Münster 2017 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 52: CP-Verletzung und Mischungswinkel 2
T 52.4: Vortrag
Dienstag, 28. März 2017, 17:30–17:45, JUR 490
Feasibility study of B0 → π0π0 at the Belle II Experiment — •Fernando Abudinen for the Belle II collaboration — Max-Planck-Institut für Physik, München
The measurement of the time-dependent CP violation parameters for the decay channel B0 → π0π0 is crucial for the determination of the unitarity angle φ2.
At former B-factories, only the direct CP violation parameter ACP could be measured. For the mixing-induced CP violation SCP, a time-dependent analysis is required: a highly challenging task because of the small branching fraction around 10−6 and the fact that only a very small fraction of events provide information to reconstruct the B0 vertex. These are events where a π0 decays via the so-called Dalitz decay π0→ e+ e− γ, or where one of the photons from π0→ γ γ converts within the innermost detector material.
With an expected integrated luminosity of about 50 ab−1 at SuperKEKB and the capabilities of the new Pixel Vertex Detector, the Belle II experiment could provide enough statistics to make this measurement feasible. In this work we develop a strategy for the CP violation analysis of B0 → π0π0 in order to exploit maximally the new data set and to characterize the sensitivity of Belle II for this channel.