Abstract: Workshop @ PSI

["Bernhard Lauss" <lauss@ill.fr>]

Dear Peter & Claude,

For teh PSI workshop I want to send the abstract below.
Corrections and suggestions are welcome.

Thanks
   Bernhard


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Precision Measurement of Muon Capture on the Deuteron


Solar neutrino experiments have directed considerable theoretical
attention towards the electro-weak interaction of
deuterons with leptonic currents.Effective field theory (EFT) showed
that up to NNLO, all low-energy weak interaction deuteron breakup
processes depend on a common
isovector axial two-body current,parametrized by L_1,A.
This description provides links pp-fusion, solar hep-processes and triton
beta-decay
to nuclear muon capture: mu- + d --> n + n + mu_neutrino.
Among the two-nucleon reactions, a 1% measurement of the muon capture rate
from
the deuteron doublet state promises the by far highest accuracy
in the determination of L_1,A,and can provide the most accurate measurement
of an electro-weak reaction in a two-nucleon system.
Such a dramatic increase in precision appears possible by
the new technique developed for the MuCAP experiment.
Our collaboration is considering a measurement of deuteron capture rate
via the lifetime method and, with an extended setup, of the
differential rate contributions to check EFT calculations in detail.


MuCAP Collaboration: PNPI - PSI - UC Berkeley - UI Urbana-Champaign - UC
de Louvain - Boston University - UK Lexington

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-- 
Bernhard Lauss
Institut Laue-Langevin
6, Rue Jules Horowitz, BP 156
38042 Grenoble
France
Tel: +33 (0)4 76 20 71 34
Fax: +33 (0)4 76 20 77 77
email: lauss@ill.fr