New Measurements of Upsilon Spin Alignment at CDF

We report the first measurement that fully specifies in three dimensions the angular distributions of muons from \(\Upsilon(1S,2S,3S)\) resonances produced in \(1.96\,\mathrm{TeV}\) \(p\bar{p}\) collisions and reconstructed by the Collider Detector at Fermilab. These measurements have been performed using multiple coordinate frames, allowing tests of self-consistency to be performed, and provide the first measurements of the \(\Upsilon(3S)\) spin alignment. The results, which use \(7\,\mathrm{fb}^{-1}\) of data, offer detailed information to shed light on the puzzling picture of previous experimental measurements and theory predictions.