New Measurements of the Ds to Phi mu nu Form Factor Ratios

The FOCUS Collaboration

doi:10.1016/j.physletb.2004.02.015

paper

New Measurements of the Ds to Phi mu nu Form Factor Ratios

arXiv:hep-ex/0401001 · doi:10.1016/j.physletb.2004.02.015

Abstract

Using a large sample of Ds to Phi mu nu decays collected by the FOCUS photoproduction experiment at Fermilab, we present new measurements of two semileptonic form factor ratios: rV and r2. We find rV = 1.549 \pm 0.250 \pm 0.145 and r2 = 0.713 \pm 0.202 \pm 0.266. These values are consistent with the rV and r2 form factors measured for the process D+ to K*bar mu nu.

11 pages 5 figures