EPJ Web Conf.
Volume 175, 201835th International Symposium on Lattice Field Theory (Lattice 2017)
|Number of page(s)
|13 Weak Decays and Matrix Elements
|26 March 2018
Total decay and transition rates from LQCD
Helmholtz Institut Mainz, D-55099 Mainz, Germany.
2 PRISMA Cluster of Excellence and Institut für Kernphysik, Johannes Gutenberg Universität Mainz, D-55099 Mainz, Germany.
3 Institut für Kernphysik, Technische Universität Darmstadt, Schlossgartenstrasse 2, D-62489 Darmstadt, Germany.
Published online: 26 March 2018
We present a new technique for extracting total transition rates into final states with any number of hadrons from lattice QCD. The method involves constructing a finite-volume Euclidean four-point function whose corresponding infinite-volume spectral function gives access to the decay and transition rates into all allowed final states. The inverse problem of calculating the spectral function is solved via the Backus-Gilbert method, which automatically includes a smoothing procedure. This smoothing is in fact required so that an infinite-volume limit of the spectral function exists. Using a numerical toy example we find that reasonable precision can be achieved with realistic lattice data. In addition, we discuss possible extensions of our approach and, as an example application, prospects for applying the formalism to study the onset of deep-inelastic scattering. More details are given in the published version of this work, Ref. .
© The Authors, published by EDP Sciences, 2018
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (http://creativecommons.org/licenses/by/4.0/).
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