TWIST Technote 57

A procedure for fitting TWIST spectra using Spectral Basis Sets

Nate Rodning and Andrei Gaponenko, February 2002

A procedure for fitting TWIST spectra for the extraction of the Michel parameters is described. The procedure has the advantages that:

- Details of the acceptance, of secondary processes, resolution and response, and performance of the tracking are incorporated naturally to the extent that we are able to include these in the simulation.

- The effects of the contributions of each parameter, and of radiative corretions, are isolated. This means that small effects such as the contribution of a non-zero eta are not lost in the statistical precision of the simulations.

- The procedure may lend itself to the implementation of a blind analysis.