M. Lambrecht

Measurement of the form factors for B-bar0-->D*+

Using a sample of 2.6 x 10{sup 67} {Upsilon}(4S) {yields} B{bar B} events collected with the CLEO II detector at the Cornell Electron Storage Ring, we have measured the form factors for {bar B}{sup 0} {yields} D*{sup +}{ell}{sup -}{bar {nu}}. We perform a three-parameter fit to the joint distribution of four kinematic variables to obtain the form factor ratios R{sub 1} = 1.18 {+-} 0.30 {+-} 0.12 and R{sub 2} = 0.71 {+-} 0.22 {+-} 0.07; and the form-factor slope {rho}{sub A{sub 1}}{sup 2} = 0.91 {+-} 0.15 {+-} 0.06, which is closely related to the slope of the Isgur-Wise function. The form factor ratios are consistent with predicted corrections to the heavy-quark symmetry limit of R{sub 1} = R{sub 2} = 1.

Measurement of the [ital D][r arrow][pi][pi] branching fractions

Using data from CLEO II at the Cornell Electron Storage Ring we provide a new measurement of the branching fraction for [ital D][sup 0][r arrow][pi][sup +][pi][sup [minus]], and we present the first measurements of [ital D][sup 0][r arrow][pi][sup 0][pi][sup 0] and of [ital D][sup +][r arrow][pi][sup +][pi][sup 0], which is due to an isospin changing [Delta][ital I]=3/2 transition. From these data we extract the ratio of isospin amplitudes [vert bar][ital A][sub 2]/[ital A][sub 0][vert bar], and the cosine of the relative phase [delta]=[delta][sub 2][minus][delta][sub 0] between these amplitudes, for [ital D][r arrow][pi][pi] decays. Unlike the situation in kaon decay where [ital A][sub 2] is strongly suppressed, we find [vert bar][ital A][sub 2]/[ital A][sub 0][vert bar]=0.72[plus minus]0.13[plus minus]0.11 and cos[delta]=0.14[plus minus]0.13[plus minus]0.09.

D sub s sup + decays to. eta. rho. sup + ,. eta. prime. rho. sup + , and. phi. rho. sup +

We have observed the previously unseen {eta}{rho}{sup +} and {eta}{prime}{rho}{sup +} decay model of the {ital D}{sub {ital s}}{sup +}, and measured branching ratios relative to the {phi}{pi}{sup +} mode of 2.86{plus minus}0.38{sub {minus}0.38}{sup +0.36} and 3.44{plus minus}0.62{sub {minus}0.46}{sup +0.44}, respectively. In addition, the relative branching ratio for the decay into {phi}{rho}{sup +} is measured as 1.86{plus minus}0.26{sub {minus}0.40}{sup +0.29}. Combining these new measurements with previous results and those in the preceding Letter, we account for {approx}(79{plus minus}26)% of {ital D}{sub {ital s}} decays.

Ds+ decays to, +, and +

Using the CLEO II detector, we have accurately measured {ital D}{sub {ital s}} decay branching ratios relative to the {phi}{pi}{sup +} mode for the {eta}{pi}{sup +} and {eta}{prime}{pi}{sup +} states, for which there are conflicting claims; our results are 0.54{plus minus}0.09{plus minus}0.06 and 1.20{plus minus}0.15{plus minus}0.11, respectively.