Search for the CP-violating decays $Υ(4S) B0\bar{B}0 J/K0_S + J/ψ(η_c)K0_S$

Details Search for the CP-violating decays $Υ(4S) B0\bar{B}0 J/K0_S + J/ψ(η_c)K0_S$ Search for the CP-violating decays $Υ(4S) B0\bar{B}0 J/K0_S + J/ψ(η_c)K0_S$

2007-07-30

arxiv.org/abs/0707.4336v1

Phys.Rev.Lett.99:211601,2007

Physics

High Energy Physics

High Energy Physics - Experiment

Submitted to PRL

Scientific paper

10.1103/PhysRevLett.99.211601

We report the first search for CP violating decays of the $\Upsilon(4S)$ using a data sample that contains 535 million $\Upsilon(4S)$ mesons with the Belle detector at the KEKB asymmetric-energy e^+ e^- collider. A partial reconstruction technique is employed to enhance the signal sensitivity. No significant signals were observed. We obtain an upper limit of $4 \times 10^{-7}$ at the 90 % confidence level for the branching fractions of the $CP$ violating modes, $\Upsilon(4S) \to B^0\bar{B}^0 \to J/\psi K^0_S + J/\psi(\eta_c) K^0_S$. Extrapolating the result, we find that an observation with 5$\sigma$ significance is expected with a 30 ab^{-1} data sample, which is within the reach of a future super B factory.

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