QUARKS INSPIRE   JSON PDGID:
Q004

${\mathit {\mathit c}}$

$I(J^P)$ = $0(1/2^{+})$ 
  Charge = ${2\over 3}$ $\mathit e$ Charm = $+$1
${\mathit {\mathit c}}$-QUARK MASS [1] $1.2730$ $\pm0.0028$ GeV 
 
${\mathit m}_{{{\mathit c}}}/{\mathit m}_{{{\mathit s}}}$ MASS RATIO $11.761$ $\pm0.028$  (S = 1.2)
 
${\mathit m}_{{{\mathit b}}}/{\mathit m}_{{{\mathit c}}}$ MASS RATIO $4.58$ $\pm0.01$  
 
${\mathit m}_{{{\mathit b}}}−{\mathit m}_{{{\mathit c}}}$ QUARK MASS DIFFERENCE $3.45$ $\pm0.05$ GeV 
 
[1] The ${{\mathit c}}$- and ${{\mathit b}}$-quark masses are estimated from charmonium, bottomonium, ${{\mathit D}}$, and ${{\mathit B}}$ masses. They are the ``running'' masses in the $\overline{\rm{}MS}$ scheme.