Charm-quark mass from weighted finite energy QCD sum rules
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# Charm-quark mass from weighted finite energy QCD sum rules

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 Bodenstein, Sebastian; Bordes Villagrasa, José M.; Domínguez, Cesáreo A.; Peñarrocha Gantes, José Antonio; Schilcher, K. This document is a artículoDate2010 Este documento está disponible también en : http://hdl.handle.net/10550/42730 The running charm-quark mass in the MS¯ scheme is determined from weighted finite energy QCD sum rules (FESR) involving the vector current correlator. Only the short distance expansion of this correlator is used, together with integration kernels (weights) involving positive powers of s, the squared energy. The optimal kernels are found to be a simple {\it pinched} kernel, and polynomials of the Legendre type. The former kernel reduces potential duality violations near the real axis in the complex s-plane, and the latter allows to extend the analysis to energy regions beyond the end point of the data. These kernels, together with the high energy expansion of the correlator, weigh the experimental and theoretical information differently from e.g. inverse moments FESR. Current, state of the art results for the vector correlator up to four-loop order in perturbative QCD are used in the FES... [Leer más...] [-] The running charm-quark mass in the MS¯ scheme is determined from weighted finite energy QCD sum rules (FESR) involving the vector current correlator. Only the short distance expansion of this correlator is used, together with integration kernels (weights) involving positive powers of s, the squared energy. The optimal kernels are found to be a simple {\it pinched} kernel, and polynomials of the Legendre type. The former kernel reduces potential duality violations near the real axis in the complex s-plane, and the latter allows to extend the analysis to energy regions beyond the end point of the data. These kernels, together with the high energy expansion of the correlator, weigh the experimental and theoretical information differently from e.g. inverse moments FESR. Current, state of the art results for the vector correlator up to four-loop order in perturbative QCD are used in the FESR, together with the latest experimental data. The integration in the complex s-plane is performed using three different methods, fixed order perturbation theory (FOPT), contour improved perturbation theory (CIPT), and a fixed renormalization scale μ (FMUPT). The final result is m¯c(3GeV)=1008±26MeV, in a wide region of stability against changes in the integration radius s0 in the complex s-plane. Bodenstein, Sebastian Bordes Villagrasa, José M. Domínguez, Cesáreo A. Peñarrocha Gantes, José Antonio Schilcher, K. 2010 Charm-quark mass from weighted finite energy QCD sum rules Physical Review D 82 11 114013 http://dx.doi.org/10.1103/PhysRevD.82.114013