Measurement of the Ratio of Decay Amplitudes for B0bar -> J/psi K*0 and B0 -> J/psi K*0

Abstract

We have measured the time-dependent decay rate for the process $B\to J/\psi K^{\ast 0}(892)$ in a sample of about 88 million ${\rm Y}(4S)\to B\bar{B}$ 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 $J/\psi K^{\ast 0}$ or $J/\psi {\bar{K}}^{\ast 0}$ final state. We measure the coefficients of the cosine and sine terms in the time-dependent asymmetries for $J/\psi K^{\ast 0}$ and $J/\psi {\bar{K}}^{\ast 0}$, find them to be consistent with the Standard Model expectations, and set upper limits at 90% C.L. on the decay amplitude ratios $|A({\bar{B}}^0\to J/\psi K^{\ast 0})|/|A(B^0\to J/\psi K^{\ast 0})|<0.26$ and $|A(B^0\to J/\psi {\bar{K}}^{\ast 0})|/|A({\bar{B}}^0\to J/\psi {\bar{K}}^{\ast 0})|<0.32$. 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.

6 pages, 2 postscript figures, submitted to Phys. Rev. Lett

References in corpus (3)

• Measurement of the CP-Violating Asymmetry Amplitude sin2beta
• Impact of tag-side interference on time-dependent CP asymmetry measurements using coherent B0 B0bar pairs
• Can the CP asymmetries in $B\to \psi K_S$ and $B\to \psi K_L$ differ?

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