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- QCD_sum_rules abstract "Instead of a model-dependent treatment in terms of constituent quarks, hadronsare represented by their interpolating quark currents taken at large virtualities.The correlation function of these currents is introduced and treated inthe framework of the operator product expansion (OPE), where the short andlong-distance quark-gluon interactions are separated. The former are calculatedusing QCD perturbation theory, whereas the latter are parametrized interms of universal vacuum condensates or light-cone distribution amplitudes.The result of the QCD calculation is then matched, via dispersion relation, toa sum over hadronic states. The sum rule obtained in this way allows to calculateobservable characteristics of the hadronic ground state. Inversely, theparameters of QCD such as quark masses and vacuum condensate densitiescan be extracted from sum rules which have experimentally known hadronicparts. What is also very important, the interactions of quark-gluon currentswith QCD vacuum fields critically depend on the quantum numbers (spinparity,flavor content) of these currents.In quantum chromodynamics, the confining and strong coupling nature of the theory means that conventional perturbative techniques often fail to apply. The QCD sum rules (or Shifman–Vainshtein–Zakharov sum rules) are a way of dealing with this. The idea is to work with gauge invariant operators and operator product expansions of them. The vacuum to vacuum correlation function for the product of two such operators can be reexpressed aswhere we have inserted hadronic particle states on the right hand side.".
- QCD_sum_rules wikiPageExternalLink 9802214.
- QCD_sum_rules wikiPageExternalLink 1.
- QCD_sum_rules wikiPageExternalLink Shifman-Vainshtein-Zakharov_sum_rule.
- QCD_sum_rules wikiPageID "18327991".
- QCD_sum_rules wikiPageRevisionID "603214049".
- QCD_sum_rules hasPhotoCollection QCD_sum_rules.
- QCD_sum_rules subject Category:Quantum_chromodynamics.
- QCD_sum_rules comment "Instead of a model-dependent treatment in terms of constituent quarks, hadronsare represented by their interpolating quark currents taken at large virtualities.The correlation function of these currents is introduced and treated inthe framework of the operator product expansion (OPE), where the short andlong-distance quark-gluon interactions are separated.".
- QCD_sum_rules label "QCD sum rules".
- QCD_sum_rules label "Правила сумм (квантовая хромодинамика)".
- QCD_sum_rules sameAs m.04cygjn.
- QCD_sum_rules sameAs Q4375892.
- QCD_sum_rules sameAs Q4375892.
- QCD_sum_rules wasDerivedFrom QCD_sum_rules?oldid=603214049.
- QCD_sum_rules isPrimaryTopicOf QCD_sum_rules.