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

TL;DR

This study measures decay amplitude ratios in B meson decays to J/psi K*0, testing Standard Model predictions with data from BaBar, and sets upper limits on these ratios at 90% confidence level.

Contribution

First measurement of decay amplitude ratios for B0 and B0bar decays to J/psi K*0 using time-dependent analysis at BaBar.

Findings

Decay amplitude ratios are constrained to be less than 0.26 and 0.32 at 90% C.L.

Results are consistent with Standard Model expectations.

Upper limit of 0.25 at 90% C.L. for combined wrong-flavor to favored amplitude ratio.

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.