caa a22 4500 445873329 CHVBK 20180317145519.0 cr unu---uuuuu 170323e20111101xx s 000 0 eng 10.1140/epja/i2011-11148-6 doi (NATIONALLICENCE)springer-10.1140/epja/i2011-11148-6 Vector correlators in lattice QCD: Methods and applications [Elektronische Daten] [David Bernecker, Harvey Meyer] We discuss the calculation of the leading hadronic vacuum polarization in lattice QCD. Exploiting the excellent quality of the compiled experimental data for the e + e − → hadrons cross-section, we predict the outcome of large-volume lattice calculations at the physical pion mass, and design computational strategies for the lattice to have an impact on important phenomenological quantities such as the leading hadronic contribution to (g − 2) μ and the running of the electromagnetic coupling constant. First, the R(s) ratio can be calculated directly on the lattice in the threshold region, and we provide the formulae to do so with twisted boundary conditions. Second, the current correlator projected onto zero spatial momentum, in a Euclidean time interval where it can be calculated accurately, provides a potentially critical test of the experimental R(s) ratio in the region that is most relevant for (g − 2) μ . This observation can also be turned around: the vector correlator at intermediate distances can be used to determine the lattice spacing in fm, and we make a concrete proposal in this direction. Finally, we quantify the finite-size effects on the current correlator coming from low-energy two-pion states and provide a general parametrization of the vacuum polarization on the torus. SIF, Springer-Verlag Berlin Heidelberg, 2011 Bernecker David Institut für Kernphysik, Johannes Gutenberg Universität Mainz, 55099, Mainz, Germany aut Meyer Harvey Institut für Kernphysik, Johannes Gutenberg Universität Mainz, 55099, Mainz, Germany aut The European Physical Journal A Springer Berlin Heidelberg 47/11(2011-11-01), 1-16 1434-6001 47:11<1 2011 47 10050 https://doi.org/10.1140/epja/i2011-11148-6 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1140/epja/i2011-11148-6 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Bernecker David Institut für Kernphysik, Johannes Gutenberg Universität Mainz, 55099, Mainz, Germany aut NATIONALLICENCE 700 1- Meyer Harvey Institut für Kernphysik, Johannes Gutenberg Universität Mainz, 55099, Mainz, Germany aut NATIONALLICENCE 773 0- The European Physical Journal A Springer Berlin Heidelberg 47/11(2011-11-01), 1-16 1434-6001 47:11<1 2011 47 10050 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer