Determination Of The Up/down-quark Mass Within QCD Sum Rules In The Scalar Channel

In this work,we determine up/down-quark mass8)₍=/（9）in the isoscalar scalar channel from both the SVZ and the Monte-Carlo-based QCD sum rules.The relevant spectral function,including the contributions from the f₀（500）,f₀（980）and f₀（1370）resonances,is determined from a sophisticated U（3）chiral study.Via the traditional SVZ QCD sum rules,we give the prediction to light-quark mass m_q（2 Ge V）=₂¹（m_u（2 Ge V）+m_d（2 Ge V））=3.44±0.06 Me V.Meanwhile,by considering the uncertainties of the input QCD parameters and the spectral function of the isoscalar scalar channel,we obtain m_q（2 Ge V）=3.51±0.14±0.33 Me V from the Monte-Carlo-based QCD sum rules.Both results are perfectly consistent with each other,and also compatible with the Particle Data Group value within the errors.