Study of time-dependent CP violation in B0 -> J/Psi pi0 decays

Details Study of time-dependent CP violation in B0 -> J/Psi pi0 decays Study of time-dependent CP violation in B0 -> J/Psi pi0 decays

2004-08-23

arxiv.org/abs/hep-ex/0408105v2

Phys.Rev.Lett.93:261801,2004

Physics

High Energy Physics

High Energy Physics - Experiment

5 pages, 2 figures, submitted to PRL

Scientific paper

10.1103/PhysRevLett.93.261801

We report a measurement of CP asymmetry parameters in the decay B0(B0bar) -> J/Psi pi0, which is governed by the b->c cbar d transition. The analysis is based on a 140/fb data sample accumulated at the Upsilon(4S) resonance by the belle detector at the KEKB asymmetric-energy e+e- collider. We fully reconstruct one neutral B meson in the J/Psi pi0 final state. The accompanying B meson flavor is identified by its decay products. From the distribution of proper time intervals between the two B decays, we obtain the following CP-violating parameters: S_{J/Psi pi0}=-0.72+-0.42+-0.09 and A_{J/Psi pi0}=-0.01 +-0.29+-0.03.

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