Mass corrections to the vector current correlator

Mass Corrections to the Vector Current Correlator †

Three-loop QCD corrections to the vector current correlator are considered. The large momentum procedure is applied in order to evaluate mass corrections up to order (m2/q2)6. The inclusion of the first seven terms to the ratio R = σ(e+e− → hadrons)/σ(e+e− → μ+μ−) leads to reliable predictions from the high energy region down to relatively close to threshold. PACS numbers: 12.38.-t, 12.38.Bx, 1...

The Vector Current Correlator

O(αs) corrections to the correlator of finite mass baryon currents

We present analytical next-to-leading order results for the correlator of baryonic currents at the three loop level with one finite mass quark. We obtain the massless and the HQET limit of the correlator from the general formula as particular cases. We also give explicit expressions for the moments of the spectral density. Baryons are an important source of information on QCD interactions. Mass...

Mass Corrections of Vector Meson Distribution Amplitudes

A model-independent way of computing the mass corrections of vectormeson distribution amplitudes is given. The method is based on resummation of (next-to-)leading twist local operator. Key-Words: Distribution amplitude, Twist. September 1999 CPT-99/P.3892 anonymous ftp : ftp.cpt.univ-mrs.fr web : www.cpt.univ-mrs.fr ∗Unité Propre de Recherche 7061

The Mixed - Isospin Vector Current Correlator in ChiralPerturbation Theory and QCD

The mixed-isospin vector current correlator, h0jT(V V !)j0i is evaluated using both QCD sum rules and Chiral Perturbation Theory (ChPT) to one-loop order. The sum rule treatment is a modiication of previous analyses necessitated by the observation that those analyses produce forms of the correlator that fail to be dominated, near q 2 = 0, by the most nearby singularities. Inclusion of contribut...