${\mathit {\mathit c}}$ ${\mathit {\overline{\mathit c}}}$ MESONS
(including possibly non-${\mathit {\mathit q}}$ ${\mathit {\overline{\mathit q}}}$ states) 		INSPIRE   JSON PDGID:
M070

${{\mathit J / \psi}{(1S)}}$

$I^G(J^{PC})$ = $0^-(1^{- -})$ 
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${{\mathit J / \psi}{(1S)}}$ MASS $3096.900$ $\pm0.006$ MeV 
 
${{\mathit J / \psi}{(1S)}}$ WIDTH $92.6$ $\pm1.7$ keV (S = 1.1)
 
Mode  
Fraction ($\Gamma_i$ / $\Gamma$) Scale Factor/
Conf. Level		 P(MeV/c)  
$\Gamma_{1}$ hadrons ($87.7$ $\pm0.5$ ) $\%$  
 
$\Gamma_{2}$ virtual ${{\mathit \gamma}}$ $\rightarrow$ hadrons ($13.46$ $\pm0.07$ ) $\%$  
 
$\Gamma_{3}$ ${{\mathit g}}{{\mathit g}}{{\mathit g}}$ ($64.1$ $\pm1.0$ ) $\%$  
 
$\Gamma_{4}$ ${{\mathit \gamma}}{{\mathit g}}{{\mathit g}}$ ($8.8$ $\pm1.1$ ) $\%$  
 
$\Gamma_{5}$ ${{\mathit e}^{+}}{{\mathit e}^{-}}$ ($5.971$ $\pm0.032$ ) $\%$ 1548
 
$\Gamma_{6}$ ${{\mathit e}^{+}}{{\mathit e}^{-}}{{\mathit \gamma}}$ [1] ($8.8$ $\pm1.4$) $ \times 10^{-3}$ 1548
 
$\Gamma_{7}$ ${{\mathit \mu}^{+}}{{\mathit \mu}^{-}}$ ($5.961$ $\pm0.033$ ) $\%$ 1545
 
$\Gamma_{8}$ ${{\mathit e}^{+}}{{\mathit e}^{-}}{{\mathit e}^{+}}{{\mathit e}^{-}}$ ($5.5$ $\pm0.5$) $ \times 10^{-5}$ 1548
 
$\Gamma_{9}$ ${{\mathit e}^{+}}{{\mathit e}^{-}}{{\mathit \mu}^{+}}{{\mathit \mu}^{-}}$ ($3.53$ $\pm0.26$) $ \times 10^{-5}$ 1545
 
$\Gamma_{10}$ ${{\mathit \mu}^{+}}{{\mathit \mu}^{-}}{{\mathit \mu}^{+}}{{\mathit \mu}^{-}}$ ($1.11$ $\pm0.11$) $ \times 10^{-6}$ 1530
 
▸  Decays involving hadronic resonances
▸  Decays into stable hadrons
▸  Radiative decays
▸  Dalitz decays
▸  Weak decays
▸  Charge conjugation ($\mathit C$), Parity ($\mathit P$), Lepton Family number ($\mathit LF$) violating modes
▸  Other decays
[1] For $\mathit E_{{{\mathit \gamma}}}$ $>$ 100 MeV.
[2] The value is for the sum of the charge states or particle/antiparticle states indicated.
[3] ${{\mathit \Theta}{(1540)}}$ is a hypothetical pentaquark state of 1.54 GeV/c${}^{2}$ mass and a width of less than 25 MeV/c${}^{2}$.
[4] Includes ${{\mathit p}}{{\overline{\mathit p}}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \gamma}}$ and excludes ${{\mathit p}}{{\overline{\mathit p}}}{{\mathit \eta}}$, ${{\mathit p}}{{\overline{\mathit p}}}{{\mathit \omega}}$, ${{\mathit p}}{{\overline{\mathit p}}}{{\mathit \eta}^{\,'}}$.
[5] See the ``Note on the ${{\mathit \eta}{(1405)}}$'' in the ${{\mathit \eta}{(1405)}}$ Particle Listings.
[6] For a narrow state ${{\mathit A}}$ with mass less than 960 MeV.
[7] For a narrow scalar or pseudoscalar ${{\mathit A}^{0}}$ with mass $0.21 - 3.0$ GeV.
[8] For a dark photon ${{\mathit U}}$ with mass between 100 and 2100 MeV.
Constrained Fit information