QUARKS INSPIRE   JSON PDGID:
Q123

Light Quarks (${\mathit {\mathit u}}$, ${\mathit {\mathit d}}$, ${\mathit {\mathit s}}$)

 
See related review:
Quark Masses
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${\mathit {\mathit u}}$-QUARK MASS $2.16$ $\pm0.04$ MeV (S = 1.2)
 
${\mathit {\mathit d}}$-QUARK MASS $4.70$ $\pm0.04$ MeV 
 
${{\overline{\mathit m}}}$ = (${\mathit m}_{{{\mathit u}}}+{\mathit m}_{{{\mathit d}}})/$2 $3.49$ $\pm0.04$ MeV (S = 1.2)
 
${\mathit m}_{{{\mathit u}}}/{\mathit m}_{{{\mathit d}}}$ MASS RATIO $0.462$ $\pm0.013$  
 
${\mathit {\mathit s}}$-QUARK MASS $93.5$ $\pm0.5$ MeV (S = 1.1)
 
▸  OTHER LIGHT QUARK MASS RATIOS