Weak phase information from the color suppressed B_d^0 -> D^{*0} K^{*0} modes

TL;DR

This paper explores using color-suppressed B_d^0 decays to D^{*0} K^{*0} for extracting weak phase information, offering a penguin-free approach that could help determine the CKM phase gamma.

Contribution

It proposes a novel method utilizing specific decay channels free from penguin contributions to measure the CKM phase gamma.

Findings

Branching ratios are around 10^{-5} to 10^{-6}.

Decay channels are accessible at current B factories.

Method could effectively determine the phase gamma.

Abstract

The decay channels $B_d^0 \to D^{*0} K^{*0}$ are investigated for extracting weak $CKM$ phase information. These channels are described by color-suppressed tree diagrams only and are free from penguin contributions. The branching ratios for these channels are found to be $\sim \cal O $ $(10^{-5} - 10^{-6})$ which can be measured at the currently running $B$ factories. The method presented here may be well-suited to determine the phase $\gamma$.