# B --> rho K* decays and other rare vector-vector modes

## TL;DR

This paper reviews recent experimental results on rare B meson decays into vector-vector final states, highlighting polarization patterns that differentiate penguin and tree-dominated processes.

## Contribution

It provides updated measurements of polarization fractions in various rare B decay modes, enhancing understanding of decay dynamics and CP violation.

## Key findings

- Longitudinal polarization ~0.5 in penguin modes
- Longitudinal polarization close to 1 in tree modes
- Improved experimental constraints on rare decay channels

## Abstract

The recent analyses of the following rare vector-vector decays of the B meson are presented: rho K*, omega K*, omega rho, omega omega, and omega phi charmless final states. The latest results indicate that the fraction of longitudinal polarization is about 0.5 in penguin-dominated modes and close to 1 for tree-dominated modes.