We study the time-dependent Dalitz plot of D→KS0π+π- in B0→D(*)h0 decays, where h0 is a π0, η, η′, or ω meson and D*→Dπ0, using a data sample of 383×10^6 Υ(4S)→BB̅ decays collected with the BABAR detector. We determine cos2β=0.42±0.49±0.09±0.13, sin2β=0.29±0.34±0.03±0.05, and |λ|=1.01±0.08±0.02, where the first error is statistical, the second is the experimental systematic uncertainty, and the third, where given, is the Dalitz model uncertainty. Assuming the world average value for sin2β and |λ|=1, cos2β>0 is preferred over cos2β<0 at 86% confidence level.
Measurement of cos2β in B0→D(*)h0 Decays with a Time-Dependent Dalitz Plot Analysis of D→Ks0π+π-
SIMI, GABRIELE;GAZ A;MARGONI, MARTINO;SIMONETTO, FRANCO;STROILI, ROBERTO;VOCI, CESARE;
2007
Abstract
We study the time-dependent Dalitz plot of D→KS0π+π- in B0→D(*)h0 decays, where h0 is a π0, η, η′, or ω meson and D*→Dπ0, using a data sample of 383×10^6 Υ(4S)→BB̅ decays collected with the BABAR detector. We determine cos2β=0.42±0.49±0.09±0.13, sin2β=0.29±0.34±0.03±0.05, and |λ|=1.01±0.08±0.02, where the first error is statistical, the second is the experimental systematic uncertainty, and the third, where given, is the Dalitz model uncertainty. Assuming the world average value for sin2β and |λ|=1, cos2β>0 is preferred over cos2β<0 at 86% confidence level.
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