New Measurements of the D+ to K* mu nu Form Factor Ratios
The FOCUS Collaboration
TL;DR
This paper reports new measurements of the form factor ratios rv and r2 in D+ to K* mu nu decays, using a large dataset from Fermilab, including effects of s-wave interference, providing improved precision over previous results.
Contribution
It provides the first precise measurements of rv and r2 form factor ratios in D+ semileptonic decays with s-wave interference effects included.
Findings
rv = 1.504 ± 0.057 ± 0.039
r2 = 0.875 ± 0.049 ± 0.064
Results improve understanding of D+ decay dynamics
Abstract
Using a large sample of D+ to K- pi+ 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 = 1.504 \pm 0.057 \pm 0.039 and r2 = 0.875 \pm 0.049 \pm 0.064. Our form factor results include the effects of the s-wave interference discussed in a previous paper.
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