${\mathit {\mathit c}}$ ${\mathit {\overline{\mathit c}}}$ MESONS
(including possibly non-${\mathit {\mathit q}}$ ${\mathit {\overline{\mathit q}}}$ states)
INSPIRE   JSON PDGID:
M071

${{\mathit \psi}{(2S)}}$

$I^G(J^{PC})$ = $0^-(1^{- -})$ 
See the Review on ``Branching Ratios of ${{\mathit \psi}{(2S)}}$, ${{\mathit \chi}}_{c0,1,2}$ and ${{\mathit \eta}_{{{c}}}{(1S)}}$'' before the ${{\mathit \chi}_{{{c0}}}{(1P)}}$ Listings.
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${{\mathit \psi}{(2S)}}$ MASS $3686.097$ $\pm0.010$ MeV 
 
${\mathit m}_{{{\mathit \psi}{(2S)}}}-{\mathit m}_{{{\mathit J / \psi}{(1S)}}}$ $589.188$ $\pm0.028$ MeV 
 
${{\mathit \psi}{(2S)}}$ WIDTH $286$ $\pm16$ keV 
 
▸  MULTIPOLE AMPLITUDE RATIOS IN RADIATIVE DECAYS ${{\mathit \psi}{(2S)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \chi}_{{{cJ}}}{(1P)}}$ and ${{\mathit \chi}_{{{cJ}}}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit J / \psi}{(1S)}}$
Mode  
Fraction ($\Gamma_i$ / $\Gamma$) Scale Factor/
Conf. Level
P(MeV/c)  
$\Gamma_{1}$ hadrons ($97.85$ $\pm0.13$ ) $\%$  
 
$\Gamma_{2}$ virtual ${{\mathit \gamma}}$ $\rightarrow$ hadrons ($1.79$ $\pm0.04$ ) $\%$  
 
$\Gamma_{3}$ ${{\mathit g}}{{\mathit g}}{{\mathit g}}$ ($10.6$ $\pm1.6$ ) $\%$  
 
$\Gamma_{4}$ ${{\mathit \gamma}}{{\mathit g}}{{\mathit g}}$ ($1.03$ $\pm0.29$ ) $\%$  
 
$\Gamma_{5}$ light hadrons ($15.4$ $\pm1.5$ ) $\%$  
 
$\Gamma_{6}$ ${{\mathit K}_S^0}$ anything ($16.0$ $\pm1.1$ ) $\%$  
 
$\Gamma_{7}$ ${{\mathit e}^{+}}{{\mathit e}^{-}}$ ($7.94$ $\pm0.22$) $ \times 10^{-3}$ S=1.3  1843
 
$\Gamma_{8}$ ${{\mathit \mu}^{+}}{{\mathit \mu}^{-}}$ ($8.0$ $\pm0.6$) $ \times 10^{-3}$ 1840
 
$\Gamma_{9}$ ${{\mathit \tau}^{+}}{{\mathit \tau}^{-}}$ ($3.1$ $\pm0.4$) $ \times 10^{-3}$ 489
 
▸  Decays into ${{\mathit J / \psi}{(1S)}}$ and anything
▸  Hadronic decays
▸  Radiative decays
▸  Weak decays
▸  Other decays
[1] ${{\mathit \Theta}{(1540)}}$ is a hypothetical pentaquark state of 1.54 GeV/c${}^{2}$ mass and a width of less than 25 MeV/c${}^{2}$.
[2] See the ``Note on the ${{\mathit \eta}{(1405)}}$'' in the ${{\mathit \eta}{(1405)}}$ Particle Listings.
[3] For a narrow resonance in the range 2.2 $<$ ${{\mathit M}}({{\mathit X}}$) $<$ 2.8 GeV.
Constrained Fit information