Study of the performance of the BaBar Detector using the $e^+e^-\to \varphi \gamma$ control sample

BaBar uses control samples to study the detector behaviors, since their properties are well defined. A study of the energy deposited in the calorimeter will be presented using the control sample $e^+e^-\to \varphi \gamma ,\varphi \to K^+K^-$. This study includes a comparison between data and Monte Carlo to see how well the behavior is simulated. A study of the kaon identification efficiency will also be shown.