18-24 June 2017
Palacio de Congresos
Europe/Madrid timezone
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Contribution Parallel

Seminarios 6+7
Weak Decays and Matrix Elements

Total decay and transition rates from LQCD: (I) The method and a numerical test


  • Dr. Daniel ROBAINA

Primary authors


I 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 out-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. This is the first part of a two-part talk, with the second part presented by Maxwell T. Hansen.

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Weak Decays and Matrix Elements