}^{*-}}$  not seen 109
$\Gamma_{41}$ ${{\mathit p}}{{\overline{\mathit p}}}$  not seen 1896
$\Gamma_{42}$ ${{\mathit p}}{{\overline{\mathit p}}}{{\mathit \pi}^{0}}$  not seen 1860
$\Gamma_{43}$ ${{\mathit \Xi}^{-}}{{\overline{\mathit \Xi}}^{+}}$  1651
$\Gamma_{44}$ ${{\mathit K}_S^0}$ ${{\mathit K}^{\pm}}{{\mathit \pi}^{\mp}}$  not seen 2037
$\Gamma_{45}$ ${{\mathit K}_S^0}$ ${{\mathit K}^{\pm}}{{\mathit \pi}^{\mp}}{{\mathit \pi}^{0}}$  2014
$\Gamma_{46}$ ${{\mathit K}_S^0}$ ${{\mathit K}^{\pm}}{{\mathit \pi}^{\mp}}{{\mathit \eta}}$  1923
$\Gamma_{47}$ ${{\mathit K}^{+}}{{\mathit K}^{-}}{{\mathit \pi}^{0}}$  not seen 2038