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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 A_CP could be measured. For the mixing-induced CP violation S_CP, 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.