Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2010-05-20
Int.J.Mod.Phys.A25:5223-5234,2010
Physics
High Energy Physics
High Energy Physics - Phenomenology
Plenary talk at the Conference in honour of Murray Gell-Mann's 80th birthday, Nanyang Technical University, Singapore, Februar
Scientific paper
10.1142/S0217751X10051116
The standard procedure to determine (analytically) the values of the quark masses is to relate QCD two-point functions to experimental data in the framework of QCD sum rules. In the case of the light quark sector, the ideal Green function is the pseudoscalar correlator which involves the quark masses as an overall multiplicative factor. For the past thirty years this method has been affected by systematic uncertainties originating in the hadronic resonance sector, thus limiting the accuracy of the results. Recently, a major breakthrough has been made allowing for a considerable reduction of these systematic uncertainties and leading to light quark masses accurate to better than 8%. This procedure will be described in this talk for the up-, down-, strange-quark masses, after a general introduction to the method of QCD sum rules.
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