# Measurement of Decay Amplitudes of B -->(c cbar) Kstar with an Angular Analysis, for (c cbar)=J/psi, psi(2S) and chi_c1

## TL;DR

This study measures decay amplitudes of B mesons into charmonium states and K* mesons using angular analysis, revealing polarization differences and no CP violation in the processes.

## Contribution

First three-dimensional measurement of B decays to (2S) K* and 1 K* states, updating previous results for J/ K* with a large data sample.

## Key findings

- Longitudinal polarization is larger for 1 than for J/ or (2S).
- No evidence of direct CP violation observed.
- Measurements improve understanding of decay dynamics.

## Abstract

We perform the first three-dimensional measurement of the amplitudes of $B\to \psi(2S) K^*$ and $B\to \chi_{c1} K^*$ decays and update our previous measurement for $B\to J/\psi K^*$. We use a data sample collected with the BaBar detector at the PEP2 storage ring, corresponding to 232 million $B\bar B$ pairs. The longitudinal polarization of decays involving a $J^{PC}=1^{++}$ $\chi_{c1}$ meson is found to be larger than that with a $1^{--}$ $J/\psi$ or $\psi(2S)$ meson. No direct {\it CP}-violating charge asymmetry is observed.