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# Bound on the Ratio of Decay Amplitudes for $\bar{B^0} \to J/\psi K^{*0}$ and $B^0 \to J/\psi K^{*0}$

Abstract : We have measured the time-dependent decay rate for the process $B \to J/\psi K^{*0}(892)$ in a sample of about 88 million $\Upsilon(4S) \to B\bar{B}$ decays collected with the BaBar detector at the PEP-II asymmetric-energy $B$ Factory at SLAC. In this sample we study flavor-tagged events in which one neutral $B$ meson is reconstructed in the $J/\psi K^{*0}$ or $J/\psi \bar{K}^{*0}$ final state. We measure the coefficients of the cosine and sine terms in the time-dependent asymmetries for $J/\psi K^{*0}$ and $J/\psi \bar{K}^{*0}$, find them to be consistent with the Standard Model expectations, and set upper limits at 90% C.L. on the decay amplitude ratios $|A (\bar{B}^0 \to J/\psi K^{*0})|/|A (B^0 \to J/\psi K^{*0})| < 0.26$ and $|A (B^0 \to J/\psi \bar{K}^{*0})|/|A (\bar{B}^0 \to J/\psi \bar{K}^{*0})| <0.32$. For a single ratio of wrong-flavor to favored amplitudes for $B^0$ and $\bar{B}^0$ combined, we obtain an upper limit of 0.25 at 90% C.L.
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Journal articles
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http://hal.in2p3.fr/in2p3-00023537
Contributor : Claudine Bombar Connect in order to contact the contributor
Submitted on : Friday, January 7, 2005 - 2:14:10 PM
Last modification on : Tuesday, January 25, 2022 - 12:48:06 PM

### Citation

B. Aubert, R. Barate, D. Boutigny, F. Couderc, J.M. Gaillard, et al.. Bound on the Ratio of Decay Amplitudes for $\bar{B^0} \to J/\psi K^{*0}$ and $B^0 \to J/\psi K^{*0}$. Physical Review Letters, American Physical Society, 2004, 93, pp.081801. ⟨10.1103/PhysRevLett.93.081801⟩. ⟨in2p3-00023537⟩

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