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May 6 – 10, 2019
Canada/Pacific timezone

First look at time dependent CP violation using early Belle II data

May 7, 2019, 5:00 PM
Elliott 162

Elliott 162

Contributed Oral CP Violation in Hadrons and Leptons Parallel session 2


Dr Stefano Lacaprara (INFN Padova)


The Belle II experiment at the SuperKEKB energy-asymmetric $e^+ e^-$ collider is a substantial upgrade of the B factory facility at the Japanese KEK laboratory. The design luminosity of the machine is $8\times 10^{35}$ cm$^{-2}$s$^{-1}$ and the Belle II experiment aims to record 50 ab$^{-1}$ of data, a factor of 50 more than its predecessor. From February to July 2018, the machine has completed a commissioning run, achieved a peak luminosity of $5.5\times 10^{33}$ cm$^{-2}$s$^{-1}$, and Belle II has recorded a data sample of about 0.5 fb$^{-1}$. Main operation of SuperKEKB has started in March 2019. This early data set is used to establish the performance of the detector in terms of reconstruction efficiency of final states of interest for the measurement of time dependent CP violation, such as $J/\psi K^{(*)0}$, $\eta' K_s$, and $\phi K_s$. A first assessment of the B flavor tagging capabilities of the experiment will be given, along with estimates of the Belle II sensitivity to the CKM angles $\phi_1/\beta$ and $\phi_2/\alpha$ and to potential New Physics contributions in penguin amplitudes dominated decays and in $b\to s\gamma$ transitions.

Primary author

Prof. Ida Marena Peruzzi (INFN-LNF)

Presentation materials