Measurement of the D -> pipi branching fractions
Ammar, Raymond G.
Baringer, Philip S.
Davis, Robin E. P.
AMERICAN PHYSICAL SOC
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Using data from CLEO II at the Cornell Electron Storage Ring we provide a new measurement of the branching fraction for D0 --> pi+pi-, and we present the first measurements of D0 --> pi0pi0 and of D+ --> pi+pi0, which is due to an isospin changing DELTAI = 3/2 transition. From these data we extract the ratio of isospin amplitudes \A2/A0\, and the cosine of the relative phase delta = delta2 - delta0 between these amplitudes, for D --> pipi decays. Unlike the situation in kaon decay where A2 is strongly suppressed, we find \A2/A0\ = 0.72 +/- 0.13 +/- 0.11 and cos delta = 0.14 +/- 0.13 +/- 0.09.
SELEN, M, SADOFF, AJ, et al. Measurement of the D -> pipi branching fractions. PHYSICAL REVIEW LETTERS. September 1993. 71(13) : 1973-1977
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