# Measurement of $cos2\beta$ in $B^0 \to D^{(*)}h^0$ Decays with a Time-Dependent Dalitz Plot Analysis of $D \to K^0_S \pi^+\pi^-$

Abstract : We study the time-dependent Dalitz plot of D->KSpi+pi- in B0->D(*)h0 decays, where h0 is a pi0, eta, eta', or omega meson and D*->Dpi0 using a data sample of 383 X 10^6 Upsilon(4S)->BBbar decays collected with the BABAR detector. We determine cos2beta = 0.42+-0.49+-0.09+-0.13, sin2beta = 0.29+-0.34+-0.03+-0.05, and |lambda| = 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 sin2beta and |lambda|=1, cos2beta>0 is preferred over cos2beta<0 at 86% confidence level.
Document type :
Journal articles

http://hal.in2p3.fr/in2p3-00169736
Contributor : Claudine Bombar <>
Submitted on : Tuesday, September 4, 2007 - 4:48:33 PM
Last modification on : Saturday, May 22, 2021 - 3:33:43 AM

### Citation

B. Aubert, M. Bona, D. Boutigny, Y. Karyotakis, J.P. Lees, et al.. Measurement of $cos2\beta$ in $B^0 \to D^{(*)}h^0$ Decays with a Time-Dependent Dalitz Plot Analysis of $D \to K^0_S \pi^+\pi^-$. Physical Review Letters, American Physical Society, 2007, 99, pp.231802. ⟨10.1103/PhysRevLett.99.231802⟩. ⟨in2p3-00169736⟩

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